database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-10-31 15:50:51 +03:00
Code Activity
Files
016bff8adcc2332772b51f8dbdc5a3d926f5a04c
mariadb/sql/sql_parse.cc
tsmith@quadxeon.mysql.com 4b93804592 Merge quadxeon.mysql.com:/benchmarks/ext3/TOSAVE/tsmith/bk/51 
into  quadxeon.mysql.com:/benchmarks/ext3/TOSAVE/tsmith/bk/maint/jun05/51
2007-06-05 17:51:30 +02:00

7129 lines
209 KiB
C++
Raw Blame History

/* Copyright (C) 2000-2003 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#define MYSQL_LEX 1
#include "mysql_priv.h"
#include "sql_repl.h"
#include "rpl_filter.h"
#include "repl_failsafe.h"
#include <m_ctype.h>
#include <myisam.h>
#include <my_dir.h>
#include "sp_head.h"
#include "sp.h"
#include "sp_cache.h"
#include "events.h"
#include "sql_trigger.h"
/* Used in error handling only */
#define SP_TYPE_STRING(LP) \
((LP)->sphead->m_type == TYPE_ENUM_FUNCTION ? "FUNCTION" : "PROCEDURE")
#define SP_COM_STRING(LP) \
((LP)->sql_command == SQLCOM_CREATE_SPFUNCTION || \
(LP)->sql_command == SQLCOM_ALTER_FUNCTION || \
(LP)->sql_command == SQLCOM_SHOW_CREATE_FUNC || \
(LP)->sql_command == SQLCOM_DROP_FUNCTION ? \
"FUNCTION" : "PROCEDURE")
static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables);
static bool check_show_create_table_access(THD *thd, TABLE_LIST *table);
const char *any_db="*any*"; // Special symbol for check_access
const LEX_STRING command_name[]={
{ C_STRING_WITH_LEN("Sleep") },
{ C_STRING_WITH_LEN("Quit") },
{ C_STRING_WITH_LEN("Init DB") },
{ C_STRING_WITH_LEN("Query") },
{ C_STRING_WITH_LEN("Field List") },
{ C_STRING_WITH_LEN("Create DB") },
{ C_STRING_WITH_LEN("Drop DB") },
{ C_STRING_WITH_LEN("Refresh") },
{ C_STRING_WITH_LEN("Shutdown") },
{ C_STRING_WITH_LEN("Statistics") },
{ C_STRING_WITH_LEN("Processlist") },
{ C_STRING_WITH_LEN("Connect") },
{ C_STRING_WITH_LEN("Kill") },
{ C_STRING_WITH_LEN("Debug") },
{ C_STRING_WITH_LEN("Ping") },
{ C_STRING_WITH_LEN("Time") },
{ C_STRING_WITH_LEN("Delayed insert") },
{ C_STRING_WITH_LEN("Change user") },
{ C_STRING_WITH_LEN("Binlog Dump") },
{ C_STRING_WITH_LEN("Table Dump") },
{ C_STRING_WITH_LEN("Connect Out") },
{ C_STRING_WITH_LEN("Register Slave") },
{ C_STRING_WITH_LEN("Prepare") },
{ C_STRING_WITH_LEN("Execute") },
{ C_STRING_WITH_LEN("Long Data") },
{ C_STRING_WITH_LEN("Close stmt") },
{ C_STRING_WITH_LEN("Reset stmt") },
{ C_STRING_WITH_LEN("Set option") },
{ C_STRING_WITH_LEN("Fetch") },
{ C_STRING_WITH_LEN("Daemon") },
{ C_STRING_WITH_LEN("Error") } // Last command number
};
const char *xa_state_names[]={
"NON-EXISTING", "ACTIVE", "IDLE", "PREPARED"
};
static void unlock_locked_tables(THD *thd)
{
if (thd->locked_tables)
{
thd->lock=thd->locked_tables;
thd->locked_tables=0; // Will be automatically closed
close_thread_tables(thd); // Free tables
}
}
bool end_active_trans(THD *thd)
{
int error=0;
DBUG_ENTER("end_active_trans");
if (unlikely(thd->in_sub_stmt))
{
my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
DBUG_RETURN(1);
}
if (thd->transaction.xid_state.xa_state != XA_NOTR)
{
my_error(ER_XAER_RMFAIL, MYF(0),
xa_state_names[thd->transaction.xid_state.xa_state]);
DBUG_RETURN(1);
}
if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN |
OPTION_TABLE_LOCK))
{
DBUG_PRINT("info",("options: 0x%lx", (ulong) thd->options));
/* Safety if one did "drop table" on locked tables */
if (!thd->locked_tables)
thd->options&= ~OPTION_TABLE_LOCK;
thd->server_status&= ~SERVER_STATUS_IN_TRANS;
if (ha_commit(thd))
error=1;
}
thd->options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
thd->no_trans_update.all= FALSE;
DBUG_RETURN(error);
}
bool begin_trans(THD *thd)
{
int error=0;
if (unlikely(thd->in_sub_stmt))
{
my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
return 1;
}
if (thd->locked_tables)
{
thd->lock=thd->locked_tables;
thd->locked_tables=0; // Will be automatically closed
close_thread_tables(thd); // Free tables
}
if (end_active_trans(thd))
error= -1;
else
{
LEX *lex= thd->lex;
thd->options|= OPTION_BEGIN;
thd->server_status|= SERVER_STATUS_IN_TRANS;
if (lex->start_transaction_opt & MYSQL_START_TRANS_OPT_WITH_CONS_SNAPSHOT)
error= ha_start_consistent_snapshot(thd);
}
return error;
}
#ifdef HAVE_REPLICATION
/*
Returns true if all tables should be ignored
*/
inline bool all_tables_not_ok(THD *thd, TABLE_LIST *tables)
{
return rpl_filter->is_on() && tables && !thd->spcont &&
!rpl_filter->tables_ok(thd->db, tables);
}
#endif
static bool some_non_temp_table_to_be_updated(THD *thd, TABLE_LIST *tables)
{
for (TABLE_LIST *table= tables; table; table= table->next_global)
{
DBUG_ASSERT(table->db && table->table_name);
if (table->updating &&
!find_temporary_table(thd, table->db, table->table_name))
return 1;
}
return 0;
}
/*
Mark all commands that somehow changes a table
This is used to check number of updates / hour
sql_command is actually set to SQLCOM_END sometimes
so we need the +1 to include it in the array.
See COMMAND_FLAG_xxx for different type of commands
2 - query that returns meaningful ROW_COUNT() -
a number of modified rows
*/
uint sql_command_flags[SQLCOM_END+1];
void init_update_queries(void)
{
bzero((uchar*) &sql_command_flags, sizeof(sql_command_flags));
sql_command_flags[SQLCOM_CREATE_TABLE]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_CREATE_INDEX]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_ALTER_TABLE]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_TRUNCATE]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_DROP_TABLE]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_LOAD]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_CREATE_DB]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_DROP_DB]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_RENAME_TABLE]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_BACKUP_TABLE]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_RESTORE_TABLE]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_DROP_INDEX]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_CREATE_VIEW]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_DROP_VIEW]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_CREATE_EVENT]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_ALTER_EVENT]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_DROP_EVENT]= CF_CHANGES_DATA;
sql_command_flags[SQLCOM_UPDATE]= CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
sql_command_flags[SQLCOM_UPDATE_MULTI]= CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
sql_command_flags[SQLCOM_INSERT]= CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
sql_command_flags[SQLCOM_INSERT_SELECT]= CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
sql_command_flags[SQLCOM_DELETE]= CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
sql_command_flags[SQLCOM_DELETE_MULTI]= CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
sql_command_flags[SQLCOM_REPLACE]= CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
sql_command_flags[SQLCOM_REPLACE_SELECT]= CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
sql_command_flags[SQLCOM_SHOW_STATUS_PROC]= CF_STATUS_COMMAND;
sql_command_flags[SQLCOM_SHOW_STATUS_FUNC]= CF_STATUS_COMMAND;
sql_command_flags[SQLCOM_SHOW_STATUS]= CF_STATUS_COMMAND;
sql_command_flags[SQLCOM_SHOW_DATABASES]= CF_STATUS_COMMAND;
sql_command_flags[SQLCOM_SHOW_TRIGGERS]= CF_STATUS_COMMAND;
sql_command_flags[SQLCOM_SHOW_EVENTS]= CF_STATUS_COMMAND;
sql_command_flags[SQLCOM_SHOW_OPEN_TABLES]= CF_STATUS_COMMAND;
sql_command_flags[SQLCOM_SHOW_PLUGINS]= CF_STATUS_COMMAND;
sql_command_flags[SQLCOM_SHOW_FIELDS]= CF_STATUS_COMMAND;
sql_command_flags[SQLCOM_SHOW_KEYS]= CF_STATUS_COMMAND;
sql_command_flags[SQLCOM_SHOW_VARIABLES]= CF_STATUS_COMMAND;
sql_command_flags[SQLCOM_SHOW_CHARSETS]= CF_STATUS_COMMAND;
sql_command_flags[SQLCOM_SHOW_COLLATIONS]= CF_STATUS_COMMAND;
sql_command_flags[SQLCOM_SHOW_STATUS_PROC]= CF_STATUS_COMMAND;
sql_command_flags[SQLCOM_SHOW_TABLES]= (CF_STATUS_COMMAND |
CF_SHOW_TABLE_COMMAND);
sql_command_flags[SQLCOM_SHOW_TABLE_STATUS]= (CF_STATUS_COMMAND |
CF_SHOW_TABLE_COMMAND);
/*
The following is used to preserver CF_ROW_COUNT during the
a CALL or EXECUTE statement, so the value generated by the
last called (or executed) statement is preserved.
See mysql_execute_command() for how CF_ROW_COUNT is used.
*/
sql_command_flags[SQLCOM_CALL]= CF_HAS_ROW_COUNT;
sql_command_flags[SQLCOM_EXECUTE]= CF_HAS_ROW_COUNT;
}
bool is_update_query(enum enum_sql_command command)
{
DBUG_ASSERT(command >= 0 && command <= SQLCOM_END);
return (sql_command_flags[command] & CF_CHANGES_DATA) != 0;
}
void execute_init_command(THD *thd, sys_var_str *init_command_var,
rw_lock_t *var_mutex)
{
Vio* save_vio;
ulong save_client_capabilities;
thd->proc_info= "Execution of init_command";
/*
We need to lock init_command_var because
during execution of init_command_var query
values of init_command_var can't be changed
*/
rw_rdlock(var_mutex);
thd->query= init_command_var->value;
thd->query_length= init_command_var->value_length;
save_client_capabilities= thd->client_capabilities;
thd->client_capabilities|= CLIENT_MULTI_QUERIES;
/*
We don't need return result of execution to client side.
To forbid this we should set thd->net.vio to 0.
*/
save_vio= thd->net.vio;
thd->net.vio= 0;
thd->net.no_send_error= 0;
dispatch_command(COM_QUERY, thd, thd->query, thd->query_length+1);
rw_unlock(var_mutex);
thd->client_capabilities= save_client_capabilities;
thd->net.vio= save_vio;
}
/*
Execute commands from bootstrap_file.
Used when creating the initial grant tables
*/
pthread_handler_t handle_bootstrap(void *arg)
{
THD *thd=(THD*) arg;
FILE *file=bootstrap_file;
char *buff;
const char* found_semicolon= NULL;
/* The following must be called before DBUG_ENTER */
thd->thread_stack= (char*) &thd;
if (my_thread_init() || thd->store_globals())
{
#ifndef EMBEDDED_LIBRARY
close_connection(thd, ER_OUT_OF_RESOURCES, 1);
#endif
thd->fatal_error();
goto end;
}
DBUG_ENTER("handle_bootstrap");
#ifndef EMBEDDED_LIBRARY
pthread_detach_this_thread();
thd->thread_stack= (char*) &thd;
#endif /* EMBEDDED_LIBRARY */
if (thd->variables.max_join_size == HA_POS_ERROR)
thd->options |= OPTION_BIG_SELECTS;
thd->proc_info=0;
thd->version=refresh_version;
thd->security_ctx->priv_user=
thd->security_ctx->user= (char*) my_strdup("boot", MYF(MY_WME));
thd->security_ctx->priv_host[0]=0;
/*
Make the "client" handle multiple results. This is necessary
to enable stored procedures with SELECTs and Dynamic SQL
in init-file.
*/
thd->client_capabilities|= CLIENT_MULTI_RESULTS;
buff= (char*) thd->net.buff;
thd->init_for_queries();
while (fgets(buff, thd->net.max_packet, file))
{
/* strlen() can't be deleted because fgets() doesn't return length */
ulong length= (ulong) strlen(buff);
while (buff[length-1] != '\n' && !feof(file))
{
/*
We got only a part of the current string. Will try to increase
net buffer then read the rest of the current string.
*/
/* purecov: begin tested */
if (net_realloc(&(thd->net), 2 * thd->net.max_packet))
{
net_send_error(thd, ER_NET_PACKET_TOO_LARGE, NullS);
thd->fatal_error();
break;
}
buff= (char*) thd->net.buff;
fgets(buff + length, thd->net.max_packet - length, file);
length+= (ulong) strlen(buff + length);
/* purecov: end */
}
if (thd->is_fatal_error)
break; /* purecov: inspected */
while (length && (my_isspace(thd->charset(), buff[length-1]) ||
buff[length-1] == ';'))
length--;
buff[length]=0;
/* Skip lines starting with delimiter */
if (strncmp(buff, STRING_WITH_LEN("delimiter")) == 0)
continue;
thd->query_length=length;
thd->query= (char*) thd->memdup_w_gap(buff, length+1,
thd->db_length+1+
QUERY_CACHE_FLAGS_SIZE);
thd->query[length] = '\0';
DBUG_PRINT("query",("%-.4096s",thd->query));
/*
We don't need to obtain LOCK_thread_count here because in bootstrap
mode we have only one thread.
*/
thd->query_id=next_query_id();
thd->set_time();
mysql_parse(thd, thd->query, length, & found_semicolon);
close_thread_tables(thd); // Free tables
if (thd->is_fatal_error)
break;
if (thd->net.report_error)
{
/* The query failed, send error to log and abort bootstrap */
net_send_error(thd);
thd->fatal_error();
break;
}
free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
#ifdef USING_TRANSACTIONS
free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
#endif
}
end:
/* Remember the exit code of bootstrap */
bootstrap_error= thd->is_fatal_error;
net_end(&thd->net);
thd->cleanup();
delete thd;
#ifndef EMBEDDED_LIBRARY
(void) pthread_mutex_lock(&LOCK_thread_count);
thread_count--;
(void) pthread_mutex_unlock(&LOCK_thread_count);
(void) pthread_cond_broadcast(&COND_thread_count);
my_thread_end();
pthread_exit(0);
#endif
DBUG_RETURN(0);
}
/* This works because items are allocated with sql_alloc() */
void free_items(Item *item)
{
Item *next;
DBUG_ENTER("free_items");
for (; item ; item=next)
{
next=item->next;
item->delete_self();
}
DBUG_VOID_RETURN;
}
/* This works because items are allocated with sql_alloc() */
void cleanup_items(Item *item)
{
DBUG_ENTER("cleanup_items");
for (; item ; item=item->next)
item->cleanup();
DBUG_VOID_RETURN;
}
/*
Handle COM_TABLE_DUMP command
SYNOPSIS
mysql_table_dump
thd thread handle
db database name or an empty string. If empty,
the current database of the connection is used
tbl_name name of the table to dump
NOTES
This function is written to handle one specific command only.
RETURN VALUE
0 success
1 error, the error message is set in THD
*/
static
int mysql_table_dump(THD *thd, LEX_STRING *db, char *tbl_name)
{
TABLE* table;
TABLE_LIST* table_list;
int error = 0;
DBUG_ENTER("mysql_table_dump");
if (db->length == 0)
{
db->str= thd->db; /* purecov: inspected */
db->length= thd->db_length; /* purecov: inspected */
}
if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
DBUG_RETURN(1); // out of memory
table_list->db= db->str;
table_list->table_name= table_list->alias= tbl_name;
table_list->lock_type= TL_READ_NO_INSERT;
table_list->prev_global= &table_list; // can be removed after merge with 4.1
if (check_db_name(db))
{
/* purecov: begin inspected */
my_error(ER_WRONG_DB_NAME ,MYF(0), db->str ? db->str : "NULL");
goto err;
/* purecov: end */
}
if (lower_case_table_names)
my_casedn_str(files_charset_info, tbl_name);
if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT)))
DBUG_RETURN(1);
if (check_one_table_access(thd, SELECT_ACL, table_list))
goto err;
thd->free_list = 0;
thd->query_length=(uint) strlen(tbl_name);
thd->query = tbl_name;
if ((error = mysqld_dump_create_info(thd, table_list, -1)))
{
my_error(ER_GET_ERRNO, MYF(0), my_errno);
goto err;
}
net_flush(&thd->net);
if ((error= table->file->dump(thd,-1)))
my_error(ER_GET_ERRNO, MYF(0), error);
err:
DBUG_RETURN(error);
}
/*
Ends the current transaction and (maybe) begin the next
SYNOPSIS
end_trans()
thd Current thread
completion Completion type
RETURN
0 - OK
*/
int end_trans(THD *thd, enum enum_mysql_completiontype completion)
{
bool do_release= 0;
int res= 0;
DBUG_ENTER("end_trans");
if (unlikely(thd->in_sub_stmt))
{
my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
DBUG_RETURN(1);
}
if (thd->transaction.xid_state.xa_state != XA_NOTR)
{
my_error(ER_XAER_RMFAIL, MYF(0),
xa_state_names[thd->transaction.xid_state.xa_state]);
DBUG_RETURN(1);
}
switch (completion) {
case COMMIT:
/*
We don't use end_active_trans() here to ensure that this works
even if there is a problem with the OPTION_AUTO_COMMIT flag
(Which of course should never happen...)
*/
thd->server_status&= ~SERVER_STATUS_IN_TRANS;
res= ha_commit(thd);
thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_KEEP_LOG);
thd->no_trans_update.all= FALSE;
break;
case COMMIT_RELEASE:
do_release= 1; /* fall through */
case COMMIT_AND_CHAIN:
res= end_active_trans(thd);
if (!res && completion == COMMIT_AND_CHAIN)
res= begin_trans(thd);
break;
case ROLLBACK_RELEASE:
do_release= 1; /* fall through */
case ROLLBACK:
case ROLLBACK_AND_CHAIN:
{
thd->server_status&= ~SERVER_STATUS_IN_TRANS;
if (ha_rollback(thd))
res= -1;
thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_KEEP_LOG);
thd->no_trans_update.all= FALSE;
if (!res && (completion == ROLLBACK_AND_CHAIN))
res= begin_trans(thd);
break;
}
default:
res= -1;
my_error(ER_UNKNOWN_COM_ERROR, MYF(0));
DBUG_RETURN(-1);
}
if (res < 0)
my_error(thd->killed_errno(), MYF(0));
else if ((res == 0) && do_release)
thd->killed= THD::KILL_CONNECTION;
DBUG_RETURN(res);
}
#ifndef EMBEDDED_LIBRARY
/*
Read one command from connection and execute it (query or simple command).
This function is called in loop from thread function.
SYNOPSIS
do_command()
RETURN VALUE
0 success
1 request of thread shutdown (see dispatch_command() description)
*/
bool do_command(THD *thd)
{
char *packet= 0;
ulong packet_length;
NET *net= &thd->net;
enum enum_server_command command;
DBUG_ENTER("do_command");
/*
indicator of uninitialized lex => normal flow of errors handling
(see my_message_sql)
*/
thd->lex->current_select= 0;
/*
This thread will do a blocking read from the client which
will be interrupted when the next command is received from
the client, the connection is closed or "net_wait_timeout"
number of seconds has passed
*/
my_net_set_read_timeout(net, thd->variables.net_wait_timeout);
thd->clear_error(); // Clear error message
net_new_transaction(net);
if ((packet_length=my_net_read(net)) == packet_error)
{
DBUG_PRINT("info",("Got error %d reading command from socket %s",
net->error,
vio_description(net->vio)));
/* Check if we can continue without closing the connection */
if (net->error != 3)
{
statistic_increment(aborted_threads,&LOCK_status);
DBUG_RETURN(TRUE); // We have to close it.
}
net_send_error(thd, net->last_errno, NullS);
net->error= 0;
DBUG_RETURN(FALSE);
}
else
{
packet=(char*) net->read_pos;
command = (enum enum_server_command) (uchar) packet[0];
if (command >= COM_END)
command= COM_END; // Wrong command
DBUG_PRINT("info",("Command on %s = %d (%s)",
vio_description(net->vio), command,
command_name[command].str));
}
/* Restore read timeout value */
my_net_set_read_timeout(net, thd->variables.net_read_timeout);
/*
packet_length contains length of data, as it was stored in packet
header. In case of malformed header, packet_length can be zero.
If packet_length is not zero, my_net_read ensures that this number
of bytes was actually read from network. Additionally my_net_read
sets packet[packet_length]= 0 (thus if packet_length == 0,
command == packet[0] == COM_SLEEP).
In dispatch_command packet[packet_length] points beyond the end of packet.
*/
DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
}
#endif /* EMBEDDED_LIBRARY */
/*
Perform one connection-level (COM_XXXX) command.
SYNOPSIS
dispatch_command()
thd connection handle
command type of command to perform
packet data for the command, packet is always null-terminated
packet_length length of packet + 1 (to show that data is
null-terminated) except for COM_SLEEP, where it
can be zero.
RETURN VALUE
0 ok
1 request of thread shutdown, i. e. if command is
COM_QUIT/COM_SHUTDOWN
*/
bool dispatch_command(enum enum_server_command command, THD *thd,
char* packet, uint packet_length)
{
NET *net= &thd->net;
bool error= 0;
DBUG_ENTER("dispatch_command");
if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
{
thd->killed= THD::NOT_KILLED;
thd->mysys_var->abort= 0;
}
thd->command=command;
/*
Commands which always take a long time are logged into
the slow log only if opt_log_slow_admin_statements is set.
*/
thd->enable_slow_log= TRUE;
thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
thd->set_time();
VOID(pthread_mutex_lock(&LOCK_thread_count));
thd->query_id= global_query_id;
if (command != COM_STATISTICS && command != COM_PING)
next_query_id();
thread_running++;
/* TODO: set thd->lex->sql_command to SQLCOM_END here */
VOID(pthread_mutex_unlock(&LOCK_thread_count));
thd->server_status&=
~(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED);
switch (command) {
case COM_INIT_DB:
{
LEX_STRING tmp;
status_var_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB]);
thd->convert_string(&tmp, system_charset_info,
packet, packet_length-1, thd->charset());
if (!mysql_change_db(thd, &tmp, FALSE))
{
general_log_print(thd, command, "%s",thd->db);
send_ok(thd);
}
break;
}
#ifdef HAVE_REPLICATION
case COM_REGISTER_SLAVE:
{
if (!register_slave(thd, (uchar*)packet, packet_length))
send_ok(thd);
break;
}
#endif
case COM_TABLE_DUMP:
{
char *tbl_name;
LEX_STRING db;
uint db_len= *(uchar*) packet;
if (db_len >= packet_length || db_len > NAME_LEN)
{
my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
break;
}
uint tbl_len= *(uchar*) (packet + db_len + 1);
if (db_len+tbl_len+2 > packet_length || tbl_len > NAME_LEN)
{
my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
break;
}
status_var_increment(thd->status_var.com_other);
thd->enable_slow_log= opt_log_slow_admin_statements;
db.str= (char*) thd->alloc(db_len + tbl_len + 2);
if (!db.str)
{
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
break;
}
db.length= db_len;
tbl_name= strmake(db.str, packet + 1, db_len)+1;
strmake(tbl_name, packet + db_len + 2, tbl_len);
mysql_table_dump(thd, &db, tbl_name);
break;
}
case COM_CHANGE_USER:
{
status_var_increment(thd->status_var.com_other);
char *user= (char*) packet, *packet_end= packet+ packet_length;
char *passwd= strend(user)+1;
thd->change_user();
thd->clear_error(); // if errors from rollback
/*
Old clients send null-terminated string ('\0' for empty string) for
password. New clients send the size (1 byte) + string (not null
terminated, so also '\0' for empty string).
*/
char db_buff[NAME_LEN+1]; // buffer to store db in utf8
char *db= passwd;
char *save_db;
uint passwd_len= (thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
*passwd++ : strlen(passwd));
uint dummy_errors, save_db_length, db_length;
int res;
Security_context save_security_ctx= *thd->security_ctx;
USER_CONN *save_user_connect;
db+= passwd_len + 1;
#ifndef EMBEDDED_LIBRARY
/* Small check for incoming packet */
if ((uint) ((uchar*) db - net->read_pos) > packet_length)
{
my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
break;
}
#endif
/* Convert database name to utf8 */
/*
Handle problem with old bug in client protocol where db had an extra
\0
*/
db_length= (packet_end - db);
if (db_length > 0 && db[db_length-1] == 0)
db_length--;
db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
system_charset_info, db, db_length,
thd->charset(), &dummy_errors)]= 0;
db= db_buff;
/* Save user and privileges */
save_db_length= thd->db_length;
save_db= thd->db;
save_user_connect= thd->user_connect;
if (!(thd->security_ctx->user= my_strdup(user, MYF(0))))
{
thd->security_ctx->user= save_security_ctx.user;
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
break;
}
/* Clear variables that are allocated */
thd->user_connect= 0;
res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
if (res)
{
/* authentication failure, we shall restore old user */
if (res > 0)
my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
else
thd->clear_error(); // Error already sent to client
x_free(thd->security_ctx->user);
*thd->security_ctx= save_security_ctx;
thd->user_connect= save_user_connect;
thd->db= save_db;
thd->db_length= save_db_length;
}
else
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
/* we've authenticated new user */
if (save_user_connect)
decrease_user_connections(save_user_connect);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
x_free((uchar*) save_db);
x_free((uchar*) save_security_ctx.user);
}
break;
}
case COM_STMT_EXECUTE:
{
mysql_stmt_execute(thd, packet, packet_length);
break;
}
case COM_STMT_FETCH:
{
mysql_stmt_fetch(thd, packet, packet_length);
break;
}
case COM_STMT_SEND_LONG_DATA:
{
mysql_stmt_get_longdata(thd, packet, packet_length);
break;
}
case COM_STMT_PREPARE:
{
mysql_stmt_prepare(thd, packet, packet_length);
break;
}
case COM_STMT_CLOSE:
{
mysql_stmt_close(thd, packet);
break;
}
case COM_STMT_RESET:
{
mysql_stmt_reset(thd, packet);
break;
}
case COM_QUERY:
{
if (alloc_query(thd, packet, packet_length))
break; // fatal error is set
char *packet_end= thd->query + thd->query_length;
/* 'b' stands for 'buffer' parameter', special for 'my_snprintf' */
const char *format= "%.*b";
const char* found_semicolon= NULL;
general_log_print(thd, command, format, thd->query_length, thd->query);
DBUG_PRINT("query",("%-.4096s",thd->query));
if (!(specialflag & SPECIAL_NO_PRIOR))
my_pthread_setprio(pthread_self(),QUERY_PRIOR);
mysql_parse(thd, thd->query, thd->query_length, & found_semicolon);
while (!thd->killed && found_semicolon && !thd->net.report_error)
{
char *next_packet= (char*) found_semicolon;
net->no_send_error= 0;
/*
Multiple queries exits, execute them individually
*/
if (thd->lock || thd->open_tables || thd->derived_tables ||
thd->prelocked_mode)
close_thread_tables(thd);
ulong length= (ulong)(packet_end - next_packet);
log_slow_statement(thd);
/* Remove garbage at start of query */
while (my_isspace(thd->charset(), *next_packet) && length > 0)
{
next_packet++;
length--;
}
VOID(pthread_mutex_lock(&LOCK_thread_count));
thd->query_length= length;
thd->query= next_packet;
thd->query_id= next_query_id();
thd->set_time(); /* Reset the query start time. */
/* TODO: set thd->lex->sql_command to SQLCOM_END here */
VOID(pthread_mutex_unlock(&LOCK_thread_count));
mysql_parse(thd, next_packet, length, & found_semicolon);
}
if (!(specialflag & SPECIAL_NO_PRIOR))
my_pthread_setprio(pthread_self(),WAIT_PRIOR);
DBUG_PRINT("info",("query ready"));
break;
}
case COM_FIELD_LIST: // This isn't actually needed
#ifdef DONT_ALLOW_SHOW_COMMANDS
my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
MYF(0)); /* purecov: inspected */
break;
#else
{
char *fields, *packet_end= packet + packet_length - 1, *arg_end;
/* Locked closure of all tables */
TABLE_LIST table_list;
LEX_STRING conv_name;
size_t dummy;
/* used as fields initializator */
lex_start(thd);
status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS]);
bzero((char*) &table_list,sizeof(table_list));
if (thd->copy_db_to(&table_list.db, &dummy))
break;
/*
We have name + wildcard in packet, separated by endzero
*/
arg_end= strend(packet);
thd->convert_string(&conv_name, system_charset_info,
packet, (uint) (arg_end - packet), thd->charset());
table_list.alias= table_list.table_name= conv_name.str;
packet= arg_end + 1;
if (!my_strcasecmp(system_charset_info, table_list.db,
INFORMATION_SCHEMA_NAME.str))
{
ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, table_list.alias);
if (schema_table)
table_list.schema_table= schema_table;
}
thd->query_length= (uint) (packet_end - packet); // Don't count end \0
if (!(thd->query=fields= (char*) thd->memdup(packet,thd->query_length+1)))
break;
general_log_print(thd, command, "%s %s", table_list.table_name, fields);
if (lower_case_table_names)
my_casedn_str(files_charset_info, table_list.table_name);
if (check_access(thd,SELECT_ACL,table_list.db,&table_list.grant.privilege,
0, 0, test(table_list.schema_table)))
break;
if (check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0))
break;
/* init structures for VIEW processing */
table_list.select_lex= &(thd->lex->select_lex);
lex_start(thd);
mysql_reset_thd_for_next_command(thd);
thd->lex->
select_lex.table_list.link_in_list((uchar*) &table_list,
(uchar**) &table_list.next_local);
thd->lex->add_to_query_tables(&table_list);
/* switch on VIEW optimisation: do not fill temporary tables */
thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
mysqld_list_fields(thd,&table_list,fields);
thd->lex->unit.cleanup();
thd->cleanup_after_query();
break;
}
#endif
case COM_QUIT:
/* We don't calculate statistics for this command */
general_log_print(thd, command, NullS);
net->error=0; // Don't give 'abort' message
error=TRUE; // End server
break;
#ifdef REMOVED
case COM_CREATE_DB: // QQ: To be removed
{
LEX_STRING db, alias;
HA_CREATE_INFO create_info;
status_var_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB]);
if (thd->LEX_STRING_make(&db, packet, packet_length -1) ||
thd->LEX_STRING_make(&alias, db.str, db.length) ||
check_db_name(&db))
{
my_error(ER_WRONG_DB_NAME, MYF(0), db.str ? db.str : "NULL");
break;
}
if (check_access(thd, CREATE_ACL, db.str , 0, 1, 0,
is_schema_db(db.str)))
break;
general_log_print(thd, command, packet);
bzero(&create_info, sizeof(create_info));
mysql_create_db(thd, (lower_case_table_names == 2 ? alias.str : db.str),
&create_info, 0);
break;
}
case COM_DROP_DB: // QQ: To be removed
{
status_var_increment(thd->status_var.com_stat[SQLCOM_DROP_DB]);
LEX_STRING db;
if (thd->LEX_STRING_make(&db, packet, packet_length - 1) ||
check_db_name(&db))
{
my_error(ER_WRONG_DB_NAME, MYF(0), db.str ? db.str : "NULL");
break;
}
if (check_access(thd, DROP_ACL, db.str, 0, 1, 0, is_schema_db(db.str)))
break;
if (thd->locked_tables || thd->active_transaction())
{
my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
break;
}
general_log_print(thd, command, db.str);
mysql_rm_db(thd, db.str, 0, 0);
break;
}
#endif
#ifndef EMBEDDED_LIBRARY
case COM_BINLOG_DUMP:
{
ulong pos;
ushort flags;
uint32 slave_server_id;
status_var_increment(thd->status_var.com_other);
thd->enable_slow_log= opt_log_slow_admin_statements;
if (check_global_access(thd, REPL_SLAVE_ACL))
break;
/* TODO: The following has to be changed to an 8 byte integer */
pos = uint4korr(packet);
flags = uint2korr(packet + 4);
thd->server_id=0; /* avoid suicide */
if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
kill_zombie_dump_threads(slave_server_id);
thd->server_id = slave_server_id;
general_log_print(thd, command, "Log: '%s' Pos: %ld", packet+10,
(long) pos);
mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
unregister_slave(thd,1,1);
/* fake COM_QUIT -- if we get here, the thread needs to terminate */
error = TRUE;
net->error = 0;
break;
}
#endif
case COM_REFRESH:
{
bool not_used;
status_var_increment(thd->status_var.com_stat[SQLCOM_FLUSH]);
ulong options= (ulong) (uchar) packet[0];
if (check_global_access(thd,RELOAD_ACL))
break;
general_log_print(thd, command, NullS);
if (!reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, &not_used))
send_ok(thd);
break;
}
#ifndef EMBEDDED_LIBRARY
case COM_SHUTDOWN:
{
status_var_increment(thd->status_var.com_other);
if (check_global_access(thd,SHUTDOWN_ACL))
break; /* purecov: inspected */
/*
If the client is < 4.1.3, it is going to send us no argument; then
packet_length is 1, packet[0] is the end 0 of the packet. Note that
SHUTDOWN_DEFAULT is 0. If client is >= 4.1.3, the shutdown level is in
packet[0].
*/
enum mysql_enum_shutdown_level level=
(enum mysql_enum_shutdown_level) (uchar) packet[0];
if (level == SHUTDOWN_DEFAULT)
level= SHUTDOWN_WAIT_ALL_BUFFERS; // soon default will be configurable
else if (level != SHUTDOWN_WAIT_ALL_BUFFERS)
{
my_error(ER_NOT_SUPPORTED_YET, MYF(0), "this shutdown level");
break;
}
DBUG_PRINT("quit",("Got shutdown command for level %u", level));
general_log_print(thd, command, NullS);
send_eof(thd);
#ifdef __WIN__
sleep(1); // must wait after eof()
#endif
/*
The client is next going to send a COM_QUIT request (as part of
mysql_close()). Make the life simpler for the client by sending
the response for the coming COM_QUIT in advance
*/
send_eof(thd);
close_connection(thd, 0, 1);
close_thread_tables(thd); // Free before kill
kill_mysql();
error=TRUE;
break;
}
#endif
case COM_STATISTICS:
{
STATUS_VAR current_global_status_var;
ulong uptime;
uint length;
ulonglong queries_per_second1000;
#ifndef EMBEDDED_LIBRARY
char buff[250];
uint buff_len= sizeof(buff);
#else
char *buff= thd->net.last_error;
uint buff_len= sizeof(thd->net.last_error);
#endif
general_log_print(thd, command, NullS);
status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS]);
calc_sum_of_all_status(&current_global_status_var);
if (!(uptime= (ulong) (thd->start_time - server_start_time)))
queries_per_second1000= 0;
else
queries_per_second1000= thd->query_id * LL(1000) / uptime;
length= my_snprintf((char*) buff, buff_len - 1,
"Uptime: %lu Threads: %d Questions: %lu "
"Slow queries: %lu Opens: %lu Flush tables: %lu "
"Open tables: %u Queries per second avg: %u.%u",
uptime,
(int) thread_count, (ulong) thd->query_id,
current_global_status_var.long_query_count,
current_global_status_var.opened_tables,
refresh_version,
cached_open_tables(),
(uint) (queries_per_second1000 / 1000),
(uint) (queries_per_second1000 % 1000));
#ifdef SAFEMALLOC
if (sf_malloc_cur_memory) // Using SAFEMALLOC
{
char *end= buff + length;
length+= my_snprintf(end, buff_len - length - 1,
end," Memory in use: %ldK Max memory used: %ldK",
(sf_malloc_cur_memory+1023L)/1024L,
(sf_malloc_max_memory+1023L)/1024L);
}
#endif
#ifndef EMBEDDED_LIBRARY
VOID(my_net_write(net, (uchar*) buff, length));
VOID(net_flush(net));
#endif
break;
}
case COM_PING:
status_var_increment(thd->status_var.com_other);
send_ok(thd); // Tell client we are alive
break;
case COM_PROCESS_INFO:
status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST]);
if (!thd->security_ctx->priv_user[0] &&
check_global_access(thd, PROCESS_ACL))
break;
general_log_print(thd, command, NullS);
mysqld_list_processes(thd,
thd->security_ctx->master_access & PROCESS_ACL ?
NullS : thd->security_ctx->priv_user, 0);
break;
case COM_PROCESS_KILL:
{
status_var_increment(thd->status_var.com_stat[SQLCOM_KILL]);
ulong id=(ulong) uint4korr(packet);
sql_kill(thd,id,false);
break;
}
case COM_SET_OPTION:
{
status_var_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION]);
uint opt_command= uint2korr(packet);
switch (opt_command) {
case (int) MYSQL_OPTION_MULTI_STATEMENTS_ON:
thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
send_eof(thd);
break;
case (int) MYSQL_OPTION_MULTI_STATEMENTS_OFF:
thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
send_eof(thd);
break;
default:
my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
break;
}
break;
}
case COM_DEBUG:
status_var_increment(thd->status_var.com_other);
if (check_global_access(thd, SUPER_ACL))
break; /* purecov: inspected */
mysql_print_status();
general_log_print(thd, command, NullS);
send_eof(thd);
break;
case COM_SLEEP:
case COM_CONNECT: // Impossible here
case COM_TIME: // Impossible from client
case COM_DELAYED_INSERT:
case COM_END:
default:
my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
break;
}
if (thd->lock || thd->open_tables || thd->derived_tables ||
thd->prelocked_mode)
{
thd->proc_info="closing tables";
close_thread_tables(thd); /* Free tables */
}
/*
assume handlers auto-commit (if some doesn't - transaction handling
in MySQL should be redesigned to support it; it's a big change,
and it's not worth it - better to commit explicitly only writing
transactions, read-only ones should better take care of themselves.
saves some work in 2pc too)
see also sql_base.cc - close_thread_tables()
*/
bzero(&thd->transaction.stmt, sizeof(thd->transaction.stmt));
if (!thd->active_transaction())
thd->transaction.xid_state.xid.null();
/* report error issued during command execution */
if (thd->killed_errno() && !thd->net.report_error)
thd->send_kill_message();
if (thd->net.report_error)
net_send_error(thd);
log_slow_statement(thd);
thd->proc_info="cleaning up";
VOID(pthread_mutex_lock(&LOCK_thread_count)); // For process list
thd->proc_info=0;
thd->command=COM_SLEEP;
thd->query=0;
thd->query_length=0;
thread_running--;
VOID(pthread_mutex_unlock(&LOCK_thread_count));
thd->packet.shrink(thd->variables.net_buffer_length); // Reclaim some memory
free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
DBUG_RETURN(error);
}
void log_slow_statement(THD *thd)
{
time_t start_of_query;
DBUG_ENTER("log_slow_statement");
/*
The following should never be true with our current code base,
but better to keep this here so we don't accidently try to log a
statement in a trigger or stored function
*/
if (unlikely(thd->in_sub_stmt))
DBUG_VOID_RETURN; // Don't set time for sub stmt
start_of_query= thd->start_time;
thd->end_time(); // Set start time
/*
Do not log administrative statements unless the appropriate option is
set; do not log into slow log if reading from backup.
*/
if (thd->enable_slow_log && !thd->user_time)
{
thd->proc_info="logging slow query";
if ((ulong) (thd->start_time - thd->time_after_lock) >
thd->variables.long_query_time ||
((thd->server_status &
(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
(specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
{
thd->status_var.long_query_count++;
slow_log_print(thd, thd->query, thd->query_length, start_of_query);
}
}
DBUG_VOID_RETURN;
}
/*
Create a TABLE_LIST object for an INFORMATION_SCHEMA table.
SYNOPSIS
prepare_schema_table()
thd thread handle
lex current lex
table_ident table alias if it's used
schema_table_idx the type of the INFORMATION_SCHEMA table to be
created
DESCRIPTION
This function is used in the parser to convert a SHOW or DESCRIBE
table_name command to a SELECT from INFORMATION_SCHEMA.
It prepares a SELECT_LEX and a TABLE_LIST object to represent the
given command as a SELECT parse tree.
NOTES
Due to the way this function works with memory and LEX it cannot
be used outside the parser (parse tree transformations outside
the parser break PS and SP).
RETURN VALUE
0 success
1 out of memory or SHOW commands are not allowed
in this version of the server.
*/
int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident,
enum enum_schema_tables schema_table_idx)
{
SELECT_LEX *schema_select_lex= NULL;
DBUG_ENTER("prepare_schema_table");
switch (schema_table_idx) {
case SCH_SCHEMATA:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
my_message(ER_NOT_ALLOWED_COMMAND,
ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
DBUG_RETURN(1);
#else
break;
#endif
case SCH_TABLE_NAMES:
case SCH_TABLES:
case SCH_VIEWS:
case SCH_TRIGGERS:
case SCH_EVENTS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
my_message(ER_NOT_ALLOWED_COMMAND,
ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
DBUG_RETURN(1);
#else
{
LEX_STRING db;
size_t dummy;
if (lex->select_lex.db == NULL &&
thd->copy_db_to(&lex->select_lex.db, &dummy))
{
DBUG_RETURN(1);
}
schema_select_lex= new SELECT_LEX();
db.str= schema_select_lex->db= lex->select_lex.db;
schema_select_lex->table_list.first= NULL;
db.length= strlen(db.str);
if (check_db_name(&db))
{
my_error(ER_WRONG_DB_NAME, MYF(0), db.str);
DBUG_RETURN(1);
}
break;
}
#endif
case SCH_COLUMNS:
case SCH_STATISTICS:
{
#ifdef DONT_ALLOW_SHOW_COMMANDS
my_message(ER_NOT_ALLOWED_COMMAND,
ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
DBUG_RETURN(1);
#else
DBUG_ASSERT(table_ident);
TABLE_LIST **query_tables_last= lex->query_tables_last;
schema_select_lex= new SELECT_LEX();
/* 'parent_lex' is used in init_query() so it must be before it. */
schema_select_lex->parent_lex= lex;
schema_select_lex->init_query();
if (!schema_select_lex->add_table_to_list(thd, table_ident, 0, 0, TL_READ))
DBUG_RETURN(1);
lex->query_tables_last= query_tables_last;
break;
}
#endif
case SCH_OPEN_TABLES:
case SCH_VARIABLES:
case SCH_STATUS:
case SCH_PROCEDURES:
case SCH_CHARSETS:
case SCH_ENGINES:
case SCH_COLLATIONS:
case SCH_COLLATION_CHARACTER_SET_APPLICABILITY:
case SCH_USER_PRIVILEGES:
case SCH_SCHEMA_PRIVILEGES:
case SCH_TABLE_PRIVILEGES:
case SCH_COLUMN_PRIVILEGES:
case SCH_TABLE_CONSTRAINTS:
case SCH_KEY_COLUMN_USAGE:
default:
break;
}
SELECT_LEX *select_lex= lex->current_select;
if (make_schema_select(thd, select_lex, schema_table_idx))
{
DBUG_RETURN(1);
}
TABLE_LIST *table_list= (TABLE_LIST*) select_lex->table_list.first;
table_list->schema_select_lex= schema_select_lex;
table_list->schema_table_reformed= 1;
DBUG_RETURN(0);
}
/*
Read query from packet and store in thd->query
Used in COM_QUERY and COM_STMT_PREPARE
DESCRIPTION
Sets the following THD variables:
query
query_length
RETURN VALUES
FALSE ok
TRUE error; In this case thd->fatal_error is set
*/
bool alloc_query(THD *thd, const char *packet, uint packet_length)
{
packet_length--; // Remove end null
/* Remove garbage at start and end of query */
while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
{
packet++;
packet_length--;
}
const char *pos= packet + packet_length; // Point at end null
while (packet_length > 0 &&
(pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
{
pos--;
packet_length--;
}
/* We must allocate some extra memory for query cache */
thd->query_length= 0; // Extra safety: Avoid races
if (!(thd->query= (char*) thd->memdup_w_gap((uchar*) (packet),
packet_length,
thd->db_length+ 1 +
QUERY_CACHE_FLAGS_SIZE)))
return TRUE;
thd->query[packet_length]=0;
thd->query_length= packet_length;
/* Reclaim some memory */
thd->packet.shrink(thd->variables.net_buffer_length);
thd->convert_buffer.shrink(thd->variables.net_buffer_length);
return FALSE;
}
static void reset_one_shot_variables(THD *thd)
{
thd->variables.character_set_client=
global_system_variables.character_set_client;
thd->variables.collation_connection=
global_system_variables.collation_connection;
thd->variables.collation_database=
global_system_variables.collation_database;
thd->variables.collation_server=
global_system_variables.collation_server;
thd->update_charset();
thd->variables.time_zone=
global_system_variables.time_zone;
thd->variables.lc_time_names= &my_locale_en_US;
thd->one_shot_set= 0;
}
static
bool sp_process_definer(THD *thd)
{
DBUG_ENTER("sp_process_definer");
LEX *lex= thd->lex;
/*
If the definer is not specified, this means that CREATE-statement missed
DEFINER-clause. DEFINER-clause can be missed in two cases:
- The user submitted a statement w/o the clause. This is a normal
case, we should assign CURRENT_USER as definer.
- Our slave received an updated from the master, that does not
replicate definer for stored rountines. We should also assign
CURRENT_USER as definer here, but also we should mark this routine
as NON-SUID. This is essential for the sake of backward
compatibility.
The problem is the slave thread is running under "special" user (@),
that actually does not exist. In the older versions we do not fail
execution of a stored routine if its definer does not exist and
continue the execution under the authorization of the invoker
(BUG#13198). And now if we try to switch to slave-current-user (@),
we will fail.
Actually, this leads to the inconsistent state of master and
slave (different definers, different SUID behaviour), but it seems,
this is the best we can do.
*/
if (!lex->definer)
{
Query_arena original_arena;
Query_arena *ps_arena= thd->activate_stmt_arena_if_needed(&original_arena);
lex->definer= create_default_definer(thd);
if (ps_arena)
thd->restore_active_arena(ps_arena, &original_arena);
/* Error has been already reported. */
if (lex->definer == NULL)
DBUG_RETURN(TRUE);
if (thd->slave_thread)
lex->sphead->m_chistics->suid= SP_IS_NOT_SUID;
}
else
{
/*
If the specified definer differs from the current user, we
should check that the current user has SUPER privilege (in order
to create a stored routine under another user one must have
SUPER privilege).
*/
if ((strcmp(lex->definer->user.str, thd->security_ctx->priv_user) ||
my_strcasecmp(system_charset_info, lex->definer->host.str,
thd->security_ctx->priv_host)) &&
check_global_access(thd, SUPER_ACL))
{
my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER");
DBUG_RETURN(TRUE);
}
}
/* Check that the specified definer exists. Emit a warning if not. */
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (!is_acl_user(lex->definer->host.str, lex->definer->user.str))
{
push_warning_printf(thd,
MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_NO_SUCH_USER,
ER(ER_NO_SUCH_USER),
lex->definer->user.str,
lex->definer->host.str);
}
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
DBUG_RETURN(FALSE);
}
/*
Execute command saved in thd and lex->sql_command
SYNOPSIS
mysql_execute_command()
thd Thread handle
IMPLEMENTATION
Before every operation that can request a write lock for a table
wait if a global read lock exists. However do not wait if this
thread has locked tables already. No new locks can be requested
until the other locks are released. The thread that requests the
global read lock waits for write locked tables to become unlocked.
Note that wait_if_global_read_lock() sets a protection against a new
global read lock when it succeeds. This needs to be released by
start_waiting_global_read_lock() after the operation.
RETURN
FALSE OK
TRUE Error
*/
bool
mysql_execute_command(THD *thd)
{
bool res= FALSE;
bool need_start_waiting= FALSE; // have protection against global read lock
int up_result= 0;
LEX *lex= thd->lex;
/* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */
SELECT_LEX *select_lex= &lex->select_lex;
/* first table of first SELECT_LEX */
TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first;
/* list of all tables in query */
TABLE_LIST *all_tables;
/* most outer SELECT_LEX_UNIT of query */
SELECT_LEX_UNIT *unit= &lex->unit;
/* Saved variable value */
DBUG_ENTER("mysql_execute_command");
thd->net.no_send_error= 0;
#ifdef WITH_PARTITION_STORAGE_ENGINE
thd->work_part_info= 0;
#endif
/*
In many cases first table of main SELECT_LEX have special meaning =>
check that it is first table in global list and relink it first in
queries_tables list if it is necessary (we need such relinking only
for queries with subqueries in select list, in this case tables of
subqueries will go to global list first)
all_tables will differ from first_table only if most upper SELECT_LEX
do not contain tables.
Because of above in place where should be at least one table in most
outer SELECT_LEX we have following check:
DBUG_ASSERT(first_table == all_tables);
DBUG_ASSERT(first_table == all_tables && first_table != 0);
*/
lex->first_lists_tables_same();
/* should be assigned after making first tables same */
all_tables= lex->query_tables;
/* set context for commands which do not use setup_tables */
select_lex->
context.resolve_in_table_list_only((TABLE_LIST*)select_lex->
table_list.first);
/*
Reset warning count for each query that uses tables
A better approach would be to reset this for any commands
that is not a SHOW command or a select that only access local
variables, but for now this is probably good enough.
Don't reset warnings when executing a stored routine.
*/
if ((all_tables || &lex->select_lex != lex->all_selects_list ||
lex->sroutines.records) && !thd->spcont)
mysql_reset_errors(thd, 0);
#ifdef HAVE_REPLICATION
if (unlikely(thd->slave_thread))
{
if (lex->sql_command == SQLCOM_DROP_TRIGGER)
{
/*
When dropping a trigger, we need to load its table name
before checking slave filter rules.
*/
add_table_for_trigger(thd, thd->lex->spname, 1, &all_tables);
if (!all_tables)
{
/*
If table name cannot be loaded,
it means the trigger does not exists possibly because
CREATE TRIGGER was previously skipped for this trigger
according to slave filtering rules.
Returning success without producing any errors in this case.
*/
DBUG_RETURN(0);
}
// force searching in slave.cc:tables_ok()
all_tables->updating= 1;
}
/*
Check if statment should be skipped because of slave filtering
rules
Exceptions are:
- UPDATE MULTI: For this statement, we want to check the filtering
rules later in the code
- SET: we always execute it (Not that many SET commands exists in
the binary log anyway -- only 4.1 masters write SET statements,
in 5.0 there are no SET statements in the binary log)
- DROP TEMPORARY TABLE IF EXISTS: we always execute it (otherwise we
have stale files on slave caused by exclusion of one tmp table).
*/
if (!(lex->sql_command == SQLCOM_UPDATE_MULTI) &&
!(lex->sql_command == SQLCOM_SET_OPTION) &&
!(lex->sql_command == SQLCOM_DROP_TABLE &&
lex->drop_temporary && lex->drop_if_exists) &&
all_tables_not_ok(thd, all_tables))
{
/* we warn the slave SQL thread */
my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
if (thd->one_shot_set)
{
/*
It's ok to check thd->one_shot_set here:
The charsets in a MySQL 5.0 slave can change by both a binlogged
SET ONE_SHOT statement and the event-internal charset setting,
and these two ways to change charsets do not seems to work
together.
At least there seems to be problems in the rli cache for
charsets if we are using ONE_SHOT. Note that this is normally no
problem because either the >= 5.0 slave reads a 4.1 binlog (with
ONE_SHOT) *or* or 5.0 binlog (without ONE_SHOT) but never both."
*/
reset_one_shot_variables(thd);
}
DBUG_RETURN(0);
}
}
else
{
#endif /* HAVE_REPLICATION */
/*
When option readonly is set deny operations which change non-temporary
tables. Except for the replication thread and the 'super' users.
*/
if (opt_readonly &&
!(thd->security_ctx->master_access & SUPER_ACL) &&
(sql_command_flags[lex->sql_command] & CF_CHANGES_DATA) &&
!((lex->sql_command == SQLCOM_CREATE_TABLE) &&
(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)) &&
!((lex->sql_command == SQLCOM_DROP_TABLE) && lex->drop_temporary) &&
((lex->sql_command != SQLCOM_UPDATE_MULTI) &&
some_non_temp_table_to_be_updated(thd, all_tables)))
{
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
DBUG_RETURN(-1);
}
#ifdef HAVE_REPLICATION
} /* endif unlikely slave */
#endif
status_var_increment(thd->status_var.com_stat[lex->sql_command]);
switch (lex->sql_command) {
case SQLCOM_SHOW_EVENTS:
if ((res= check_access(thd, EVENT_ACL, thd->lex->select_lex.db, 0, 0, 0,
is_schema_db(thd->lex->select_lex.db))))
break;
/* fall through */
case SQLCOM_SHOW_STATUS_PROC:
case SQLCOM_SHOW_STATUS_FUNC:
res= execute_sqlcom_select(thd, all_tables);
break;
case SQLCOM_SHOW_STATUS:
{
system_status_var old_status_var= thd->status_var;
thd->initial_status_var= &old_status_var;
res= execute_sqlcom_select(thd, all_tables);
/* Don't log SHOW STATUS commands to slow query log */
thd->server_status&= ~(SERVER_QUERY_NO_INDEX_USED |
SERVER_QUERY_NO_GOOD_INDEX_USED);
/*
restore status variables, as we don't want 'show status' to cause
changes
*/
pthread_mutex_lock(&LOCK_status);
add_diff_to_status(&global_status_var, &thd->status_var,
&old_status_var);
thd->status_var= old_status_var;
pthread_mutex_unlock(&LOCK_status);
break;
}
case SQLCOM_SHOW_DATABASES:
case SQLCOM_SHOW_TABLES:
case SQLCOM_SHOW_TRIGGERS:
case SQLCOM_SHOW_TABLE_STATUS:
case SQLCOM_SHOW_OPEN_TABLES:
case SQLCOM_SHOW_PLUGINS:
case SQLCOM_SHOW_FIELDS:
case SQLCOM_SHOW_KEYS:
case SQLCOM_SHOW_VARIABLES:
case SQLCOM_SHOW_CHARSETS:
case SQLCOM_SHOW_COLLATIONS:
case SQLCOM_SELECT:
thd->status_var.last_query_cost= 0.0;
if (all_tables)
{
res= check_table_access(thd,
lex->exchange ? SELECT_ACL | FILE_ACL :
SELECT_ACL,
all_tables, 0);
}
else
res= check_access(thd,
lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
any_db, 0, 0, 0, 0);
if (!res)
res= execute_sqlcom_select(thd, all_tables);
break;
case SQLCOM_PREPARE:
{
mysql_sql_stmt_prepare(thd);
break;
}
case SQLCOM_EXECUTE:
{
mysql_sql_stmt_execute(thd);
break;
}
case SQLCOM_DEALLOCATE_PREPARE:
{
mysql_sql_stmt_close(thd);
break;
}
case SQLCOM_DO:
if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
open_and_lock_tables(thd, all_tables))
goto error;
res= mysql_do(thd, *lex->insert_list);
break;
case SQLCOM_EMPTY_QUERY:
send_ok(thd);
break;
case SQLCOM_HELP:
res= mysqld_help(thd,lex->help_arg);
break;
#ifndef EMBEDDED_LIBRARY
case SQLCOM_PURGE:
{
if (check_global_access(thd, SUPER_ACL))
goto error;
/* PURGE MASTER LOGS TO 'file' */
res = purge_master_logs(thd, lex->to_log);
break;
}
case SQLCOM_PURGE_BEFORE:
{
Item *it;
if (check_global_access(thd, SUPER_ACL))
goto error;
/* PURGE MASTER LOGS BEFORE 'data' */
it= (Item *)lex->value_list.head();
if ((!it->fixed && it->fix_fields(lex->thd, &it)) ||
it->check_cols(1))
{
my_error(ER_WRONG_ARGUMENTS, MYF(0), "PURGE LOGS BEFORE");
goto error;
}
it= new Item_func_unix_timestamp(it);
/*
it is OK only emulate fix_fieds, because we need only
value of constant
*/
it->quick_fix_field();
res = purge_master_logs_before_date(thd, (ulong)it->val_int());
break;
}
#endif
case SQLCOM_SHOW_WARNS:
{
res= mysqld_show_warnings(thd, (ulong)
((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
(1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
(1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
));
break;
}
case SQLCOM_SHOW_ERRORS:
{
res= mysqld_show_warnings(thd, (ulong)
(1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
break;
}
case SQLCOM_SHOW_NEW_MASTER:
{
if (check_global_access(thd, REPL_SLAVE_ACL))
goto error;
/* This query don't work now. See comment in repl_failsafe.cc */
#ifndef WORKING_NEW_MASTER
my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER");
goto error;
#else
res = show_new_master(thd);
break;
#endif
}
#ifdef HAVE_REPLICATION
case SQLCOM_SHOW_SLAVE_HOSTS:
{
if (check_global_access(thd, REPL_SLAVE_ACL))
goto error;
res = show_slave_hosts(thd);
break;
}
case SQLCOM_SHOW_BINLOG_EVENTS:
{
if (check_global_access(thd, REPL_SLAVE_ACL))
goto error;
res = mysql_show_binlog_events(thd);
break;
}
#endif
case SQLCOM_BACKUP_TABLE:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
check_global_access(thd, FILE_ACL))
goto error; /* purecov: inspected */
thd->enable_slow_log= opt_log_slow_admin_statements;
res = mysql_backup_table(thd, first_table);
select_lex->table_list.first= (uchar*) first_table;
lex->query_tables=all_tables;
break;
}
case SQLCOM_RESTORE_TABLE:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if (check_table_access(thd, INSERT_ACL, all_tables, 0) ||
check_global_access(thd, FILE_ACL))
goto error; /* purecov: inspected */
thd->enable_slow_log= opt_log_slow_admin_statements;
res = mysql_restore_table(thd, first_table);
select_lex->table_list.first= (uchar*) first_table;
lex->query_tables=all_tables;
break;
}
case SQLCOM_ASSIGN_TO_KEYCACHE:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if (check_access(thd, INDEX_ACL, first_table->db,
&first_table->grant.privilege, 0, 0,
test(first_table->schema_table)))
goto error;
res= mysql_assign_to_keycache(thd, first_table, &lex->ident);
break;
}
case SQLCOM_PRELOAD_KEYS:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if (check_access(thd, INDEX_ACL, first_table->db,
&first_table->grant.privilege, 0, 0,
test(first_table->schema_table)))
goto error;
res = mysql_preload_keys(thd, first_table);
break;
}
#ifdef HAVE_REPLICATION
case SQLCOM_CHANGE_MASTER:
{
if (check_global_access(thd, SUPER_ACL))
goto error;
pthread_mutex_lock(&LOCK_active_mi);
res = change_master(thd,active_mi);
pthread_mutex_unlock(&LOCK_active_mi);
break;
}
case SQLCOM_SHOW_SLAVE_STAT:
{
/* Accept one of two privileges */
if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
goto error;
pthread_mutex_lock(&LOCK_active_mi);
res = show_master_info(thd,active_mi);
pthread_mutex_unlock(&LOCK_active_mi);
break;
}
case SQLCOM_SHOW_MASTER_STAT:
{
/* Accept one of two privileges */
if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
goto error;
res = show_binlog_info(thd);
break;
}
case SQLCOM_LOAD_MASTER_DATA: // sync with master
if (check_global_access(thd, SUPER_ACL))
goto error;
if (end_active_trans(thd))
goto error;
res = load_master_data(thd);
break;
#endif /* HAVE_REPLICATION */
case SQLCOM_SHOW_ENGINE_STATUS:
{
if (check_global_access(thd, SUPER_ACL))
goto error;
res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_STATUS);
break;
}
case SQLCOM_SHOW_ENGINE_MUTEX:
{
if (check_global_access(thd, SUPER_ACL))
goto error;
res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_MUTEX);
break;
}
#ifdef HAVE_REPLICATION
case SQLCOM_LOAD_MASTER_TABLE:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
DBUG_ASSERT(first_table->db); /* Must be set in the parser */
if (check_access(thd, CREATE_ACL, first_table->db,
&first_table->grant.privilege, 0, 0,
test(first_table->schema_table)))
goto error; /* purecov: inspected */
/* Check that the first table has CREATE privilege */
if (check_grant(thd, CREATE_ACL, all_tables, 0, 1, 0))
goto error;
pthread_mutex_lock(&LOCK_active_mi);
/*
fetch_master_table will send the error to the client on failure.
Give error if the table already exists.
*/
if (!fetch_master_table(thd, first_table->db, first_table->table_name,
active_mi, 0, 0))
{
send_ok(thd);
}
pthread_mutex_unlock(&LOCK_active_mi);
break;
}
#endif /* HAVE_REPLICATION */
case SQLCOM_CREATE_TABLE:
{
/* If CREATE TABLE of non-temporary table, do implicit commit */
if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
{
if (end_active_trans(thd))
{
res= -1;
break;
}
}
DBUG_ASSERT(first_table == all_tables && first_table != 0);
bool link_to_local;
// Skip first table, which is the table we are creating
TABLE_LIST *create_table= lex->unlink_first_table(&link_to_local);
TABLE_LIST *select_tables= lex->query_tables;
/*
Code below (especially in mysql_create_table() and select_create
methods) may modify HA_CREATE_INFO structure in LEX, so we have to
use a copy of this structure to make execution prepared statement-
safe. A shallow copy is enough as this code won't modify any memory
referenced from this structure.
*/
HA_CREATE_INFO create_info(lex->create_info);
/*
We need to copy alter_info for the same reasons of re-execution
safety, only in case of Alter_info we have to do (almost) a deep
copy.
*/
Alter_info alter_info(lex->alter_info, thd->mem_root);
if (thd->is_fatal_error)
{
/* If out of memory when creating a copy of alter_info. */
res= 1;
goto end_with_restore_list;
}
if ((res= create_table_precheck(thd, select_tables, create_table)))
goto end_with_restore_list;
/* Might have been updated in create_table_precheck */
create_info.alias= create_table->alias;
#ifndef HAVE_READLINK
if (create_info.data_file_name)
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
"DATA DIRECTORY option ignored");
if (create_info.index_file_name)
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
"INDEX DIRECTORY option ignored");
create_info.data_file_name= create_info.index_file_name= NULL;
#else
/* Fix names if symlinked tables */
if (append_file_to_dir(thd, &create_info.data_file_name,
create_table->table_name) ||
append_file_to_dir(thd, &create_info.index_file_name,
create_table->table_name))
goto end_with_restore_list;
#endif
/*
If we are using SET CHARSET without DEFAULT, add an implicit
DEFAULT to not confuse old users. (This may change).
*/
if ((create_info.used_fields &
(HA_CREATE_USED_DEFAULT_CHARSET | HA_CREATE_USED_CHARSET)) ==
HA_CREATE_USED_CHARSET)
{
create_info.used_fields&= ~HA_CREATE_USED_CHARSET;
create_info.used_fields|= HA_CREATE_USED_DEFAULT_CHARSET;
create_info.default_table_charset= create_info.table_charset;
create_info.table_charset= 0;
}
/*
The create-select command will open and read-lock the select table
and then create, open and write-lock the new table. If a global
read lock steps in, we get a deadlock. The write lock waits for
the global read lock, while the global read lock waits for the
select table to be closed. So we wait until the global readlock is
gone before starting both steps. Note that
wait_if_global_read_lock() sets a protection against a new global
read lock when it succeeds. This needs to be released by
start_waiting_global_read_lock(). We protect the normal CREATE
TABLE in the same way. That way we avoid that a new table is
created during a gobal read lock.
*/
if (!thd->locked_tables &&
!(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
{
res= 1;
goto end_with_restore_list;
}
#ifdef WITH_PARTITION_STORAGE_ENGINE
{
partition_info *part_info= thd->lex->part_info;
if (part_info && !(part_info= thd->lex->part_info->get_clone()))
{
res= -1;
goto end_with_restore_list;
}
thd->work_part_info= part_info;
}
#endif
if (select_lex->item_list.elements) // With select
{
select_result *result;
select_lex->options|= SELECT_NO_UNLOCK;
unit->set_limit(select_lex);
if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
{
lex->link_first_table_back(create_table, link_to_local);
create_table->create= TRUE;
}
if (!(res= open_and_lock_tables(thd, lex->query_tables)))
{
/*
Is table which we are changing used somewhere in other parts
of query
*/
if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
{
TABLE_LIST *duplicate;
create_table= lex->unlink_first_table(&link_to_local);
if ((duplicate= unique_table(thd, create_table, select_tables, 0)))
{
update_non_unique_table_error(create_table, "CREATE", duplicate);
res= 1;
goto end_with_restore_list;
}
}
/* If we create merge table, we have to test tables in merge, too */
if (create_info.used_fields & HA_CREATE_USED_UNION)
{
TABLE_LIST *tab;
for (tab= (TABLE_LIST*) create_info.merge_list.first;
tab;
tab= tab->next_local)
{
TABLE_LIST *duplicate;
if ((duplicate= unique_table(thd, tab, select_tables, 0)))
{
update_non_unique_table_error(tab, "CREATE", duplicate);
res= 1;
goto end_with_restore_list;
}
}
}
/*
select_create is currently not re-execution friendly and
needs to be created for every execution of a PS/SP.
*/
if ((result= new select_create(create_table,
&create_info,
&alter_info,
select_lex->item_list,
lex->duplicates,
lex->ignore)))
{
/*
CREATE from SELECT give its SELECT_LEX for SELECT,
and item_list belong to SELECT
*/
res= handle_select(thd, lex, result, 0);
delete result;
}
}
else if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
create_table= lex->unlink_first_table(&link_to_local);
}
else
{
/* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
if (create_info.options & HA_LEX_CREATE_TMP_TABLE)
thd->options|= OPTION_KEEP_LOG;
/* regular create */
if (create_info.options & HA_LEX_CREATE_TABLE_LIKE)
res= mysql_create_like_table(thd, create_table, select_tables,
&create_info);
else
{
res= mysql_create_table(thd, create_table->db,
create_table->table_name, &create_info,
&alter_info, 0, 0);
}
if (!res)
send_ok(thd);
}
/* put tables back for PS rexecuting */
end_with_restore_list:
lex->link_first_table_back(create_table, link_to_local);
break;
}
case SQLCOM_CREATE_INDEX:
/* Fall through */
case SQLCOM_DROP_INDEX:
/*
CREATE INDEX and DROP INDEX are implemented by calling ALTER
TABLE with proper arguments.
In the future ALTER TABLE will notice that the request is to
only add indexes and create these one by one for the existing
table without having to do a full rebuild.
*/
{
/* Prepare stack copies to be re-execution safe */
HA_CREATE_INFO create_info;
Alter_info alter_info(lex->alter_info, thd->mem_root);
if (thd->is_fatal_error) /* out of memory creating a copy of alter_info */
goto error;
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if (check_one_table_access(thd, INDEX_ACL, all_tables))
goto error; /* purecov: inspected */
if (end_active_trans(thd))
goto error;
/*
Currently CREATE INDEX or DROP INDEX cause a full table rebuild
and thus classify as slow administrative statements just like
ALTER TABLE.
*/
thd->enable_slow_log= opt_log_slow_admin_statements;
bzero((char*) &create_info, sizeof(create_info));
create_info.db_type= 0;
create_info.row_type= ROW_TYPE_NOT_USED;
create_info.default_table_charset= thd->variables.collation_database;
res= mysql_alter_table(thd, first_table->db, first_table->table_name,
&create_info, first_table, &alter_info,
0, (ORDER*) 0, 0);
break;
}
#ifdef HAVE_REPLICATION
case SQLCOM_SLAVE_START:
{
pthread_mutex_lock(&LOCK_active_mi);
start_slave(thd,active_mi,1 /* net report*/);
pthread_mutex_unlock(&LOCK_active_mi);
break;
}
case SQLCOM_SLAVE_STOP:
/*
If the client thread has locked tables, a deadlock is possible.
Assume that
- the client thread does LOCK TABLE t READ.
- then the master updates t.
- then the SQL slave thread wants to update t,
so it waits for the client thread because t is locked by it.
- then the client thread does SLAVE STOP.
SLAVE STOP waits for the SQL slave thread to terminate its
update t, which waits for the client thread because t is locked by it.
To prevent that, refuse SLAVE STOP if the
client thread has locked tables
*/
if (thd->locked_tables || thd->active_transaction() || thd->global_read_lock)
{
my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
goto error;
}
{
pthread_mutex_lock(&LOCK_active_mi);
stop_slave(thd,active_mi,1/* net report*/);
pthread_mutex_unlock(&LOCK_active_mi);
break;
}
#endif /* HAVE_REPLICATION */
case SQLCOM_ALTER_TABLE:
DBUG_ASSERT(first_table == all_tables && first_table != 0);
{
ulong priv=0;
ulong priv_needed= ALTER_ACL;
/*
Code in mysql_alter_table() may modify its HA_CREATE_INFO argument,
so we have to use a copy of this structure to make execution
prepared statement- safe. A shallow copy is enough as no memory
referenced from this structure will be modified.
*/
HA_CREATE_INFO create_info(lex->create_info);
Alter_info alter_info(lex->alter_info, thd->mem_root);
if (thd->is_fatal_error) /* out of memory creating a copy of alter_info */
goto error;
/*
We also require DROP priv for ALTER TABLE ... DROP PARTITION, as well
as for RENAME TO, as being done by SQLCOM_RENAME_TABLE
*/
if (alter_info.flags & (ALTER_DROP_PARTITION | ALTER_RENAME))
priv_needed|= DROP_ACL;
/* Must be set in the parser */
DBUG_ASSERT(select_lex->db);
if (check_access(thd, priv_needed, first_table->db,
&first_table->grant.privilege, 0, 0,
test(first_table->schema_table)) ||
check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0,
is_schema_db(select_lex->db))||
check_merge_table_access(thd, first_table->db,
(TABLE_LIST *)
create_info.merge_list.first))
goto error; /* purecov: inspected */
if (check_grant(thd, priv_needed, all_tables, 0, UINT_MAX, 0))
goto error;
if (lex->name.str && !test_all_bits(priv,INSERT_ACL | CREATE_ACL))
{ // Rename of table
TABLE_LIST tmp_table;
bzero((char*) &tmp_table,sizeof(tmp_table));
tmp_table.table_name= lex->name.str;
tmp_table.db=select_lex->db;
tmp_table.grant.privilege=priv;
if (check_grant(thd, INSERT_ACL | CREATE_ACL, &tmp_table, 0,
UINT_MAX, 0))
goto error;
}
/* Don't yet allow changing of symlinks with ALTER TABLE */
if (create_info.data_file_name)
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
"DATA DIRECTORY option ignored");
if (create_info.index_file_name)
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
"INDEX DIRECTORY option ignored");
create_info.data_file_name= create_info.index_file_name= NULL;
/* ALTER TABLE ends previous transaction */
if (end_active_trans(thd))
goto error;
if (!thd->locked_tables &&
!(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
{
res= 1;
break;
}
thd->enable_slow_log= opt_log_slow_admin_statements;
res= mysql_alter_table(thd, select_lex->db, lex->name.str,
&create_info,
first_table,
&alter_info,
select_lex->order_list.elements,
(ORDER *) select_lex->order_list.first,
lex->ignore);
break;
}
case SQLCOM_RENAME_TABLE:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
TABLE_LIST *table;
for (table= first_table; table; table= table->next_local->next_local)
{
if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
&table->grant.privilege,0,0, test(table->schema_table)) ||
check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
&table->next_local->grant.privilege, 0, 0,
test(table->next_local->schema_table)))
goto error;
TABLE_LIST old_list, new_list;
/*
we do not need initialize old_list and new_list because we will
come table[0] and table->next[0] there
*/
old_list= table[0];
new_list= table->next_local[0];
if (check_grant(thd, ALTER_ACL | DROP_ACL, &old_list, 0, 1, 0) ||
(!test_all_bits(table->next_local->grant.privilege,
INSERT_ACL | CREATE_ACL) &&
check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0, 1, 0)))
goto error;
}
query_cache_invalidate3(thd, first_table, 0);
if (end_active_trans(thd) || mysql_rename_tables(thd, first_table, 0))
goto error;
break;
}
#ifndef EMBEDDED_LIBRARY
case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
MYF(0)); /* purecov: inspected */
goto error;
#else
{
if (check_global_access(thd, SUPER_ACL))
goto error;
res = show_binlogs(thd);
break;
}
#endif
#endif /* EMBEDDED_LIBRARY */
case SQLCOM_SHOW_CREATE:
DBUG_ASSERT(first_table == all_tables && first_table != 0);
#ifdef DONT_ALLOW_SHOW_COMMANDS
my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
MYF(0)); /* purecov: inspected */
goto error;
#else
{
/* Ignore temporary tables if this is "SHOW CREATE VIEW" */
if (lex->only_view)
first_table->skip_temporary= 1;
if (check_show_create_table_access(thd, first_table))
goto error;
res= mysqld_show_create(thd, first_table);
break;
}
#endif
case SQLCOM_CHECKSUM:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if (check_table_access(thd, SELECT_ACL | EXTRA_ACL, all_tables, 0))
goto error; /* purecov: inspected */
res = mysql_checksum_table(thd, first_table, &lex->check_opt);
break;
}
case SQLCOM_REPAIR:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
goto error; /* purecov: inspected */
thd->enable_slow_log= opt_log_slow_admin_statements;
res= mysql_repair_table(thd, first_table, &lex->check_opt);
/* ! we write after unlocking the table */
if (!res && !lex->no_write_to_binlog)
{
/*
Presumably, REPAIR and binlog writing doesn't require synchronization
*/
if (mysql_bin_log.is_open())
{
thd->clear_error(); // No binlog error generated
thd->binlog_query(THD::STMT_QUERY_TYPE,
thd->query, thd->query_length, 0, FALSE);
}
}
select_lex->table_list.first= (uchar*) first_table;
lex->query_tables=all_tables;
break;
}
case SQLCOM_CHECK:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if (check_table_access(thd, SELECT_ACL | EXTRA_ACL , all_tables, 0))
goto error; /* purecov: inspected */
thd->enable_slow_log= opt_log_slow_admin_statements;
res = mysql_check_table(thd, first_table, &lex->check_opt);
select_lex->table_list.first= (uchar*) first_table;
lex->query_tables=all_tables;
break;
}
case SQLCOM_ANALYZE:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
goto error; /* purecov: inspected */
thd->enable_slow_log= opt_log_slow_admin_statements;
res= mysql_analyze_table(thd, first_table, &lex->check_opt);
/* ! we write after unlocking the table */
if (!res && !lex->no_write_to_binlog)
{
/*
Presumably, ANALYZE and binlog writing doesn't require synchronization
*/
if (mysql_bin_log.is_open())
{
thd->clear_error(); // No binlog error generated
thd->binlog_query(THD::STMT_QUERY_TYPE,
thd->query, thd->query_length, 0, FALSE);
}
}
select_lex->table_list.first= (uchar*) first_table;
lex->query_tables=all_tables;
break;
}
case SQLCOM_OPTIMIZE:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
goto error; /* purecov: inspected */
thd->enable_slow_log= opt_log_slow_admin_statements;
res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
mysql_recreate_table(thd, first_table) :
mysql_optimize_table(thd, first_table, &lex->check_opt);
/* ! we write after unlocking the table */
if (!res && !lex->no_write_to_binlog)
{
/*
Presumably, OPTIMIZE and binlog writing doesn't require synchronization
*/
if (mysql_bin_log.is_open())
{
thd->clear_error(); // No binlog error generated
thd->binlog_query(THD::STMT_QUERY_TYPE,
thd->query, thd->query_length, 0, FALSE);
}
}
select_lex->table_list.first= (uchar*) first_table;
lex->query_tables=all_tables;
break;
}
case SQLCOM_UPDATE:
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if (update_precheck(thd, all_tables))
break;
DBUG_ASSERT(select_lex->offset_limit == 0);
unit->set_limit(select_lex);
res= (up_result= mysql_update(thd, all_tables,
select_lex->item_list,
lex->value_list,
select_lex->where,
select_lex->order_list.elements,
(ORDER *) select_lex->order_list.first,
unit->select_limit_cnt,
lex->duplicates, lex->ignore));
/* mysql_update return 2 if we need to switch to multi-update */
if (up_result != 2)
break;
/* Fall through */
case SQLCOM_UPDATE_MULTI:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
/* if we switched from normal update, rights are checked */
if (up_result != 2)
{
if ((res= multi_update_precheck(thd, all_tables)))
break;
}
else
res= 0;
res= mysql_multi_update_prepare(thd);
#ifdef HAVE_REPLICATION
/* Check slave filtering rules */
if (unlikely(thd->slave_thread))
{
if (all_tables_not_ok(thd, all_tables))
{
if (res!= 0)
{
res= 0; /* don't care of prev failure */
thd->clear_error(); /* filters are of highest prior */
}
/* we warn the slave SQL thread */
my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
break;
}
if (res)
break;
}
else
{
#endif /* HAVE_REPLICATION */
if (res)
break;
if (opt_readonly &&
!(thd->security_ctx->master_access & SUPER_ACL) &&
some_non_temp_table_to_be_updated(thd, all_tables))
{
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
break;
}
#ifdef HAVE_REPLICATION
} /* unlikely */
#endif
res= mysql_multi_update(thd, all_tables,
&select_lex->item_list,
&lex->value_list,
select_lex->where,
select_lex->options,
lex->duplicates, lex->ignore, unit, select_lex);
break;
}
case SQLCOM_REPLACE:
#ifndef DBUG_OFF
if (mysql_bin_log.is_open())
{
/*
Generate an incident log event before writing the real event
to the binary log. We put this event is before the statement
since that makes it simpler to check that the statement was
not executed on the slave (since incidents usually stop the
slave).
Observe that any row events that are generated will be
generated before.
This is only for testing purposes and will not be present in a
release build.
*/
Incident incident= INCIDENT_NONE;
DBUG_PRINT("debug", ("Just before generate_incident()"));
DBUG_EXECUTE_IF("incident_database_resync_on_replace",
incident= INCIDENT_LOST_EVENTS;);
if (incident)
{
Incident_log_event ev(thd, incident);
mysql_bin_log.write(&ev);
mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
}
DBUG_PRINT("debug", ("Just after generate_incident()"));
}
#endif
case SQLCOM_INSERT:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if ((res= insert_precheck(thd, all_tables)))
break;
if (!thd->locked_tables &&
!(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
{
res= 1;
break;
}
res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values,
lex->update_list, lex->value_list,
lex->duplicates, lex->ignore);
/*
If we have inserted into a VIEW, and the base table has
AUTO_INCREMENT column, but this column is not accessible through
a view, then we should restore LAST_INSERT_ID to the value it
had before the statement.
*/
if (first_table->view && !first_table->contain_auto_increment)
thd->first_successful_insert_id_in_cur_stmt=
thd->first_successful_insert_id_in_prev_stmt;
break;
}
case SQLCOM_REPLACE_SELECT:
case SQLCOM_INSERT_SELECT:
{
select_result *sel_result;
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if ((res= insert_precheck(thd, all_tables)))
break;
/* Fix lock for first table */
if (first_table->lock_type == TL_WRITE_DELAYED)
first_table->lock_type= TL_WRITE;
/* Don't unlock tables until command is written to binary log */
select_lex->options|= SELECT_NO_UNLOCK;
unit->set_limit(select_lex);
if (! thd->locked_tables &&
! (need_start_waiting= ! wait_if_global_read_lock(thd, 0, 1)))
{
res= 1;
break;
}
if (!(res= open_and_lock_tables(thd, all_tables)))
{
/* Skip first table, which is the table we are inserting in */
TABLE_LIST *second_table= first_table->next_local;
select_lex->table_list.first= (uchar*) second_table;
select_lex->context.table_list=
select_lex->context.first_name_resolution_table= second_table;
res= mysql_insert_select_prepare(thd);
if (!res && (sel_result= new select_insert(first_table,
first_table->table,
&lex->field_list,
&lex->update_list,
&lex->value_list,
lex->duplicates,
lex->ignore)))
{
res= handle_select(thd, lex, sel_result, OPTION_SETUP_TABLES_DONE);
/*
Invalidate the table in the query cache if something changed
after unlocking when changes become visible.
TODO: this is workaround. right way will be move invalidating in
the unlock procedure.
*/
if (first_table->lock_type == TL_WRITE_CONCURRENT_INSERT &&
thd->lock)
{
/* INSERT ... SELECT should invalidate only the very first table */
TABLE_LIST *save_table= first_table->next_local;
first_table->next_local= 0;
mysql_unlock_tables(thd, thd->lock);
query_cache_invalidate3(thd, first_table, 1);
first_table->next_local= save_table;
thd->lock=0;
}
delete sel_result;
}
/* revert changes for SP */
select_lex->table_list.first= (uchar*) first_table;
}
/*
If we have inserted into a VIEW, and the base table has
AUTO_INCREMENT column, but this column is not accessible through
a view, then we should restore LAST_INSERT_ID to the value it
had before the statement.
*/
if (first_table->view && !first_table->contain_auto_increment)
thd->first_successful_insert_id_in_cur_stmt=
thd->first_successful_insert_id_in_prev_stmt;
break;
}
case SQLCOM_TRUNCATE:
if (end_active_trans(thd))
{
res= -1;
break;
}
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if (check_one_table_access(thd, DROP_ACL, all_tables))
goto error;
/*
Don't allow this within a transaction because we want to use
re-generate table
*/
if (thd->locked_tables || thd->active_transaction())
{
my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
goto error;
}
res= mysql_truncate(thd, first_table, 0);
break;
case SQLCOM_DELETE:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if ((res= delete_precheck(thd, all_tables)))
break;
DBUG_ASSERT(select_lex->offset_limit == 0);
unit->set_limit(select_lex);
if (!thd->locked_tables &&
!(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
{
res= 1;
break;
}
res = mysql_delete(thd, all_tables, select_lex->where,
&select_lex->order_list,
unit->select_limit_cnt, select_lex->options,
FALSE);
break;
}
case SQLCOM_DELETE_MULTI:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
TABLE_LIST *aux_tables=
(TABLE_LIST *)thd->lex->auxiliary_table_list.first;
multi_delete *del_result;
if (!thd->locked_tables &&
!(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
{
res= 1;
break;
}
if ((res= multi_delete_precheck(thd, all_tables)))
break;
/* condition will be TRUE on SP re-excuting */
if (select_lex->item_list.elements != 0)
select_lex->item_list.empty();
if (add_item_to_list(thd, new Item_null()))
goto error;
thd->proc_info="init";
if ((res= open_and_lock_tables(thd, all_tables)))
break;
if ((res= mysql_multi_delete_prepare(thd)))
goto error;
if (!thd->is_fatal_error &&
(del_result= new multi_delete(aux_tables, lex->table_count)))
{
res= mysql_select(thd, &select_lex->ref_pointer_array,
select_lex->get_table_list(),
select_lex->with_wild,
select_lex->item_list,
select_lex->where,
0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
(ORDER *)NULL,
select_lex->options | thd->options |
SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
OPTION_SETUP_TABLES_DONE,
del_result, unit, select_lex);
delete del_result;
}
else
res= TRUE; // Error
break;
}
case SQLCOM_DROP_TABLE:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if (!lex->drop_temporary)
{
if (check_table_access(thd, DROP_ACL, all_tables, 0))
goto error; /* purecov: inspected */
if (end_active_trans(thd))
goto error;
}
else
{
/*
If this is a slave thread, we may sometimes execute some
DROP / * 40005 TEMPORARY * / TABLE
that come from parts of binlogs (likely if we use RESET SLAVE or CHANGE
MASTER TO), while the temporary table has already been dropped.
To not generate such irrelevant "table does not exist errors",
we silently add IF EXISTS if TEMPORARY was used.
*/
if (thd->slave_thread)
lex->drop_if_exists= 1;
/* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */
thd->options|= OPTION_KEEP_LOG;
}
/* DDL and binlog write order protected by LOCK_open */
res= mysql_rm_table(thd, first_table, lex->drop_if_exists,
lex->drop_temporary);
}
break;
case SQLCOM_SHOW_PROCESSLIST:
if (!thd->security_ctx->priv_user[0] &&
check_global_access(thd,PROCESS_ACL))
break;
mysqld_list_processes(thd,
(thd->security_ctx->master_access & PROCESS_ACL ?
NullS :
thd->security_ctx->priv_user),
lex->verbose);
break;
case SQLCOM_SHOW_STORAGE_ENGINES:
res= mysqld_show_storage_engines(thd);
break;
case SQLCOM_SHOW_AUTHORS:
res= mysqld_show_authors(thd);
break;
case SQLCOM_SHOW_CONTRIBUTORS:
res= mysqld_show_contributors(thd);
break;
case SQLCOM_SHOW_PRIVILEGES:
res= mysqld_show_privileges(thd);
break;
case SQLCOM_SHOW_COLUMN_TYPES:
res= mysqld_show_column_types(thd);
break;
case SQLCOM_SHOW_ENGINE_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
MYF(0)); /* purecov: inspected */
goto error;
#else
{
if (check_access(thd, FILE_ACL, any_db,0,0,0,0))
goto error;
res= ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_LOGS);
break;
}
#endif
case SQLCOM_CHANGE_DB:
{
LEX_STRING db_str= { (char *) select_lex->db, strlen(select_lex->db) };
if (!mysql_change_db(thd, &db_str, FALSE))
send_ok(thd);
break;
}
case SQLCOM_LOAD:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
uint privilege= (lex->duplicates == DUP_REPLACE ?
INSERT_ACL | DELETE_ACL : INSERT_ACL) |
(lex->local_file ? 0 : FILE_ACL);
if (lex->local_file)
{
if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
!opt_local_infile)
{
my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0));
goto error;
}
}
if (check_one_table_access(thd, privilege, all_tables))
goto error;
res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
lex->update_list, lex->value_list, lex->duplicates,
lex->ignore, (bool) lex->local_file);
break;
}
case SQLCOM_SET_OPTION:
{
List<set_var_base> *lex_var_list= &lex->var_list;
if ((check_table_access(thd, SELECT_ACL, all_tables, 0) ||
open_and_lock_tables(thd, all_tables)))
goto error;
if (lex->one_shot_set && not_all_support_one_shot(lex_var_list))
{
my_error(ER_RESERVED_SYNTAX, MYF(0), "SET ONE_SHOT");
goto error;
}
if (!(res= sql_set_variables(thd, lex_var_list)))
{
/*
If the previous command was a SET ONE_SHOT, we don't want to forget
about the ONE_SHOT property of that SET. So we use a |= instead of = .
*/
thd->one_shot_set|= lex->one_shot_set;
send_ok(thd);
}
break;
}
case SQLCOM_UNLOCK_TABLES:
/*
It is critical for mysqldump --single-transaction --master-data that
UNLOCK TABLES does not implicitely commit a connection which has only
done FLUSH TABLES WITH READ LOCK + BEGIN. If this assumption becomes
false, mysqldump will not work.
*/
unlock_locked_tables(thd);
if (thd->options & OPTION_TABLE_LOCK)
{
end_active_trans(thd);
thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
}
if (thd->global_read_lock)
unlock_global_read_lock(thd);
send_ok(thd);
break;
case SQLCOM_LOCK_TABLES:
unlock_locked_tables(thd);
if (end_active_trans(thd))
goto error;
if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables, 0))
goto error;
thd->in_lock_tables=1;
thd->options|= OPTION_TABLE_LOCK;
if (!(res= simple_open_n_lock_tables(thd, all_tables)))
{
#ifdef HAVE_QUERY_CACHE
if (thd->variables.query_cache_wlock_invalidate)
query_cache.invalidate_locked_for_write(first_table);
#endif /*HAVE_QUERY_CACHE*/
thd->locked_tables=thd->lock;
thd->lock=0;
send_ok(thd);
}
else
thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
thd->in_lock_tables=0;
break;
case SQLCOM_CREATE_DB:
{
/*
As mysql_create_db() may modify HA_CREATE_INFO structure passed to
it, we need to use a copy of LEX::create_info to make execution
prepared statement- safe.
*/
HA_CREATE_INFO create_info(lex->create_info);
if (end_active_trans(thd))
{
res= -1;
break;
}
char *alias;
if (!(alias=thd->strmake(lex->name.str, lex->name.length)) ||
check_db_name(&lex->name))
{
my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
break;
}
/*
If in a slave thread :
CREATE DATABASE DB was certainly not preceded by USE DB.
For that reason, db_ok() in sql/slave.cc did not check the
do_db/ignore_db. And as this query involves no tables, tables_ok()
above was not called. So we have to check rules again here.
*/
#ifdef HAVE_REPLICATION
if (thd->slave_thread &&
(!rpl_filter->db_ok(lex->name.str) ||
!rpl_filter->db_ok_with_wild_table(lex->name.str)))
{
my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
break;
}
#endif
if (check_access(thd,CREATE_ACL,lex->name.str, 0, 1, 0,
is_schema_db(lex->name.str)))
break;
res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias :
lex->name.str), &create_info, 0);
break;
}
case SQLCOM_DROP_DB:
{
if (end_active_trans(thd))
{
res= -1;
break;
}
if (check_db_name(&lex->name))
{
my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
break;
}
/*
If in a slave thread :
DROP DATABASE DB may not be preceded by USE DB.
For that reason, maybe db_ok() in sql/slave.cc did not check the
do_db/ignore_db. And as this query involves no tables, tables_ok()
above was not called. So we have to check rules again here.
*/
#ifdef HAVE_REPLICATION
if (thd->slave_thread &&
(!rpl_filter->db_ok(lex->name.str) ||
!rpl_filter->db_ok_with_wild_table(lex->name.str)))
{
my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
break;
}
#endif
if (check_access(thd,DROP_ACL,lex->name.str,0,1,0,
is_schema_db(lex->name.str)))
break;
if (thd->locked_tables || thd->active_transaction())
{
my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
goto error;
}
res= mysql_rm_db(thd, lex->name.str, lex->drop_if_exists, 0);
break;
}
case SQLCOM_RENAME_DB:
{
LEX_STRING *olddb, *newdb;
List_iterator <LEX_STRING> db_list(lex->db_list);
olddb= db_list++;
newdb= db_list++;
if (end_active_trans(thd))
{
res= 1;
break;
}
#ifdef HAVE_REPLICATION
if (thd->slave_thread &&
(!rpl_filter->db_ok(olddb->str) ||
!rpl_filter->db_ok(newdb->str) ||
!rpl_filter->db_ok_with_wild_table(olddb->str) ||
!rpl_filter->db_ok_with_wild_table(newdb->str)))
{
res= 1;
my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
break;
}
#endif
if (check_db_name(newdb))
{
my_error(ER_WRONG_DB_NAME, MYF(0), newdb->str);
break;
}
if (check_access(thd,ALTER_ACL,olddb->str,0,1,0,is_schema_db(olddb->str)) ||
check_access(thd,DROP_ACL,olddb->str,0,1,0,is_schema_db(olddb->str)) ||
check_access(thd,CREATE_ACL,newdb->str,0,1,0,is_schema_db(newdb->str)))
{
res= 1;
break;
}
if (thd->locked_tables || thd->active_transaction())
{
res= 1;
my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
goto error;
}
res= mysql_rename_db(thd, olddb, newdb);
if (!res)
send_ok(thd);
break;
}
case SQLCOM_ALTER_DB:
{
LEX_STRING *db= &lex->name;
HA_CREATE_INFO create_info(lex->create_info);
if (check_db_name(db))
{
my_error(ER_WRONG_DB_NAME, MYF(0), db->str);
break;
}
/*
If in a slave thread :
ALTER DATABASE DB may not be preceded by USE DB.
For that reason, maybe db_ok() in sql/slave.cc did not check the
do_db/ignore_db. And as this query involves no tables, tables_ok()
above was not called. So we have to check rules again here.
*/
#ifdef HAVE_REPLICATION
if (thd->slave_thread &&
(!rpl_filter->db_ok(db->str) ||
!rpl_filter->db_ok_with_wild_table(db->str)))
{
my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
break;
}
#endif
if (check_access(thd, ALTER_ACL, db->str, 0, 1, 0, is_schema_db(db->str)))
break;
if (thd->locked_tables || thd->active_transaction())
{
my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
goto error;
}
res= mysql_alter_db(thd, db->str, &create_info);
break;
}
case SQLCOM_SHOW_CREATE_DB:
{
if (check_db_name(&lex->name))
{
my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
break;
}
res= mysqld_show_create_db(thd, lex->name.str, &lex->create_info);
break;
}
case SQLCOM_CREATE_EVENT:
case SQLCOM_ALTER_EVENT:
do
{
DBUG_ASSERT(lex->event_parse_data);
if (lex->table_or_sp_used())
{
my_error(ER_NOT_SUPPORTED_YET, MYF(0), "Usage of subqueries or stored "
"function calls as part of this statement");
break;
}
res= sp_process_definer(thd);
if (res)
break;
switch (lex->sql_command) {
case SQLCOM_CREATE_EVENT:
{
bool if_not_exists= (lex->create_info.options &
HA_LEX_CREATE_IF_NOT_EXISTS);
res= Events::create_event(thd, lex->event_parse_data, if_not_exists);
break;
}
case SQLCOM_ALTER_EVENT:
res= Events::update_event(thd, lex->event_parse_data,
lex->spname ? &lex->spname->m_db : NULL,
lex->spname ? &lex->spname->m_name : NULL);
break;
default:
DBUG_ASSERT(0);
}
DBUG_PRINT("info",("DDL error code=%d", res));
if (!res)
send_ok(thd);
} while (0);
/* Don't do it, if we are inside a SP */
if (!thd->spcont)
{
delete lex->sphead;
lex->sphead= NULL;
}
/* lex->unit.cleanup() is called outside, no need to call it here */
break;
case SQLCOM_SHOW_CREATE_EVENT:
res= Events::show_create_event(thd, lex->spname->m_db,
lex->spname->m_name);
break;
case SQLCOM_DROP_EVENT:
if (!(res= Events::drop_event(thd,
lex->spname->m_db, lex->spname->m_name,
lex->drop_if_exists)))
send_ok(thd);
break;
case SQLCOM_CREATE_FUNCTION: // UDF function
{
if (check_access(thd,INSERT_ACL,"mysql",0,1,0,0))
break;
#ifdef HAVE_DLOPEN
if (sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
&thd->sp_func_cache, FALSE))
{
my_error(ER_UDF_EXISTS, MYF(0), lex->spname->m_name.str);
goto error;
}
if (!(res = mysql_create_function(thd, &lex->udf)))
send_ok(thd);
#else
my_error(ER_CANT_OPEN_LIBRARY, MYF(0), lex->udf.dl, 0, "feature disabled");
res= TRUE;
#endif
break;
}
#ifndef NO_EMBEDDED_ACCESS_CHECKS
case SQLCOM_CREATE_USER:
{
if (check_access(thd, INSERT_ACL, "mysql", 0, 1, 1, 0) &&
check_global_access(thd,CREATE_USER_ACL))
break;
if (end_active_trans(thd))
goto error;
/* Conditionally writes to binlog */
if (!(res= mysql_create_user(thd, lex->users_list)))
send_ok(thd);
break;
}
case SQLCOM_DROP_USER:
{
if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 1, 0) &&
check_global_access(thd,CREATE_USER_ACL))
break;
if (end_active_trans(thd))
goto error;
/* Conditionally writes to binlog */
if (!(res= mysql_drop_user(thd, lex->users_list)))
send_ok(thd);
break;
}
case SQLCOM_RENAME_USER:
{
if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
check_global_access(thd,CREATE_USER_ACL))
break;
if (end_active_trans(thd))
goto error;
/* Conditionally writes to binlog */
if (!(res= mysql_rename_user(thd, lex->users_list)))
send_ok(thd);
break;
}
case SQLCOM_REVOKE_ALL:
{
if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
check_global_access(thd,CREATE_USER_ACL))
break;
/* Conditionally writes to binlog */
if (!(res = mysql_revoke_all(thd, lex->users_list)))
send_ok(thd);
break;
}
case SQLCOM_REVOKE:
case SQLCOM_GRANT:
{
if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
first_table ? first_table->db : select_lex->db,
first_table ? &first_table->grant.privilege : 0,
first_table ? 0 : 1, 0,
first_table ? (bool) first_table->schema_table :
select_lex->db ? is_schema_db(select_lex->db) : 0))
goto error;
if (thd->security_ctx->user) // If not replication
{
LEX_USER *user, *tmp_user;
List_iterator <LEX_USER> user_list(lex->users_list);
while ((tmp_user= user_list++))
{
if (!(user= get_current_user(thd, tmp_user)))
goto error;
if (specialflag & SPECIAL_NO_RESOLVE &&
hostname_requires_resolving(user->host.str))
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_WARN_HOSTNAME_WONT_WORK,
ER(ER_WARN_HOSTNAME_WONT_WORK),
user->host.str);
// Are we trying to change a password of another user
DBUG_ASSERT(user->host.str != 0);
if (strcmp(thd->security_ctx->user, user->user.str) ||
my_strcasecmp(system_charset_info,
user->host.str, thd->security_ctx->host_or_ip))
{
// TODO: use check_change_password()
if (is_acl_user(user->host.str, user->user.str) &&
user->password.str &&
check_access(thd, UPDATE_ACL,"mysql",0,1,1,0))
{
my_message(ER_PASSWORD_NOT_ALLOWED,
ER(ER_PASSWORD_NOT_ALLOWED), MYF(0));
goto error;
}
}
}
}
if (first_table)
{
if (lex->type == TYPE_ENUM_PROCEDURE ||
lex->type == TYPE_ENUM_FUNCTION)
{
uint grants= lex->all_privileges
? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL)
: lex->grant;
if (check_grant_routine(thd, grants | GRANT_ACL, all_tables,
lex->type == TYPE_ENUM_PROCEDURE, 0))
goto error;
/* Conditionally writes to binlog */
res= mysql_routine_grant(thd, all_tables,
lex->type == TYPE_ENUM_PROCEDURE,
lex->users_list, grants,
lex->sql_command == SQLCOM_REVOKE, 0);
}
else
{
if (check_grant(thd,(lex->grant | lex->grant_tot_col | GRANT_ACL),
all_tables, 0, UINT_MAX, 0))
goto error;
/* Conditionally writes to binlog */
res= mysql_table_grant(thd, all_tables, lex->users_list,
lex->columns, lex->grant,
lex->sql_command == SQLCOM_REVOKE);
}
}
else
{
if (lex->columns.elements || lex->type)
{
my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
MYF(0));
goto error;
}
else
/* Conditionally writes to binlog */
res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
lex->sql_command == SQLCOM_REVOKE);
if (!res)
{
if (lex->sql_command == SQLCOM_GRANT)
{
List_iterator <LEX_USER> str_list(lex->users_list);
LEX_USER *user, *tmp_user;
while ((tmp_user=str_list++))
{
if (!(user= get_current_user(thd, tmp_user)))
goto error;
reset_mqh(user, 0);
}
}
}
}
break;
}
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
case SQLCOM_RESET:
/*
RESET commands are never written to the binary log, so we have to
initialize this variable because RESET shares the same code as FLUSH
*/
lex->no_write_to_binlog= 1;
case SQLCOM_FLUSH:
{
bool write_to_binlog;
if (check_global_access(thd,RELOAD_ACL))
goto error;
/*
reload_acl_and_cache() will tell us if we are allowed to write to the
binlog or not.
*/
if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog))
{
/*
We WANT to write and we CAN write.
! we write after unlocking the table.
*/
/*
Presumably, RESET and binlog writing doesn't require synchronization
*/
if (!lex->no_write_to_binlog && write_to_binlog)
{
if (mysql_bin_log.is_open())
{
thd->binlog_query(THD::STMT_QUERY_TYPE,
thd->query, thd->query_length, 0, FALSE);
}
}
send_ok(thd);
}
break;
}
case SQLCOM_KILL:
{
Item *it= (Item *)lex->value_list.head();
if (lex->table_or_sp_used())
{
my_error(ER_NOT_SUPPORTED_YET, MYF(0), "Usage of subqueries or stored "
"function calls as part of this statement");
break;
}
if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1))
{
my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY),
MYF(0));
goto error;
}
sql_kill(thd, (ulong)it->val_int(), lex->type & ONLY_KILL_QUERY);
break;
}
#ifndef NO_EMBEDDED_ACCESS_CHECKS
case SQLCOM_SHOW_GRANTS:
{
LEX_USER *grant_user= get_current_user(thd, lex->grant_user);
if (!grant_user)
goto error;
if ((thd->security_ctx->priv_user &&
!strcmp(thd->security_ctx->priv_user, grant_user->user.str)) ||
!check_access(thd, SELECT_ACL, "mysql",0,1,0,0))
{
res = mysql_show_grants(thd, grant_user);
}
break;
}
#endif
case SQLCOM_HA_OPEN:
DBUG_ASSERT(first_table == all_tables && first_table != 0);
if (check_table_access(thd, SELECT_ACL, all_tables, 0))
goto error;
res= mysql_ha_open(thd, first_table, 0);
break;
case SQLCOM_HA_CLOSE:
DBUG_ASSERT(first_table == all_tables && first_table != 0);
res= mysql_ha_close(thd, first_table);
break;
case SQLCOM_HA_READ:
DBUG_ASSERT(first_table == all_tables && first_table != 0);
/*
There is no need to check for table permissions here, because
if a user has no permissions to read a table, he won't be
able to open it (with SQLCOM_HA_OPEN) in the first place.
*/
unit->set_limit(select_lex);
res= mysql_ha_read(thd, first_table, lex->ha_read_mode, lex->ident.str,
lex->insert_list, lex->ha_rkey_mode, select_lex->where,
unit->select_limit_cnt, unit->offset_limit_cnt);
break;
case SQLCOM_BEGIN:
if (thd->transaction.xid_state.xa_state != XA_NOTR)
{
my_error(ER_XAER_RMFAIL, MYF(0),
xa_state_names[thd->transaction.xid_state.xa_state]);
break;
}
if (begin_trans(thd))
goto error;
send_ok(thd);
break;
case SQLCOM_COMMIT:
if (end_trans(thd, lex->tx_release ? COMMIT_RELEASE :
lex->tx_chain ? COMMIT_AND_CHAIN : COMMIT))
goto error;
send_ok(thd);
break;
case SQLCOM_ROLLBACK:
if (end_trans(thd, lex->tx_release ? ROLLBACK_RELEASE :
lex->tx_chain ? ROLLBACK_AND_CHAIN : ROLLBACK))
goto error;
send_ok(thd);
break;
case SQLCOM_RELEASE_SAVEPOINT:
{
SAVEPOINT *sv;
for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
{
if (my_strnncoll(system_charset_info,
(uchar *)lex->ident.str, lex->ident.length,
(uchar *)sv->name, sv->length) == 0)
break;
}
if (sv)
{
if (ha_release_savepoint(thd, sv))
res= TRUE; // cannot happen
else
send_ok(thd);
thd->transaction.savepoints=sv->prev;
}
else
my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
break;
}
case SQLCOM_ROLLBACK_TO_SAVEPOINT:
{
SAVEPOINT *sv;
for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
{
if (my_strnncoll(system_charset_info,
(uchar *)lex->ident.str, lex->ident.length,
(uchar *)sv->name, sv->length) == 0)
break;
}
if (sv)
{
if (ha_rollback_to_savepoint(thd, sv))
res= TRUE; // cannot happen
else
{
if (((thd->options & OPTION_KEEP_LOG) || thd->no_trans_update.all) &&
!thd->slave_thread)
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_WARNING_NOT_COMPLETE_ROLLBACK,
ER(ER_WARNING_NOT_COMPLETE_ROLLBACK));
send_ok(thd);
}
thd->transaction.savepoints=sv;
}
else
my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
break;
}
case SQLCOM_SAVEPOINT:
if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN) ||
thd->in_sub_stmt) || !opt_using_transactions)
send_ok(thd);
else
{
SAVEPOINT **sv, *newsv;
for (sv=&thd->transaction.savepoints; *sv; sv=&(*sv)->prev)
{
if (my_strnncoll(system_charset_info,
(uchar *)lex->ident.str, lex->ident.length,
(uchar *)(*sv)->name, (*sv)->length) == 0)
break;
}
if (*sv) /* old savepoint of the same name exists */
{
newsv=*sv;
ha_release_savepoint(thd, *sv); // it cannot fail
*sv=(*sv)->prev;
}
else if ((newsv=(SAVEPOINT *) alloc_root(&thd->transaction.mem_root,
savepoint_alloc_size)) == 0)
{
my_error(ER_OUT_OF_RESOURCES, MYF(0));
break;
}
newsv->name=strmake_root(&thd->transaction.mem_root,
lex->ident.str, lex->ident.length);
newsv->length=lex->ident.length;
/*
if we'll get an error here, don't add new savepoint to the list.
we'll lose a little bit of memory in transaction mem_root, but it'll
be free'd when transaction ends anyway
*/
if (ha_savepoint(thd, newsv))
res= TRUE;
else
{
newsv->prev=thd->transaction.savepoints;
thd->transaction.savepoints=newsv;
send_ok(thd);
}
}
break;
case SQLCOM_CREATE_PROCEDURE:
case SQLCOM_CREATE_SPFUNCTION:
{
uint namelen;
char *name;
int sp_result= SP_INTERNAL_ERROR;
DBUG_ASSERT(lex->sphead != 0);
DBUG_ASSERT(lex->sphead->m_db.str); /* Must be initialized in the parser */
/*
Verify that the database name is allowed, optionally
lowercase it.
*/
if (check_db_name(&lex->sphead->m_db))
{
my_error(ER_WRONG_DB_NAME, MYF(0), lex->sphead->m_db.str);
goto create_sp_error;
}
/*
Check that a database directory with this name
exists. Design note: This won't work on virtual databases
like information_schema.
*/
if (check_db_dir_existence(lex->sphead->m_db.str))
{
my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str);
goto create_sp_error;
}
if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str, 0, 0, 0,
is_schema_db(lex->sphead->m_db.str)))
goto create_sp_error;
if (end_active_trans(thd))
goto create_sp_error;
name= lex->sphead->name(&namelen);
#ifdef HAVE_DLOPEN
if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
{
udf_func *udf = find_udf(name, namelen);
if (udf)
{
my_error(ER_UDF_EXISTS, MYF(0), name);
goto create_sp_error;
}
}
#endif
if (sp_process_definer(thd))
goto create_sp_error;
res= (sp_result= lex->sphead->create(thd));
switch (sp_result) {
case SP_OK:
#ifndef NO_EMBEDDED_ACCESS_CHECKS
/* only add privileges if really neccessary */
if (sp_automatic_privileges && !opt_noacl &&
check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS,
lex->sphead->m_db.str, name,
lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1))
{
if (sp_grant_privileges(thd, lex->sphead->m_db.str, name,
lex->sql_command == SQLCOM_CREATE_PROCEDURE))
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_PROC_AUTO_GRANT_FAIL,
ER(ER_PROC_AUTO_GRANT_FAIL));
close_thread_tables(thd);
}
#endif
break;
case SP_WRITE_ROW_FAILED:
my_error(ER_SP_ALREADY_EXISTS, MYF(0), SP_TYPE_STRING(lex), name);
break;
case SP_BAD_IDENTIFIER:
my_error(ER_TOO_LONG_IDENT, MYF(0), name);
break;
case SP_BODY_TOO_LONG:
my_error(ER_TOO_LONG_BODY, MYF(0), name);
break;
default:
my_error(ER_SP_STORE_FAILED, MYF(0), SP_TYPE_STRING(lex), name);
break;
} /* end switch */
/*
Capture all errors within this CASE and
clean up the environment.
*/
create_sp_error:
if (sp_result != SP_OK )
goto error;
send_ok(thd);
break; /* break super switch */
} /* end case group bracket */
case SQLCOM_CALL:
{
sp_head *sp;
/*
This will cache all SP and SF and open and lock all tables
required for execution.
*/
if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
open_and_lock_tables(thd, all_tables))
goto error;
/*
By this moment all needed SPs should be in cache so no need to look
into DB.
*/
if (!(sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
&thd->sp_proc_cache, TRUE)))
{
my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE",
lex->spname->m_qname.str);
goto error;
}
else
{
ha_rows select_limit;
/* bits that should be cleared in thd->server_status */
uint bits_to_be_cleared= 0;
/*
Check that the stored procedure doesn't contain Dynamic SQL
and doesn't return result sets: such stored procedures can't
be called from a function or trigger.
*/
if (thd->in_sub_stmt)
{
const char *where= (thd->in_sub_stmt & SUB_STMT_TRIGGER ?
"trigger" : "function");
if (sp->is_not_allowed_in_function(where))
goto error;
}
my_bool save_no_send_ok= thd->net.no_send_ok;
thd->net.no_send_ok= TRUE;
if (sp->m_flags & sp_head::MULTI_RESULTS)
{
if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
{
/*
The client does not support multiple result sets being sent
back
*/
my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
thd->net.no_send_ok= save_no_send_ok;
goto error;
}
/*
If SERVER_MORE_RESULTS_EXISTS is not set,
then remember that it should be cleared
*/
bits_to_be_cleared= (~thd->server_status &
SERVER_MORE_RESULTS_EXISTS);
thd->server_status|= SERVER_MORE_RESULTS_EXISTS;
}
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (check_routine_access(thd, EXECUTE_ACL,
sp->m_db.str, sp->m_name.str, TRUE, FALSE))
{
thd->net.no_send_ok= save_no_send_ok;
goto error;
}
#endif
select_limit= thd->variables.select_limit;
thd->variables.select_limit= HA_POS_ERROR;
/*
We never write CALL statements into binlog:
- If the mode is non-prelocked, each statement will be logged
separately.
- If the mode is prelocked, the invoking statement will care
about writing into binlog.
So just execute the statement.
*/
res= sp->execute_procedure(thd, &lex->value_list);
/*
If warnings have been cleared, we have to clear total_warn_count
too, otherwise the clients get confused.
*/
if (thd->warn_list.is_empty())
thd->total_warn_count= 0;
thd->variables.select_limit= select_limit;
thd->net.no_send_ok= save_no_send_ok;
thd->server_status&= ~bits_to_be_cleared;
if (!res)
send_ok(thd, (ulong) (thd->row_count_func < 0 ? 0 :
thd->row_count_func));
else
{
DBUG_ASSERT(thd->net.report_error == 1 || thd->killed);
goto error; // Substatement should already have sent error
}
}
break;
}
case SQLCOM_ALTER_PROCEDURE:
case SQLCOM_ALTER_FUNCTION:
{
int sp_result;
sp_head *sp;
st_sp_chistics chistics;
memcpy(&chistics, &lex->sp_chistics, sizeof(chistics));
if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
&thd->sp_proc_cache, FALSE);
else
sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
&thd->sp_func_cache, FALSE);
mysql_reset_errors(thd, 0);
if (! sp)
{
if (lex->spname->m_db.str)
sp_result= SP_KEY_NOT_FOUND;
else
{
my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
goto error;
}
}
else
{
if (check_routine_access(thd, ALTER_PROC_ACL, sp->m_db.str,
sp->m_name.str,
lex->sql_command == SQLCOM_ALTER_PROCEDURE, 0))
goto error;
if (end_active_trans(thd))
goto error;
memcpy(&lex->sp_chistics, &chistics, sizeof(lex->sp_chistics));
if ((sp->m_type == TYPE_ENUM_FUNCTION) &&
!trust_function_creators && mysql_bin_log.is_open() &&
!sp->m_chistics->detistic &&
(chistics.daccess == SP_CONTAINS_SQL ||
chistics.daccess == SP_MODIFIES_SQL_DATA))
{
my_message(ER_BINLOG_UNSAFE_ROUTINE,
ER(ER_BINLOG_UNSAFE_ROUTINE), MYF(0));
sp_result= SP_INTERNAL_ERROR;
}
else
{
/*
Note that if you implement the capability of ALTER FUNCTION to
alter the body of the function, this command should be made to
follow the restrictions that log-bin-trust-function-creators=0
already puts on CREATE FUNCTION.
*/
/* Conditionally writes to binlog */
int type= lex->sql_command == SQLCOM_ALTER_PROCEDURE ?
TYPE_ENUM_PROCEDURE :
TYPE_ENUM_FUNCTION;
sp_result= sp_update_routine(thd,
type,
lex->spname,
&lex->sp_chistics);
}
}
switch (sp_result)
{
case SP_OK:
send_ok(thd);
break;
case SP_KEY_NOT_FOUND:
my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
SP_COM_STRING(lex), lex->spname->m_qname.str);
goto error;
default:
my_error(ER_SP_CANT_ALTER, MYF(0),
SP_COM_STRING(lex), lex->spname->m_qname.str);
goto error;
}
break;
}
case SQLCOM_DROP_PROCEDURE:
case SQLCOM_DROP_FUNCTION:
{
int sp_result;
int type= (lex->sql_command == SQLCOM_DROP_PROCEDURE ?
TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION);
sp_result= sp_routine_exists_in_table(thd, type, lex->spname);
mysql_reset_errors(thd, 0);
if (sp_result == SP_OK)
{
char *db= lex->spname->m_db.str;
char *name= lex->spname->m_name.str;
if (check_routine_access(thd, ALTER_PROC_ACL, db, name,
lex->sql_command == SQLCOM_DROP_PROCEDURE, 0))
goto error;
if (end_active_trans(thd))
goto error;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (sp_automatic_privileges && !opt_noacl &&
sp_revoke_privileges(thd, db, name,
lex->sql_command == SQLCOM_DROP_PROCEDURE))
{
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_PROC_AUTO_REVOKE_FAIL,
ER(ER_PROC_AUTO_REVOKE_FAIL));
}
#endif
/* Conditionally writes to binlog */
int type= lex->sql_command == SQLCOM_DROP_PROCEDURE ?
TYPE_ENUM_PROCEDURE :
TYPE_ENUM_FUNCTION;
sp_result= sp_drop_routine(thd, type, lex->spname);
}
else
{
#ifdef HAVE_DLOPEN
if (lex->sql_command == SQLCOM_DROP_FUNCTION)
{
udf_func *udf = find_udf(lex->spname->m_name.str,
lex->spname->m_name.length);
if (udf)
{
if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 0, 0))
goto error;
if (!(res = mysql_drop_function(thd, &lex->spname->m_name)))
{
send_ok(thd);
break;
}
}
}
#endif
if (lex->spname->m_db.str)
sp_result= SP_KEY_NOT_FOUND;
else
{
my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
goto error;
}
}
res= sp_result;
switch (sp_result) {
case SP_OK:
send_ok(thd);
break;
case SP_KEY_NOT_FOUND:
if (lex->drop_if_exists)
{
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
SP_COM_STRING(lex), lex->spname->m_name.str);
res= FALSE;
send_ok(thd);
break;
}
my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
SP_COM_STRING(lex), lex->spname->m_qname.str);
goto error;
default:
my_error(ER_SP_DROP_FAILED, MYF(0),
SP_COM_STRING(lex), lex->spname->m_qname.str);
goto error;
}
break;
}
case SQLCOM_SHOW_CREATE_PROC:
{
if (sp_show_create_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname))
{
my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
SP_COM_STRING(lex), lex->spname->m_name.str);
goto error;
}
break;
}
case SQLCOM_SHOW_CREATE_FUNC:
{
if (sp_show_create_routine(thd, TYPE_ENUM_FUNCTION, lex->spname))
{
my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
SP_COM_STRING(lex), lex->spname->m_name.str);
goto error;
}
break;
}
#ifdef NOT_USED
case SQLCOM_SHOW_STATUS_PROC:
{
res= sp_show_status_routine(thd, TYPE_ENUM_PROCEDURE,
(lex->wild ? lex->wild->ptr() : NullS));
break;
}
case SQLCOM_SHOW_STATUS_FUNC:
{
res= sp_show_status_routine(thd, TYPE_ENUM_FUNCTION,
(lex->wild ? lex->wild->ptr() : NullS));
break;
}
#endif
#ifndef DBUG_OFF
case SQLCOM_SHOW_PROC_CODE:
case SQLCOM_SHOW_FUNC_CODE:
{
sp_head *sp;
if (lex->sql_command == SQLCOM_SHOW_PROC_CODE)
sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
&thd->sp_proc_cache, FALSE);
else
sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
&thd->sp_func_cache, FALSE);
if (!sp || sp->show_routine_code(thd))
{
/* We don't distinguish between errors for now */
my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
SP_COM_STRING(lex), lex->spname->m_name.str);
goto error;
}
break;
}
#endif // ifndef DBUG_OFF
case SQLCOM_CREATE_VIEW:
{
if (end_active_trans(thd))
goto error;
res= mysql_create_view(thd, first_table, thd->lex->create_view_mode);
break;
}
case SQLCOM_DROP_VIEW:
{
if (check_table_access(thd, DROP_ACL, all_tables, 0) ||
end_active_trans(thd))
goto error;
/* Conditionally writes to binlog. */
res= mysql_drop_view(thd, first_table, thd->lex->drop_mode);
break;
}
case SQLCOM_CREATE_TRIGGER:
{
if (end_active_trans(thd))
goto error;
/* Conditionally writes to binlog. */
res= mysql_create_or_drop_trigger(thd, all_tables, 1);
break;
}
case SQLCOM_DROP_TRIGGER:
{
if (end_active_trans(thd))
goto error;
/* Conditionally writes to binlog. */
res= mysql_create_or_drop_trigger(thd, all_tables, 0);
break;
}
case SQLCOM_XA_START:
if (thd->transaction.xid_state.xa_state == XA_IDLE &&
thd->lex->xa_opt == XA_RESUME)
{
if (! thd->transaction.xid_state.xid.eq(thd->lex->xid))
{
my_error(ER_XAER_NOTA, MYF(0));
break;
}
thd->transaction.xid_state.xa_state=XA_ACTIVE;
send_ok(thd);
break;
}
if (thd->lex->xa_opt != XA_NONE)
{ // JOIN is not supported yet. TODO
my_error(ER_XAER_INVAL, MYF(0));
break;
}
if (thd->transaction.xid_state.xa_state != XA_NOTR)
{
my_error(ER_XAER_RMFAIL, MYF(0),
xa_state_names[thd->transaction.xid_state.xa_state]);
break;
}
if (thd->active_transaction() || thd->locked_tables)
{
my_error(ER_XAER_OUTSIDE, MYF(0));
break;
}
if (xid_cache_search(thd->lex->xid))
{
my_error(ER_XAER_DUPID, MYF(0));
break;
}
DBUG_ASSERT(thd->transaction.xid_state.xid.is_null());
thd->transaction.xid_state.xa_state=XA_ACTIVE;
thd->transaction.xid_state.xid.set(thd->lex->xid);
xid_cache_insert(&thd->transaction.xid_state);
thd->options= ((thd->options & ~(OPTION_KEEP_LOG)) | OPTION_BEGIN);
thd->no_trans_update.all= FALSE;
thd->server_status|= SERVER_STATUS_IN_TRANS;
send_ok(thd);
break;
case SQLCOM_XA_END:
/* fake it */
if (thd->lex->xa_opt != XA_NONE)
{ // SUSPEND and FOR MIGRATE are not supported yet. TODO
my_error(ER_XAER_INVAL, MYF(0));
break;
}
if (thd->transaction.xid_state.xa_state != XA_ACTIVE)
{
my_error(ER_XAER_RMFAIL, MYF(0),
xa_state_names[thd->transaction.xid_state.xa_state]);
break;
}
if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
{
my_error(ER_XAER_NOTA, MYF(0));
break;
}
thd->transaction.xid_state.xa_state=XA_IDLE;
send_ok(thd);
break;
case SQLCOM_XA_PREPARE:
if (thd->transaction.xid_state.xa_state != XA_IDLE)
{
my_error(ER_XAER_RMFAIL, MYF(0),
xa_state_names[thd->transaction.xid_state.xa_state]);
break;
}
if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
{
my_error(ER_XAER_NOTA, MYF(0));
break;
}
if (ha_prepare(thd))
{
my_error(ER_XA_RBROLLBACK, MYF(0));
xid_cache_delete(&thd->transaction.xid_state);
thd->transaction.xid_state.xa_state=XA_NOTR;
break;
}
thd->transaction.xid_state.xa_state=XA_PREPARED;
send_ok(thd);
break;
case SQLCOM_XA_COMMIT:
if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
{
XID_STATE *xs=xid_cache_search(thd->lex->xid);
if (!xs || xs->in_thd)
my_error(ER_XAER_NOTA, MYF(0));
else
{
ha_commit_or_rollback_by_xid(thd->lex->xid, 1);
xid_cache_delete(xs);
send_ok(thd);
}
break;
}
if (thd->transaction.xid_state.xa_state == XA_IDLE &&
thd->lex->xa_opt == XA_ONE_PHASE)
{
int r;
if ((r= ha_commit(thd)))
my_error(r == 1 ? ER_XA_RBROLLBACK : ER_XAER_RMERR, MYF(0));
else
send_ok(thd);
}
else if (thd->transaction.xid_state.xa_state == XA_PREPARED &&
thd->lex->xa_opt == XA_NONE)
{
if (wait_if_global_read_lock(thd, 0, 0))
{
ha_rollback(thd);
my_error(ER_XAER_RMERR, MYF(0));
}
else
{
if (ha_commit_one_phase(thd, 1))
my_error(ER_XAER_RMERR, MYF(0));
else
send_ok(thd);
start_waiting_global_read_lock(thd);
}
}
else
{
my_error(ER_XAER_RMFAIL, MYF(0),
xa_state_names[thd->transaction.xid_state.xa_state]);
break;
}
thd->options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
thd->no_trans_update.all= FALSE;
thd->server_status&= ~SERVER_STATUS_IN_TRANS;
xid_cache_delete(&thd->transaction.xid_state);
thd->transaction.xid_state.xa_state=XA_NOTR;
break;
case SQLCOM_XA_ROLLBACK:
if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
{
XID_STATE *xs=xid_cache_search(thd->lex->xid);
if (!xs || xs->in_thd)
my_error(ER_XAER_NOTA, MYF(0));
else
{
ha_commit_or_rollback_by_xid(thd->lex->xid, 0);
xid_cache_delete(xs);
send_ok(thd);
}
break;
}
if (thd->transaction.xid_state.xa_state != XA_IDLE &&
thd->transaction.xid_state.xa_state != XA_PREPARED)
{
my_error(ER_XAER_RMFAIL, MYF(0),
xa_state_names[thd->transaction.xid_state.xa_state]);
break;
}
if (ha_rollback(thd))
my_error(ER_XAER_RMERR, MYF(0));
else
send_ok(thd);
thd->options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
thd->no_trans_update.all= FALSE;
thd->server_status&= ~SERVER_STATUS_IN_TRANS;
xid_cache_delete(&thd->transaction.xid_state);
thd->transaction.xid_state.xa_state=XA_NOTR;
break;
case SQLCOM_XA_RECOVER:
res= mysql_xa_recover(thd);
break;
case SQLCOM_ALTER_TABLESPACE:
if (check_access(thd, ALTER_ACL, thd->db, 0, 1, 0, thd->db ? is_schema_db(thd->db) : 0))
break;
if (!(res= mysql_alter_tablespace(thd, lex->alter_tablespace_info)))
send_ok(thd);
break;
case SQLCOM_INSTALL_PLUGIN:
if (! (res= mysql_install_plugin(thd, &thd->lex->comment,
&thd->lex->ident)))
send_ok(thd);
break;
case SQLCOM_UNINSTALL_PLUGIN:
if (! (res= mysql_uninstall_plugin(thd, &thd->lex->comment)))
send_ok(thd);
break;
case SQLCOM_BINLOG_BASE64_EVENT:
{
#ifndef EMBEDDED_LIBRARY
mysql_client_binlog_statement(thd);
#else /* EMBEDDED_LIBRARY */
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "embedded");
#endif /* EMBEDDED_LIBRARY */
break;
}
case SQLCOM_CREATE_SERVER:
{
int error;
LEX *lex= thd->lex;
DBUG_PRINT("info", ("case SQLCOM_CREATE_SERVER"));
if (check_global_access(thd, SUPER_ACL))
break;
if ((error= create_server(thd, &lex->server_options)))
{
DBUG_PRINT("info", ("problem creating server <%s>",
lex->server_options.server_name));
my_error(error, MYF(0), lex->server_options.server_name);
break;
}
send_ok(thd, 1);
break;
}
case SQLCOM_ALTER_SERVER:
{
int error;
LEX *lex= thd->lex;
DBUG_PRINT("info", ("case SQLCOM_ALTER_SERVER"));
if (check_global_access(thd, SUPER_ACL))
break;
if ((error= alter_server(thd, &lex->server_options)))
{
DBUG_PRINT("info", ("problem altering server <%s>",
lex->server_options.server_name));
my_error(error, MYF(0), lex->server_options.server_name);
break;
}
send_ok(thd, 1);
break;
}
case SQLCOM_DROP_SERVER:
{
int err_code;
LEX *lex= thd->lex;
DBUG_PRINT("info", ("case SQLCOM_DROP_SERVER"));
if (check_global_access(thd, SUPER_ACL))
break;
if ((err_code= drop_server(thd, &lex->server_options)))
{
if (! lex->drop_if_exists && err_code == ER_FOREIGN_SERVER_DOESNT_EXIST)
{
DBUG_PRINT("info", ("problem dropping server %s",
lex->server_options.server_name));
my_error(err_code, MYF(0), lex->server_options.server_name);
}
else
{
send_ok(thd, 0);
}
break;
}
send_ok(thd, 1);
break;
}
default:
#ifndef EMBEDDED_LIBRARY
DBUG_ASSERT(0); /* Impossible */
#endif
send_ok(thd);
break;
}
thd->proc_info="query end";
/*
Binlog-related cleanup:
Reset system variables temporarily modified by SET ONE SHOT.
Exception: If this is a SET, do nothing. This is to allow
mysqlbinlog to print many SET commands (in this case we want the
charset temp setting to live until the real query). This is also
needed so that SET CHARACTER_SET_CLIENT... does not cancel itself
immediately.
*/
if (thd->one_shot_set && lex->sql_command != SQLCOM_SET_OPTION)
reset_one_shot_variables(thd);
/*
The return value for ROW_COUNT() is "implementation dependent" if the
statement is not DELETE, INSERT or UPDATE, but -1 is what JDBC and ODBC
wants. We also keep the last value in case of SQLCOM_CALL or
SQLCOM_EXECUTE.
*/
if (!(sql_command_flags[lex->sql_command] & CF_HAS_ROW_COUNT))
thd->row_count_func= -1;
goto finish;
error:
res= TRUE;
finish:
if (need_start_waiting)
{
/*
Release the protection against the global read lock and wake
everyone, who might want to set a global read lock.
*/
start_waiting_global_read_lock(thd);
}
DBUG_RETURN(res || thd->net.report_error);
}
static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables)
{
LEX *lex= thd->lex;
select_result *result=lex->result;
bool res;
/* assign global limit variable if limit is not given */
{
SELECT_LEX *param= lex->unit.global_parameters;
if (!param->explicit_limit)
param->select_limit=
new Item_int((ulonglong) thd->variables.select_limit);
}
if (!(res= open_and_lock_tables(thd, all_tables)))
{
if (lex->describe)
{
/*
We always use select_send for EXPLAIN, even if it's an EXPLAIN
for SELECT ... INTO OUTFILE: a user application should be able
to prepend EXPLAIN to any query and receive output for it,
even if the query itself redirects the output.
*/
if (!(result= new select_send()))
return 1; /* purecov: inspected */
thd->send_explain_fields(result);
res= mysql_explain_union(thd, &thd->lex->unit, result);
if (lex->describe & DESCRIBE_EXTENDED)
{
char buff[1024];
String str(buff,(uint32) sizeof(buff), system_charset_info);
str.length(0);
thd->lex->unit.print(&str);
str.append('\0');
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_YES, str.ptr());
}
result->send_eof();
delete result;
}
else
{
if (!result && !(result= new select_send()))
return 1; /* purecov: inspected */
query_cache_store_query(thd, all_tables);
res= handle_select(thd, lex, result, 0);
if (result != lex->result)
delete result;
}
}
return res;
}
/*
Check grants for commands which work only with one table.
SYNOPSIS
check_single_table_access()
thd Thread handler
privilege requested privilege
all_tables global table list of query
no_errors FALSE/TRUE - report/don't report error to
the client (using my_error() call).
RETURN
0 - OK
1 - access denied, error is sent to client
*/
bool check_single_table_access(THD *thd, ulong privilege,
TABLE_LIST *all_tables, bool no_errors)
{
Security_context * backup_ctx= thd->security_ctx;
/* we need to switch to the saved context (if any) */
if (all_tables->security_ctx)
thd->security_ctx= all_tables->security_ctx;
const char *db_name;
if ((all_tables->view || all_tables->field_translation) &&
!all_tables->schema_table)
db_name= all_tables->view_db.str;
else
db_name= all_tables->db;
if (check_access(thd, privilege, db_name,
&all_tables->grant.privilege, 0, no_errors,
test(all_tables->schema_table)))
goto deny;
/* Show only 1 table for check_grant */
if (!(all_tables->belong_to_view &&
(thd->lex->sql_command == SQLCOM_SHOW_FIELDS)) &&
check_grant(thd, privilege, all_tables, 0, 1, no_errors))
goto deny;
thd->security_ctx= backup_ctx;
return 0;
deny:
thd->security_ctx= backup_ctx;
return 1;
}
/*
Check grants for commands which work only with one table and all other
tables belonging to subselects or implicitly opened tables.
SYNOPSIS
check_one_table_access()
thd Thread handler
privilege requested privilege
all_tables global table list of query
RETURN
0 - OK
1 - access denied, error is sent to client
*/
bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables)
{
if (check_single_table_access (thd,privilege,all_tables, FALSE))
return 1;
/* Check rights on tables of subselects and implictly opened tables */
TABLE_LIST *subselects_tables, *view= all_tables->view ? all_tables : 0;
if ((subselects_tables= all_tables->next_global))
{
/*
Access rights asked for the first table of a view should be the same
as for the view
*/
if (view && subselects_tables->belong_to_view == view)
{
if (check_single_table_access (thd, privilege, subselects_tables, FALSE))
return 1;
subselects_tables= subselects_tables->next_global;
}
if (subselects_tables &&
(check_table_access(thd, SELECT_ACL, subselects_tables, 0)))
return 1;
}
return 0;
}
/****************************************************************************
Get the user (global) and database privileges for all used tables
NOTES
The idea of EXTRA_ACL is that one will be granted access to the table if
one has the asked privilege on any column combination of the table; For
example to be able to check a table one needs to have SELECT privilege on
any column of the table.
RETURN
0 ok
1 If we can't get the privileges and we don't use table/column grants.
save_priv In this we store global and db level grants for the table
Note that we don't store db level grants if the global grants
is enough to satisfy the request and the global grants contains
a SELECT grant.
****************************************************************************/
bool
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
bool dont_check_global_grants, bool no_errors, bool schema_db)
{
Security_context *sctx= thd->security_ctx;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
ulong db_access;
bool db_is_pattern= test(want_access & GRANT_ACL);
#endif
ulong dummy;
DBUG_ENTER("check_access");
DBUG_PRINT("enter",("db: %s want_access: %lu master_access: %lu",
db ? db : "", want_access, sctx->master_access));
if (save_priv)
*save_priv=0;
else
save_priv= &dummy;
if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
{
DBUG_PRINT("error",("No database"));
if (!no_errors)
my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
MYF(0)); /* purecov: tested */
DBUG_RETURN(TRUE); /* purecov: tested */
}
if (schema_db)
{
if (!(sctx->master_access & FILE_ACL) && (want_access & FILE_ACL) ||
(want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL)))
{
if (!no_errors)
{
const char *db_name= db ? db : thd->db;
my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
sctx->priv_user, sctx->priv_host, db_name);
}
DBUG_RETURN(TRUE);
}
else
{
*save_priv= SELECT_ACL;
DBUG_RETURN(FALSE);
}
}
#ifdef NO_EMBEDDED_ACCESS_CHECKS
DBUG_RETURN(0);
#else
if ((sctx->master_access & want_access) == want_access)
{
/*
If we don't have a global SELECT privilege, we have to get the database
specific access rights to be able to handle queries of type
UPDATE t1 SET a=1 WHERE b > 0
*/
db_access= sctx->db_access;
if (!(sctx->master_access & SELECT_ACL) &&
(db && (!thd->db || db_is_pattern || strcmp(db,thd->db))))
db_access=acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
db_is_pattern);
*save_priv=sctx->master_access | db_access;
DBUG_RETURN(FALSE);
}
if (((want_access & ~sctx->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
! db && dont_check_global_grants)
{ // We can never grant this
DBUG_PRINT("error",("No possible access"));
if (!no_errors)
my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
sctx->priv_user,
sctx->priv_host,
(thd->password ?
ER(ER_YES) :
ER(ER_NO))); /* purecov: tested */
DBUG_RETURN(TRUE); /* purecov: tested */
}
if (db == any_db)
DBUG_RETURN(FALSE); // Allow select on anything
if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
db_access= acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
db_is_pattern);
else
db_access= sctx->db_access;
DBUG_PRINT("info",("db_access: %lu", db_access));
/* Remove SHOW attribute and access rights we already have */
want_access &= ~(sctx->master_access | EXTRA_ACL);
DBUG_PRINT("info",("db_access: %lu want_access: %lu",
db_access, want_access));
db_access= ((*save_priv=(db_access | sctx->master_access)) & want_access);
if (db_access == want_access ||
(!dont_check_global_grants &&
!(want_access & ~(db_access | TABLE_ACLS | PROC_ACLS))))
DBUG_RETURN(FALSE); /* Ok */
DBUG_PRINT("error",("Access denied"));
if (!no_errors)
my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
sctx->priv_user, sctx->priv_host,
(db ? db : (thd->db ?
thd->db :
"unknown"))); /* purecov: tested */
DBUG_RETURN(TRUE); /* purecov: tested */
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
/*
check for global access and give descriptive error message if it fails
SYNOPSIS
check_global_access()
thd Thread handler
want_access Use should have any of these global rights
WARNING
One gets access right if one has ANY of the rights in want_access
This is useful as one in most cases only need one global right,
but in some case we want to check if the user has SUPER or
REPL_CLIENT_ACL rights.
RETURN
0 ok
1 Access denied. In this case an error is sent to the client
*/
bool check_global_access(THD *thd, ulong want_access)
{
#ifdef NO_EMBEDDED_ACCESS_CHECKS
return 0;
#else
char command[128];
if ((thd->security_ctx->master_access & want_access))
return 0;
get_privilege_desc(command, sizeof(command), want_access);
my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), command);
return 1;
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
static bool check_show_access(THD *thd, TABLE_LIST *table)
{
switch (get_schema_table_idx(table->schema_table)) {
case SCH_SCHEMATA:
return (specialflag & SPECIAL_SKIP_SHOW_DB) &&
check_global_access(thd, SHOW_DB_ACL);
case SCH_TABLE_NAMES:
case SCH_TABLES:
case SCH_VIEWS:
case SCH_TRIGGERS:
case SCH_EVENTS:
{
const char *dst_db_name= table->schema_select_lex->db;
DBUG_ASSERT(dst_db_name);
if (check_access(thd, SELECT_ACL, dst_db_name,
&thd->col_access, FALSE, FALSE,
is_schema_db(dst_db_name)))
return TRUE;
if (!thd->col_access && check_grant_db(thd, dst_db_name))
{
my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
thd->security_ctx->priv_user,
thd->security_ctx->priv_host,
dst_db_name);
return TRUE;
}
return FALSE;
}
case SCH_COLUMNS:
case SCH_STATISTICS:
{
TABLE_LIST *dst_table;
dst_table= (TABLE_LIST *) table->schema_select_lex->table_list.first;
DBUG_ASSERT(dst_table);
if (check_access(thd, SELECT_ACL | EXTRA_ACL,
dst_table->db,
&dst_table->grant.privilege,
FALSE, FALSE,
test(dst_table->schema_table)))
return FALSE;
return (check_grant(thd, SELECT_ACL, dst_table, 2, UINT_MAX, FALSE));
}
default:
break;
}
return FALSE;
}
/*
Check the privilege for all used tables.
SYNOPSYS
check_table_access()
thd Thread context
want_access Privileges requested
tables List of tables to be checked
no_errors FALSE/TRUE - report/don't report error to
the client (using my_error() call).
NOTES
Table privileges are cached in the table list for GRANT checking.
This functions assumes that table list used and
thd->lex->query_tables_own_last value correspond to each other
(the latter should be either 0 or point to next_global member
of one of elements of this table list).
RETURN VALUE
FALSE - OK
TRUE - Access denied
*/
bool
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
bool no_errors)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
TABLE_LIST *org_tables= tables;
#endif
TABLE_LIST *first_not_own_table= thd->lex->first_not_own_table();
Security_context *sctx= thd->security_ctx, *backup_ctx= thd->security_ctx;
/*
The check that first_not_own_table is not reached is for the case when
the given table list refers to the list for prelocking (contains tables
of other queries). For simple queries first_not_own_table is 0.
*/
for (; tables != first_not_own_table; tables= tables->next_global)
{
if (tables->security_ctx)
sctx= tables->security_ctx;
else
sctx= backup_ctx;
if (tables->schema_table &&
(want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL)))
{
if (!no_errors)
my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
sctx->priv_user, sctx->priv_host,
INFORMATION_SCHEMA_NAME.str);
return TRUE;
}
/*
Register access for view underlying table.
Remove SHOW_VIEW_ACL, because it will be checked during making view
*/
tables->grant.orig_want_privilege= (want_access & ~SHOW_VIEW_ACL);
if (tables->schema_table_reformed)
{
if (check_show_access(thd, tables))
goto deny;
continue;
}
if (tables->derived ||
(tables->table && (int)tables->table->s->tmp_table))
continue;
thd->security_ctx= sctx;
if ((sctx->master_access & want_access) ==
(want_access & ~EXTRA_ACL) &&
thd->db)
tables->grant.privilege= want_access;
else if (tables->db && thd->db && strcmp(tables->db, thd->db) == 0)
{
if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
0, no_errors, test(tables->schema_table)))
goto deny; // Access denied
}
else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
0, no_errors, test(tables->schema_table)))
goto deny;
}
thd->security_ctx= backup_ctx;
return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
test(want_access & EXTRA_ACL), UINT_MAX, no_errors);
deny:
thd->security_ctx= backup_ctx;
return TRUE;
}
bool
check_routine_access(THD *thd, ulong want_access,char *db, char *name,
bool is_proc, bool no_errors)
{
TABLE_LIST tables[1];
bzero((char *)tables, sizeof(TABLE_LIST));
tables->db= db;
tables->table_name= tables->alias= name;
/*
The following test is just a shortcut for check_access() (to avoid
calculating db_access) under the assumption that it's common to
give persons global right to execute all stored SP (but not
necessary to create them).
*/
if ((thd->security_ctx->master_access & want_access) == want_access)
tables->grant.privilege= want_access;
else if (check_access(thd,want_access,db,&tables->grant.privilege,
0, no_errors, 0))
return TRUE;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
return check_grant_routine(thd, want_access, tables, is_proc, no_errors);
#else
return FALSE;
#endif
}
/*
Check if the routine has any of the routine privileges
SYNOPSIS
check_some_routine_access()
thd Thread handler
db Database name
name Routine name
RETURN
0 ok
1 error
*/
bool check_some_routine_access(THD *thd, const char *db, const char *name,
bool is_proc)
{
ulong save_priv;
if (thd->security_ctx->master_access & SHOW_PROC_ACLS)
return FALSE;
/*
There are no routines in information_schema db. So we can safely
pass zero to last paramter of check_access function
*/
if (!check_access(thd, SHOW_PROC_ACLS, db, &save_priv, 0, 1, 0) ||
(save_priv & SHOW_PROC_ACLS))
return FALSE;
return check_routine_level_acl(thd, db, name, is_proc);
}
/*
Check if the given table has any of the asked privileges
SYNOPSIS
check_some_access()
thd Thread handler
want_access Bitmap of possible privileges to check for
RETURN
0 ok
1 error
*/
bool check_some_access(THD *thd, ulong want_access, TABLE_LIST *table)
{
ulong access;
DBUG_ENTER("check_some_access");
/* This loop will work as long as we have less than 32 privileges */
for (access= 1; access < want_access ; access<<= 1)
{
if (access & want_access)
{
if (!check_access(thd, access, table->db,
&table->grant.privilege, 0, 1,
test(table->schema_table)) &&
!check_grant(thd, access, table, 0, 1, 1))
DBUG_RETURN(0);
}
}
DBUG_PRINT("exit",("no matching access rights"));
DBUG_RETURN(1);
}
bool check_merge_table_access(THD *thd, char *db,
TABLE_LIST *table_list)
{
int error=0;
if (table_list)
{
/* Check that all tables use the current database */
TABLE_LIST *tmp;
for (tmp= table_list; tmp; tmp= tmp->next_local)
{
if (!tmp->db || !tmp->db[0])
tmp->db=db;
}
error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
table_list,0);
}
return error;
}
/****************************************************************************
Check stack size; Send error if there isn't enough stack to continue
****************************************************************************/
#if STACK_DIRECTION < 0
#define used_stack(A,B) (long) (A - B)
#else
#define used_stack(A,B) (long) (B - A)
#endif
#ifndef DBUG_OFF
long max_stack_used;
#endif
#ifndef EMBEDDED_LIBRARY
/*
Note: The 'buf' parameter is necessary, even if it is unused here.
- fix_fields functions has a "dummy" buffer large enough for the
corresponding exec. (Thus we only have to check in fix_fields.)
- Passing to check_stack_overrun() prevents the compiler from removing it.
*/
bool check_stack_overrun(THD *thd, long margin,
uchar *buf __attribute__((unused)))
{
long stack_used;
DBUG_ASSERT(thd == current_thd);
if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
(long) (thread_stack - margin))
{
sprintf(errbuff[0],ER(ER_STACK_OVERRUN_NEED_MORE),
stack_used,thread_stack,margin);
my_message(ER_STACK_OVERRUN_NEED_MORE,errbuff[0],MYF(0));
thd->fatal_error();
return 1;
}
#ifndef DBUG_OFF
max_stack_used= max(max_stack_used, stack_used);
#endif
return 0;
}
#endif /* EMBEDDED_LIBRARY */
#define MY_YACC_INIT 1000 // Start with big alloc
#define MY_YACC_MAX 32000 // Because of 'short'
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
{
LEX *lex= current_thd->lex;
ulong old_info=0;
if ((uint) *yystacksize >= MY_YACC_MAX)
return 1;
if (!lex->yacc_yyvs)
old_info= *yystacksize;
*yystacksize= set_zone((*yystacksize)*2,MY_YACC_INIT,MY_YACC_MAX);
if (!(lex->yacc_yyvs= (uchar*)
my_realloc(lex->yacc_yyvs,
*yystacksize*sizeof(**yyvs),
MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))) ||
!(lex->yacc_yyss= (uchar*)
my_realloc(lex->yacc_yyss,
*yystacksize*sizeof(**yyss),
MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))))
return 1;
if (old_info)
{ // Copy old info from stack
memcpy(lex->yacc_yyss, (uchar*) *yyss, old_info*sizeof(**yyss));
memcpy(lex->yacc_yyvs, (uchar*) *yyvs, old_info*sizeof(**yyvs));
}
*yyss=(short*) lex->yacc_yyss;
*yyvs=(YYSTYPE*) lex->yacc_yyvs;
return 0;
}
/*
Reset THD part responsible for command processing state.
DESCRIPTION
This needs to be called before execution of every statement
(prepared or conventional).
It is not called by substatements of routines.
TODO
Make it a method of THD and align its name with the rest of
reset/end/start/init methods.
Call it after we use THD for queries, not before.
*/
void mysql_reset_thd_for_next_command(THD *thd)
{
DBUG_ENTER("mysql_reset_thd_for_next_command");
DBUG_ASSERT(!thd->spcont); /* not for substatements of routines */
thd->free_list= 0;
thd->select_number= 1;
/*
Those two lines below are theoretically unneeded as
THD::cleanup_after_query() should take care of this already.
*/
thd->auto_inc_intervals_in_cur_stmt_for_binlog.empty();
thd->stmt_depends_on_first_successful_insert_id_in_prev_stmt= 0;
thd->query_start_used= 0;
thd->is_fatal_error= thd->time_zone_used= 0;
thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS |
SERVER_QUERY_NO_INDEX_USED |
SERVER_QUERY_NO_GOOD_INDEX_USED);
/*
If in autocommit mode and not in a transaction, reset
OPTION_STATUS_NO_TRANS_UPDATE | OPTION_KEEP_LOG to not get warnings
in ha_rollback_trans() about some tables couldn't be rolled back.
*/
if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))
{
thd->options&= ~OPTION_KEEP_LOG;
thd->no_trans_update.all= FALSE;
}
DBUG_ASSERT(thd->security_ctx== &thd->main_security_ctx);
thd->tmp_table_used= 0;
if (!thd->in_sub_stmt)
{
if (opt_bin_log)
{
reset_dynamic(&thd->user_var_events);
thd->user_var_events_alloc= thd->mem_root;
}
thd->clear_error();
thd->total_warn_count=0; // Warnings for this query
thd->rand_used= 0;
thd->sent_row_count= thd->examined_row_count= 0;
}
/*
Because we come here only for start of top-statements, binlog format is
constant inside a complex statement (using stored functions) etc.
*/
thd->reset_current_stmt_binlog_row_based();
DBUG_VOID_RETURN;
}
void
mysql_init_select(LEX *lex)
{
SELECT_LEX *select_lex= lex->current_select;
select_lex->init_select();
lex->wild= 0;
if (select_lex == &lex->select_lex)
{
DBUG_ASSERT(lex->result == 0);
lex->exchange= 0;
}
}
bool
mysql_new_select(LEX *lex, bool move_down)
{
SELECT_LEX *select_lex;
THD *thd= lex->thd;
DBUG_ENTER("mysql_new_select");
if (!(select_lex= new (thd->mem_root) SELECT_LEX()))
DBUG_RETURN(1);
select_lex->select_number= ++thd->select_number;
select_lex->parent_lex= lex; /* Used in init_query. */
select_lex->init_query();
select_lex->init_select();
lex->nest_level++;
select_lex->nest_level= lex->nest_level;
/*
Don't evaluate this subquery during statement prepare even if
it's a constant one. The flag is switched off in the end of
mysql_stmt_prepare.
*/
if (thd->stmt_arena->is_stmt_prepare())
select_lex->uncacheable|= UNCACHEABLE_PREPARE;
if (move_down)
{
SELECT_LEX_UNIT *unit;
lex->subqueries= TRUE;
/* first select_lex of subselect or derived table */
if (!(unit= new (thd->mem_root) SELECT_LEX_UNIT()))
DBUG_RETURN(1);
unit->init_query();
unit->init_select();
unit->thd= thd;
unit->include_down(lex->current_select);
unit->link_next= 0;
unit->link_prev= 0;
unit->return_to= lex->current_select;
select_lex->include_down(unit);
/*
By default we assume that it is usual subselect and we have outer name
resolution context, if no we will assign it to 0 later
*/
select_lex->context.outer_context= &select_lex->outer_select()->context;
}
else
{
if (lex->current_select->order_list.first && !lex->current_select->braces)
{
my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY");
DBUG_RETURN(1);
}
select_lex->include_neighbour(lex->current_select);
SELECT_LEX_UNIT *unit= select_lex->master_unit();
if (!unit->fake_select_lex && unit->add_fake_select_lex(lex->thd))
DBUG_RETURN(1);
select_lex->context.outer_context=
unit->first_select()->context.outer_context;
}
select_lex->master_unit()->global_parameters= select_lex;
select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
lex->current_select= select_lex;
/*
in subquery is SELECT query and we allow resolution of names in SELECT
list
*/
select_lex->context.resolve_in_select_list= TRUE;
DBUG_RETURN(0);
}
/*
Create a select to return the same output as 'SELECT @@var_name'.
SYNOPSIS
create_select_for_variable()
var_name Variable name
DESCRIPTION
Used for SHOW COUNT(*) [ WARNINGS | ERROR]
This will crash with a core dump if the variable doesn't exists
*/
void create_select_for_variable(const char *var_name)
{
THD *thd;
LEX *lex;
LEX_STRING tmp, null_lex_string;
Item *var;
char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end;
DBUG_ENTER("create_select_for_variable");
thd= current_thd;
lex= thd->lex;
mysql_init_select(lex);
lex->sql_command= SQLCOM_SELECT;
tmp.str= (char*) var_name;
tmp.length=strlen(var_name);
bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
/*
We set the name of Item to @@session.var_name because that then is used
as the column name in the output.
*/
if ((var= get_system_var(thd, OPT_SESSION, tmp, null_lex_string)))
{
end= strxmov(buff, "@@session.", var_name, NullS);
var->set_name(buff, end-buff, system_charset_info);
add_item_to_list(thd, var);
}
DBUG_VOID_RETURN;
}
void mysql_init_multi_delete(LEX *lex)
{
lex->sql_command= SQLCOM_DELETE_MULTI;
mysql_init_select(lex);
lex->select_lex.select_limit= 0;
lex->unit.select_limit_cnt= HA_POS_ERROR;
lex->select_lex.table_list.save_and_clear(&lex->auxiliary_table_list);
lex->lock_option= using_update_log ? TL_READ_NO_INSERT : TL_READ;
lex->query_tables= 0;
lex->query_tables_last= &lex->query_tables;
}
/*
When you modify mysql_parse(), you may need to mofify
mysql_test_parse_for_slave() in this same file.
*/
/**
Parse a query.
@param thd Current thread
@param inBuf Begining of the query text
@param length Length of the query text
@param [out] semicolon For multi queries, position of the character of
the next query in the query text.
*/
void mysql_parse(THD *thd, const char *inBuf, uint length,
const char ** found_semicolon)
{
DBUG_ENTER("mysql_parse");
DBUG_EXECUTE_IF("parser_debug", turn_parser_debug_on(););
/*
Warning.
The purpose of query_cache_send_result_to_client() is to lookup the
query in the query cache first, to avoid parsing and executing it.
So, the natural implementation would be to:
- first, call query_cache_send_result_to_client,
- second, if caching failed, initialise the lexical and syntactic parser.
The problem is that the query cache depends on a clean initialization
of (among others) lex->safe_to_cache_query and thd->server_status,
which are reset respectively in
- lex_start()
- mysql_reset_thd_for_next_command()
So, initializing the lexical analyser *before* using the query cache
is required for the cache to work properly.
FIXME: cleanup the dependencies in the code to simplify this.
*/
lex_start(thd);
mysql_reset_thd_for_next_command(thd);
if (query_cache_send_result_to_client(thd, (char*) inBuf, length) <= 0)
{
LEX *lex= thd->lex;
sp_cache_flush_obsolete(&thd->sp_proc_cache);
sp_cache_flush_obsolete(&thd->sp_func_cache);
Lex_input_stream lip(thd, inBuf, length);
thd->m_lip= &lip;
int err= MYSQLparse(thd);
*found_semicolon= lip.found_semicolon;
if (!err && ! thd->is_fatal_error)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (mqh_used && thd->user_connect &&
check_mqh(thd, lex->sql_command))
{
thd->net.error = 0;
}
else
#endif
{
if (! thd->net.report_error)
{
/*
Binlog logs a string starting from thd->query and having length
thd->query_length; so we set thd->query_length correctly (to not
log several statements in one event, when we executed only first).
We set it to not see the ';' (otherwise it would get into binlog
and Query_log_event::print() would give ';;' output).
This also helps display only the current query in SHOW
PROCESSLIST.
Note that we don't need LOCK_thread_count to modify query_length.
*/
if (lip.found_semicolon &&
(thd->query_length= (ulong)(lip.found_semicolon - thd->query)))
thd->query_length--;
/* Actually execute the query */
mysql_execute_command(thd);
query_cache_end_of_result(thd);
}
}
}
else
{
DBUG_ASSERT(thd->net.report_error);
DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
thd->is_fatal_error));
query_cache_abort(&thd->net);
}
if (thd->lex->sphead)
{
delete thd->lex->sphead;
thd->lex->sphead= 0;
}
lex->unit.cleanup();
thd->proc_info="freeing items";
thd->end_statement();
thd->cleanup_after_query();
DBUG_ASSERT(thd->change_list.is_empty());
}
else
{
/* There are no multi queries in the cache. */
*found_semicolon= NULL;
}
DBUG_VOID_RETURN;
}
#ifdef HAVE_REPLICATION
/*
Usable by the replication SQL thread only: just parse a query to know if it
can be ignored because of replicate-*-table rules.
RETURN VALUES
0 cannot be ignored
1 can be ignored
*/
bool mysql_test_parse_for_slave(THD *thd, char *inBuf, uint length)
{
LEX *lex= thd->lex;
bool error= 0;
DBUG_ENTER("mysql_test_parse_for_slave");
Lex_input_stream lip(thd, inBuf, length);
thd->m_lip= &lip;
lex_start(thd);
mysql_reset_thd_for_next_command(thd);
int err= MYSQLparse((void*) thd);
if (!err && ! thd->is_fatal_error &&
all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
error= 1; /* Ignore question */
thd->end_statement();
thd->cleanup_after_query();
DBUG_RETURN(error);
}
#endif
/*****************************************************************************
** Store field definition for create
** Return 0 if ok
******************************************************************************/
bool add_field_to_list(THD *thd, LEX_STRING *field_name, enum_field_types type,
char *length, char *decimals,
uint type_modifier,
Item *default_value, Item *on_update_value,
LEX_STRING *comment,
char *change,
List<String> *interval_list, CHARSET_INFO *cs,
uint uint_geom_type)
{
register create_field *new_field;
LEX *lex= thd->lex;
DBUG_ENTER("add_field_to_list");
if (check_string_char_length(field_name, "", NAME_CHAR_LEN,
system_charset_info, 1))
{
my_error(ER_TOO_LONG_IDENT, MYF(0), field_name->str); /* purecov: inspected */
DBUG_RETURN(1); /* purecov: inspected */
}
if (type_modifier & PRI_KEY_FLAG)
{
Key *key;
lex->col_list.push_back(new key_part_spec(field_name->str, 0));
key= new Key(Key::PRIMARY, NullS,
&default_key_create_info,
0, lex->col_list);
lex->alter_info.key_list.push_back(key);
lex->col_list.empty();
}
if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
{
Key *key;
lex->col_list.push_back(new key_part_spec(field_name->str, 0));
key= new Key(Key::UNIQUE, NullS,
&default_key_create_info, 0,
lex->col_list);
lex->alter_info.key_list.push_back(key);
lex->col_list.empty();
}
if (default_value)
{
/*
Default value should be literal => basic constants =>
no need fix_fields()
We allow only one function as part of default value -
NOW() as default for TIMESTAMP type.
*/
if (default_value->type() == Item::FUNC_ITEM &&
!(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
type == MYSQL_TYPE_TIMESTAMP))
{
my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
DBUG_RETURN(1);
}
else if (default_value->type() == Item::NULL_ITEM)
{
default_value= 0;
if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
NOT_NULL_FLAG)
{
my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
DBUG_RETURN(1);
}
}
else if (type_modifier & AUTO_INCREMENT_FLAG)
{
my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
DBUG_RETURN(1);
}
}
if (on_update_value && type != MYSQL_TYPE_TIMESTAMP)
{
my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name->str);
DBUG_RETURN(1);
}
if (type == MYSQL_TYPE_TIMESTAMP && length)
{
/* Display widths are no longer supported for TIMSTAMP as of MySQL 4.1.
In other words, for declarations such as TIMESTAMP(2), TIMESTAMP(4),
and so on, the display width is ignored.
*/
char buf[32];
my_snprintf(buf, sizeof(buf), "TIMESTAMP(%s)", length);
WARN_DEPRECATED(thd, "5.2", buf, "'TIMESTAMP'");
}
if (!(new_field= new create_field()) ||
new_field->init(thd, field_name->str, type, length, decimals, type_modifier,
default_value, on_update_value, comment, change,
interval_list, cs, uint_geom_type))
DBUG_RETURN(1);
lex->alter_info.create_list.push_back(new_field);
lex->last_field=new_field;
DBUG_RETURN(0);
}
/* Store position for column in ALTER TABLE .. ADD column */
void store_position_for_column(const char *name)
{
current_thd->lex->last_field->after=my_const_cast(char*) (name);
}
bool
add_proc_to_list(THD* thd, Item *item)
{
ORDER *order;
Item **item_ptr;
if (!(order = (ORDER *) thd->alloc(sizeof(ORDER)+sizeof(Item*))))
return 1;
item_ptr = (Item**) (order+1);
*item_ptr= item;
order->item=item_ptr;
order->free_me=0;
thd->lex->proc_list.link_in_list((uchar*) order,(uchar**) &order->next);
return 0;
}
/****************************************************************************
** save order by and tables in own lists
****************************************************************************/
bool add_to_list(THD *thd, SQL_LIST &list,Item *item,bool asc)
{
ORDER *order;
DBUG_ENTER("add_to_list");
if (!(order = (ORDER *) thd->alloc(sizeof(ORDER))))
DBUG_RETURN(1);
order->item_ptr= item;
order->item= &order->item_ptr;
order->asc = asc;
order->free_me=0;
order->used=0;
order->counter_used= 0;
list.link_in_list((uchar*) order,(uchar**) &order->next);
DBUG_RETURN(0);
}
/*
Add a table to list of used tables
SYNOPSIS
add_table_to_list()
table Table to add
alias alias for table (or null if no alias)
table_options A set of the following bits:
TL_OPTION_UPDATING Table will be updated
TL_OPTION_FORCE_INDEX Force usage of index
TL_OPTION_ALIAS an alias in multi table DELETE
lock_type How table should be locked
use_index List of indexed used in USE INDEX
ignore_index List of indexed used in IGNORE INDEX
RETURN
0 Error
# Pointer to TABLE_LIST element added to the total table list
*/
TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
Table_ident *table,
LEX_STRING *alias,
ulong table_options,
thr_lock_type lock_type,
List<index_hint> *index_hints_arg,
LEX_STRING *option)
{
register TABLE_LIST *ptr;
TABLE_LIST *previous_table_ref; /* The table preceding the current one. */
char *alias_str;
LEX *lex= thd->lex;
DBUG_ENTER("add_table_to_list");
LINT_INIT(previous_table_ref);
if (!table)
DBUG_RETURN(0); // End of memory
alias_str= alias ? alias->str : table->table.str;
if (!test(table_options & TL_OPTION_ALIAS) &&
check_table_name(table->table.str, table->table.length))
{
my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str);
DBUG_RETURN(0);
}
if (table->is_derived_table() == FALSE && table->db.str &&
check_db_name(&table->db))
{
my_error(ER_WRONG_DB_NAME, MYF(0), table->db.str);
DBUG_RETURN(0);
}
if (!alias) /* Alias is case sensitive */
{
if (table->sel)
{
my_message(ER_DERIVED_MUST_HAVE_ALIAS,
ER(ER_DERIVED_MUST_HAVE_ALIAS), MYF(0));
DBUG_RETURN(0);
}
if (!(alias_str= (char*) thd->memdup(alias_str,table->table.length+1)))
DBUG_RETURN(0);
}
if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
DBUG_RETURN(0); /* purecov: inspected */
if (table->db.str)
{
ptr->db= table->db.str;
ptr->db_length= table->db.length;
}
else if (thd->copy_db_to(&ptr->db, &ptr->db_length))
DBUG_RETURN(0);
ptr->alias= alias_str;
if (lower_case_table_names && table->table.length)
table->table.length= my_casedn_str(files_charset_info, table->table.str);
ptr->table_name=table->table.str;
ptr->table_name_length=table->table.length;
ptr->lock_type= lock_type;
ptr->updating= test(table_options & TL_OPTION_UPDATING);
ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
ptr->derived= table->sel;
if (!ptr->derived && !my_strcasecmp(system_charset_info, ptr->db,
INFORMATION_SCHEMA_NAME.str))
{
ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, ptr->table_name);
if (!schema_table ||
(schema_table->hidden &&
(sql_command_flags[lex->sql_command] & CF_STATUS_COMMAND) == 0))
{
my_error(ER_UNKNOWN_TABLE, MYF(0),
ptr->table_name, INFORMATION_SCHEMA_NAME.str);
DBUG_RETURN(0);
}
ptr->schema_table_name= ptr->table_name;
ptr->schema_table= schema_table;
}
ptr->select_lex= lex->current_select;
ptr->cacheable_table= 1;
ptr->index_hints= index_hints_arg;
ptr->option= option ? option->str : 0;
/* check that used name is unique */
if (lock_type != TL_IGNORE)
{
TABLE_LIST *first_table= (TABLE_LIST*) table_list.first;
if (lex->sql_command == SQLCOM_CREATE_VIEW)
first_table= first_table ? first_table->next_local : NULL;
for (TABLE_LIST *tables= first_table ;
tables ;
tables=tables->next_local)
{
if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
!strcmp(ptr->db, tables->db))
{
my_error(ER_NONUNIQ_TABLE, MYF(0), alias_str); /* purecov: tested */
DBUG_RETURN(0); /* purecov: tested */
}
}
}
/* Store the table reference preceding the current one. */
if (table_list.elements > 0)
{
/*
table_list.next points to the last inserted TABLE_LIST->next_local'
element
We don't use the offsetof() macro here to avoid warnings from gcc
*/
previous_table_ref= (TABLE_LIST*) ((char*) table_list.next -
((char*) &(ptr->next_local) -
(char*) ptr));
/*
Set next_name_resolution_table of the previous table reference to point
to the current table reference. In effect the list
TABLE_LIST::next_name_resolution_table coincides with
TABLE_LIST::next_local. Later this may be changed in
store_top_level_join_columns() for NATURAL/USING joins.
*/
previous_table_ref->next_name_resolution_table= ptr;
}
/*
Link the current table reference in a local list (list for current select).
Notice that as a side effect here we set the next_local field of the
previous table reference to 'ptr'. Here we also add one element to the
list 'table_list'.
*/
table_list.link_in_list((uchar*) ptr, (uchar**) &ptr->next_local);
ptr->next_name_resolution_table= NULL;
/* Link table in global list (all used tables) */
lex->add_to_query_tables(ptr);
DBUG_RETURN(ptr);
}
/*
Initialize a new table list for a nested join
SYNOPSIS
init_nested_join()
thd current thread
DESCRIPTION
The function initializes a structure of the TABLE_LIST type
for a nested join. It sets up its nested join list as empty.
The created structure is added to the front of the current
join list in the st_select_lex object. Then the function
changes the current nest level for joins to refer to the newly
created empty list after having saved the info on the old level
in the initialized structure.
RETURN VALUE
0, if success
1, otherwise
*/
bool st_select_lex::init_nested_join(THD *thd)
{
TABLE_LIST *ptr;
NESTED_JOIN *nested_join;
DBUG_ENTER("init_nested_join");
if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
sizeof(NESTED_JOIN))))
DBUG_RETURN(1);
nested_join= ptr->nested_join=
((NESTED_JOIN*) ((uchar*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));
join_list->push_front(ptr);
ptr->embedding= embedding;
ptr->join_list= join_list;
ptr->alias= (char*) "(nested_join)";
embedding= ptr;
join_list= &nested_join->join_list;
join_list->empty();
DBUG_RETURN(0);
}
/*
End a nested join table list
SYNOPSIS
end_nested_join()
thd current thread
DESCRIPTION
The function returns to the previous join nest level.
If the current level contains only one member, the function
moves it one level up, eliminating the nest.
RETURN VALUE
Pointer to TABLE_LIST element added to the total table list, if success
0, otherwise
*/
TABLE_LIST *st_select_lex::end_nested_join(THD *thd)
{
TABLE_LIST *ptr;
NESTED_JOIN *nested_join;
DBUG_ENTER("end_nested_join");
DBUG_ASSERT(embedding);
ptr= embedding;
join_list= ptr->join_list;
embedding= ptr->embedding;
nested_join= ptr->nested_join;
if (nested_join->join_list.elements == 1)
{
TABLE_LIST *embedded= nested_join->join_list.head();
join_list->pop();
embedded->join_list= join_list;
embedded->embedding= embedding;
join_list->push_front(embedded);
ptr= embedded;
}
else if (nested_join->join_list.elements == 0)
{
join_list->pop();
ptr= 0; // return value
}
DBUG_RETURN(ptr);
}
/*
Nest last join operation
SYNOPSIS
nest_last_join()
thd current thread
DESCRIPTION
The function nest last join operation as if it was enclosed in braces.
RETURN VALUE
0 Error
# Pointer to TABLE_LIST element created for the new nested join
*/
TABLE_LIST *st_select_lex::nest_last_join(THD *thd)
{
TABLE_LIST *ptr;
NESTED_JOIN *nested_join;
List<TABLE_LIST> *embedded_list;
DBUG_ENTER("nest_last_join");
if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
sizeof(NESTED_JOIN))))
DBUG_RETURN(0);
nested_join= ptr->nested_join=
((NESTED_JOIN*) ((uchar*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));
ptr->embedding= embedding;
ptr->join_list= join_list;
ptr->alias= (char*) "(nest_last_join)";
embedded_list= &nested_join->join_list;
embedded_list->empty();
for (uint i=0; i < 2; i++)
{
TABLE_LIST *table= join_list->pop();
table->join_list= embedded_list;
table->embedding= ptr;
embedded_list->push_back(table);
if (table->natural_join)
{
ptr->is_natural_join= TRUE;
/*
If this is a JOIN ... USING, move the list of joined fields to the
table reference that describes the join.
*/
if (prev_join_using)
ptr->join_using_fields= prev_join_using;
}
}
join_list->push_front(ptr);
nested_join->used_tables= nested_join->not_null_tables= (table_map) 0;
DBUG_RETURN(ptr);
}
/*
Add a table to the current join list
SYNOPSIS
add_joined_table()
table the table to add
DESCRIPTION
The function puts a table in front of the current join list
of st_select_lex object.
Thus, joined tables are put into this list in the reverse order
(the most outer join operation follows first).
RETURN VALUE
None
*/
void st_select_lex::add_joined_table(TABLE_LIST *table)
{
DBUG_ENTER("add_joined_table");
join_list->push_front(table);
table->join_list= join_list;
table->embedding= embedding;
DBUG_VOID_RETURN;
}
/*
Convert a right join into equivalent left join
SYNOPSIS
convert_right_join()
thd current thread
DESCRIPTION
The function takes the current join list t[0],t[1] ... and
effectively converts it into the list t[1],t[0] ...
Although the outer_join flag for the new nested table contains
JOIN_TYPE_RIGHT, it will be handled as the inner table of a left join
operation.
EXAMPLES
SELECT * FROM t1 RIGHT JOIN t2 ON on_expr =>
SELECT * FROM t2 LEFT JOIN t1 ON on_expr
SELECT * FROM t1,t2 RIGHT JOIN t3 ON on_expr =>
SELECT * FROM t1,t3 LEFT JOIN t2 ON on_expr
SELECT * FROM t1,t2 RIGHT JOIN (t3,t4) ON on_expr =>
SELECT * FROM t1,(t3,t4) LEFT JOIN t2 ON on_expr
SELECT * FROM t1 LEFT JOIN t2 ON on_expr1 RIGHT JOIN t3 ON on_expr2 =>
SELECT * FROM t3 LEFT JOIN (t1 LEFT JOIN t2 ON on_expr2) ON on_expr1
RETURN
Pointer to the table representing the inner table, if success
0, otherwise
*/
TABLE_LIST *st_select_lex::convert_right_join()
{
TABLE_LIST *tab2= join_list->pop();
TABLE_LIST *tab1= join_list->pop();
DBUG_ENTER("convert_right_join");
join_list->push_front(tab2);
join_list->push_front(tab1);
tab1->outer_join|= JOIN_TYPE_RIGHT;
DBUG_RETURN(tab1);
}
/*
Set lock for all tables in current select level
SYNOPSIS:
set_lock_for_tables()
lock_type Lock to set for tables
NOTE:
If lock is a write lock, then tables->updating is set 1
This is to get tables_ok to know that the table is updated by the
query
*/
void st_select_lex::set_lock_for_tables(thr_lock_type lock_type)
{
bool for_update= lock_type >= TL_READ_NO_INSERT;
DBUG_ENTER("set_lock_for_tables");
DBUG_PRINT("enter", ("lock_type: %d for_update: %d", lock_type,
for_update));
for (TABLE_LIST *tables= (TABLE_LIST*) table_list.first;
tables;
tables= tables->next_local)
{
tables->lock_type= lock_type;
tables->updating= for_update;
}
DBUG_VOID_RETURN;
}
/*
Create a fake SELECT_LEX for a unit
SYNOPSIS:
add_fake_select_lex()
thd thread handle
DESCRIPTION
The method create a fake SELECT_LEX object for a unit.
This object is created for any union construct containing a union
operation and also for any single select union construct of the form
(SELECT ... ORDER BY order_list [LIMIT n]) ORDER BY ...
or of the form
(SELECT ... ORDER BY LIMIT n) ORDER BY ...
NOTES
The object is used to retrieve rows from the temporary table
where the result on the union is obtained.
RETURN VALUES
1 on failure to create the object
0 on success
*/
bool st_select_lex_unit::add_fake_select_lex(THD *thd_arg)
{
SELECT_LEX *first_sl= first_select();
DBUG_ENTER("add_fake_select_lex");
DBUG_ASSERT(!fake_select_lex);
if (!(fake_select_lex= new (thd_arg->mem_root) SELECT_LEX()))
DBUG_RETURN(1);
fake_select_lex->include_standalone(this,
(SELECT_LEX_NODE**)&fake_select_lex);
fake_select_lex->select_number= INT_MAX;
fake_select_lex->parent_lex= thd_arg->lex; /* Used in init_query. */
fake_select_lex->make_empty_select();
fake_select_lex->linkage= GLOBAL_OPTIONS_TYPE;
fake_select_lex->select_limit= 0;
fake_select_lex->context.outer_context=first_sl->context.outer_context;
/* allow item list resolving in fake select for ORDER BY */
fake_select_lex->context.resolve_in_select_list= TRUE;
fake_select_lex->context.select_lex= fake_select_lex;
if (!is_union())
{
/*
This works only for
(SELECT ... ORDER BY list [LIMIT n]) ORDER BY order_list [LIMIT m],
(SELECT ... LIMIT n) ORDER BY order_list [LIMIT m]
just before the parser starts processing order_list
*/
global_parameters= fake_select_lex;
fake_select_lex->no_table_names_allowed= 1;
thd_arg->lex->current_select= fake_select_lex;
}
thd_arg->lex->pop_context();
DBUG_RETURN(0);
}
/*
Push a new name resolution context for a JOIN ... ON clause to the
context stack of a query block.
SYNOPSIS
push_new_name_resolution_context()
thd pointer to current thread
left_op left operand of the JOIN
right_op rigth operand of the JOIN
DESCRIPTION
Create a new name resolution context for a JOIN ... ON clause,
set the first and last leaves of the list of table references
to be used for name resolution, and push the newly created
context to the stack of contexts of the query.
RETURN
FALSE if all is OK
TRUE if a memory allocation error occured
*/
bool
push_new_name_resolution_context(THD *thd,
TABLE_LIST *left_op, TABLE_LIST *right_op)
{
Name_resolution_context *on_context;
if (!(on_context= new (thd->mem_root) Name_resolution_context))
return TRUE;
on_context->init();
on_context->first_name_resolution_table=
left_op->first_leaf_for_name_resolution();
on_context->last_name_resolution_table=
right_op->last_leaf_for_name_resolution();
return thd->lex->push_context(on_context);
}
/*
Add an ON condition to the second operand of a JOIN ... ON.
SYNOPSIS
add_join_on
b the second operand of a JOIN ... ON
expr the condition to be added to the ON clause
DESCRIPTION
Add an ON condition to the right operand of a JOIN ... ON clause.
RETURN
FALSE if there was some error
TRUE if all is OK
*/
void add_join_on(TABLE_LIST *b, Item *expr)
{
if (expr)
{
if (!b->on_expr)
b->on_expr= expr;
else
{
/*
If called from the parser, this happens if you have both a
right and left join. If called later, it happens if we add more
than one condition to the ON clause.
*/
b->on_expr= new Item_cond_and(b->on_expr,expr);
}
b->on_expr->top_level_item();
}
}
/*
Mark that there is a NATURAL JOIN or JOIN ... USING between two
tables.
SYNOPSIS
add_join_natural()
a Left join argument
b Right join argument
using_fields Field names from USING clause
lex The current st_select_lex
IMPLEMENTATION
This function marks that table b should be joined with a either via
a NATURAL JOIN or via JOIN ... USING. Both join types are special
cases of each other, so we treat them together. The function
setup_conds() creates a list of equal condition between all fields
of the same name for NATURAL JOIN or the fields in 'using_fields'
for JOIN ... USING. The list of equality conditions is stored
either in b->on_expr, or in JOIN::conds, depending on whether there
was an outer join.
EXAMPLE
SELECT * FROM t1 NATURAL LEFT JOIN t2
<=>
SELECT * FROM t1 LEFT JOIN t2 ON (t1.i=t2.i and t1.j=t2.j ... )
SELECT * FROM t1 NATURAL JOIN t2 WHERE <some_cond>
<=>
SELECT * FROM t1, t2 WHERE (t1.i=t2.i and t1.j=t2.j and <some_cond>)
SELECT * FROM t1 JOIN t2 USING(j) WHERE <some_cond>
<=>
SELECT * FROM t1, t2 WHERE (t1.j=t2.j and <some_cond>)
RETURN
None
*/
void add_join_natural(TABLE_LIST *a, TABLE_LIST *b, List<String> *using_fields,
SELECT_LEX *lex)
{
b->natural_join= a;
lex->prev_join_using= using_fields;
}
/*
Reload/resets privileges and the different caches.
SYNOPSIS
reload_acl_and_cache()
thd Thread handler (can be NULL!)
options What should be reset/reloaded (tables, privileges,
slave...)
tables Tables to flush (if any)
write_to_binlog Depending on 'options', it may be very bad to write the
query to the binlog (e.g. FLUSH SLAVE); this is a
pointer where reload_acl_and_cache() will put 0 if
it thinks we really should not write to the binlog.
Otherwise it will put 1.
RETURN
0 ok
!=0 error. thd->killed or thd->net.report_error is set
*/
bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
bool *write_to_binlog)
{
bool result=0;
select_errors=0; /* Write if more errors */
bool tmp_write_to_binlog= 1;
DBUG_ASSERT(!thd || !thd->in_sub_stmt);
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (options & REFRESH_GRANT)
{
THD *tmp_thd= 0;
/*
If reload_acl_and_cache() is called from SIGHUP handler we have to
allocate temporary THD for execution of acl_reload()/grant_reload().
*/
if (!thd && (thd= (tmp_thd= new THD)))
{
thd->thread_stack= (char*) &tmp_thd;
thd->store_globals();
}
if (thd)
{
(void)acl_reload(thd);
(void)grant_reload(thd);
}
if (tmp_thd)
{
delete tmp_thd;
/* Remember that we don't have a THD */
my_pthread_setspecific_ptr(THR_THD, 0);
thd= 0;
}
reset_mqh((LEX_USER *)NULL, TRUE);
}
#endif
if (options & REFRESH_LOG)
{
/*
Flush the normal query log, the update log, the binary log,
the slow query log, the relay log (if it exists) and the log
tables.
*/
/*
Writing this command to the binlog may result in infinite loops
when doing mysqlbinlog|mysql, and anyway it does not really make
sense to log it automatically (would cause more trouble to users
than it would help them)
*/
tmp_write_to_binlog= 0;
if( mysql_bin_log.is_open() )
{
mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
}
#ifdef HAVE_REPLICATION
pthread_mutex_lock(&LOCK_active_mi);
rotate_relay_log(active_mi);
pthread_mutex_unlock(&LOCK_active_mi);
#endif
/* flush slow and general logs */
logger.flush_logs(thd);
if (ha_flush_logs(NULL))
result=1;
if (flush_error_log())
result=1;
}
#ifdef HAVE_QUERY_CACHE
if (options & REFRESH_QUERY_CACHE_FREE)
{
query_cache.pack(); // FLUSH QUERY CACHE
options &= ~REFRESH_QUERY_CACHE; // Don't flush cache, just free memory
}
if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
{
query_cache.flush(); // RESET QUERY CACHE
}
#endif /*HAVE_QUERY_CACHE*/
/*
Note that if REFRESH_READ_LOCK bit is set then REFRESH_TABLES is set too
(see sql_yacc.yy)
*/
if (options & (REFRESH_TABLES | REFRESH_READ_LOCK))
{
if ((options & REFRESH_READ_LOCK) && thd)
{
/*
We must not try to aspire a global read lock if we have a write
locked table. This would lead to a deadlock when trying to
reopen (and re-lock) the table after the flush.
*/
if (thd->locked_tables)
{
THR_LOCK_DATA **lock_p= thd->locked_tables->locks;
THR_LOCK_DATA **end_p= lock_p + thd->locked_tables->lock_count;
for (; lock_p < end_p; lock_p++)
{
if ((*lock_p)->type == TL_WRITE)
{
my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
return 1;
}
}
}
/*
Writing to the binlog could cause deadlocks, as we don't log
UNLOCK TABLES
*/
tmp_write_to_binlog= 0;
if (lock_global_read_lock(thd))
return 1; // Killed
result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1,
tables);
if (make_global_read_lock_block_commit(thd)) // Killed
{
/* Don't leave things in a half-locked state */
unlock_global_read_lock(thd);
return 1;
}
}
else
result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
my_dbopt_cleanup();
}
if (options & REFRESH_HOSTS)
hostname_cache_refresh();
if (thd && (options & REFRESH_STATUS))
refresh_status(thd);
if (options & REFRESH_THREADS)
flush_thread_cache();
#ifdef HAVE_REPLICATION
if (options & REFRESH_MASTER)
{
DBUG_ASSERT(thd);
tmp_write_to_binlog= 0;
if (reset_master(thd))
{
result=1;
thd->fatal_error(); // Ensure client get error
}
}
#endif
#ifdef OPENSSL
if (options & REFRESH_DES_KEY_FILE)
{
if (des_key_file)
result=load_des_key_file(des_key_file);
}
#endif
#ifdef HAVE_REPLICATION
if (options & REFRESH_SLAVE)
{
tmp_write_to_binlog= 0;
pthread_mutex_lock(&LOCK_active_mi);
if (reset_slave(thd, active_mi))
result=1;
pthread_mutex_unlock(&LOCK_active_mi);
}
#endif
if (options & REFRESH_USER_RESOURCES)
reset_mqh((LEX_USER *) NULL, 0); /* purecov: inspected */
*write_to_binlog= tmp_write_to_binlog;
return result;
}
/*
kills a thread
SYNOPSIS
kill_one_thread()
thd Thread class
id Thread id
only_kill_query Should it kill the query or the connection
NOTES
This is written such that we have a short lock on LOCK_thread_count
*/
uint kill_one_thread(THD *thd, ulong id, bool only_kill_query)
{
THD *tmp;
uint error=ER_NO_SUCH_THREAD;
DBUG_ENTER("kill_one_thread");
DBUG_PRINT("enter", ("id=%lu only_kill=%d", id, only_kill_query));
VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
I_List_iterator<THD> it(threads);
while ((tmp=it++))
{
if (tmp->command == COM_DAEMON)
continue;
if (tmp->thread_id == id)
{
pthread_mutex_lock(&tmp->LOCK_delete); // Lock from delete
break;
}
}
VOID(pthread_mutex_unlock(&LOCK_thread_count));
if (tmp)
{
if ((thd->security_ctx->master_access & SUPER_ACL) ||
!strcmp(thd->security_ctx->user, tmp->security_ctx->user))
{
tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
error=0;
}
else
error=ER_KILL_DENIED_ERROR;
pthread_mutex_unlock(&tmp->LOCK_delete);
}
DBUG_PRINT("exit", ("%d", error));
DBUG_RETURN(error);
}
/*
kills a thread and sends response
SYNOPSIS
sql_kill()
thd Thread class
id Thread id
only_kill_query Should it kill the query or the connection
*/
void sql_kill(THD *thd, ulong id, bool only_kill_query)
{
uint error;
if (!(error= kill_one_thread(thd, id, only_kill_query)))
send_ok(thd);
else
my_error(error, MYF(0), id);
}
/* If pointer is not a null pointer, append filename to it */
bool append_file_to_dir(THD *thd, const char **filename_ptr,
const char *table_name)
{
char buff[FN_REFLEN],*ptr, *end;
if (!*filename_ptr)
return 0; // nothing to do
/* Check that the filename is not too long and it's a hard path */
if (strlen(*filename_ptr)+strlen(table_name) >= FN_REFLEN-1 ||
!test_if_hard_path(*filename_ptr))
{
my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
return 1;
}
/* Fix is using unix filename format on dos */
strmov(buff,*filename_ptr);
end=convert_dirname(buff, *filename_ptr, NullS);
if (!(ptr= (char*) thd->alloc((size_t) (end-buff) + strlen(table_name)+1)))
return 1; // End of memory
*filename_ptr=ptr;
strxmov(ptr,buff,table_name,NullS);
return 0;
}
/*
Check if the select is a simple select (not an union)
SYNOPSIS
check_simple_select()
RETURN VALUES
0 ok
1 error ; In this case the error messege is sent to the client
*/
bool check_simple_select()
{
THD *thd= current_thd;
LEX *lex= thd->lex;
if (lex->current_select != &lex->select_lex)
{
char command[80];
Lex_input_stream *lip= thd->m_lip;
strmake(command, lip->yylval->symbol.str,
min(lip->yylval->symbol.length, sizeof(command)-1));
my_error(ER_CANT_USE_OPTION_HERE, MYF(0), command);
return 1;
}
return 0;
}
Comp_creator *comp_eq_creator(bool invert)
{
return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
}
Comp_creator *comp_ge_creator(bool invert)
{
return invert?(Comp_creator *)&lt_creator:(Comp_creator *)&ge_creator;
}
Comp_creator *comp_gt_creator(bool invert)
{
return invert?(Comp_creator *)&le_creator:(Comp_creator *)&gt_creator;
}
Comp_creator *comp_le_creator(bool invert)
{
return invert?(Comp_creator *)&gt_creator:(Comp_creator *)&le_creator;
}
Comp_creator *comp_lt_creator(bool invert)
{
return invert?(Comp_creator *)&ge_creator:(Comp_creator *)&lt_creator;
}
Comp_creator *comp_ne_creator(bool invert)
{
return invert?(Comp_creator *)&eq_creator:(Comp_creator *)&ne_creator;
}
/*
Construct ALL/ANY/SOME subquery Item
SYNOPSIS
all_any_subquery_creator()
left_expr - pointer to left expression
cmp - compare function creator
all - true if we create ALL subquery
select_lex - pointer on parsed subquery structure
RETURN VALUE
constructed Item (or 0 if out of memory)
*/
Item * all_any_subquery_creator(Item *left_expr,
chooser_compare_func_creator cmp,
bool all,
SELECT_LEX *select_lex)
{
if ((cmp == &comp_eq_creator) && !all) // = ANY <=> IN
return new Item_in_subselect(left_expr, select_lex);
if ((cmp == &comp_ne_creator) && all) // <> ALL <=> NOT IN
return new Item_func_not(new Item_in_subselect(left_expr, select_lex));
Item_allany_subselect *it=
new Item_allany_subselect(left_expr, cmp, select_lex, all);
if (all)
return it->upper_item= new Item_func_not_all(it); /* ALL */
return it->upper_item= new Item_func_nop_all(it); /* ANY/SOME */
}
/*
Multi update query pre-check
SYNOPSIS
multi_update_precheck()
thd Thread handler
tables Global/local table list (have to be the same)
RETURN VALUE
FALSE OK
TRUE Error
*/
bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
{
const char *msg= 0;
TABLE_LIST *table;
LEX *lex= thd->lex;
SELECT_LEX *select_lex= &lex->select_lex;
DBUG_ENTER("multi_update_precheck");
if (select_lex->item_list.elements != lex->value_list.elements)
{
my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
DBUG_RETURN(TRUE);
}
/*
Ensure that we have UPDATE or SELECT privilege for each table
The exact privilege is checked in mysql_multi_update()
*/
for (table= tables; table; table= table->next_local)
{
if (table->derived)
table->grant.privilege= SELECT_ACL;
else if ((check_access(thd, UPDATE_ACL, table->db,
&table->grant.privilege, 0, 1,
test(table->schema_table)) ||
check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) &&
(check_access(thd, SELECT_ACL, table->db,
&table->grant.privilege, 0, 0,
test(table->schema_table)) ||
check_grant(thd, SELECT_ACL, table, 0, 1, 0)))
DBUG_RETURN(TRUE);
table->table_in_first_from_clause= 1;
}
/*
Is there tables of subqueries?
*/
if (&lex->select_lex != lex->all_selects_list)
{
DBUG_PRINT("info",("Checking sub query list"));
for (table= tables; table; table= table->next_global)
{
if (!table->table_in_first_from_clause)
{
if (check_access(thd, SELECT_ACL, table->db,
&table->grant.privilege, 0, 0,
test(table->schema_table)) ||
check_grant(thd, SELECT_ACL, table, 0, 1, 0))
DBUG_RETURN(TRUE);
}
}
}
if (select_lex->order_list.elements)
msg= "ORDER BY";
else if (select_lex->select_limit)
msg= "LIMIT";
if (msg)
{
my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
DBUG_RETURN(TRUE);
}
DBUG_RETURN(FALSE);
}
/*
Multi delete query pre-check
SYNOPSIS
multi_delete_precheck()
thd Thread handler
tables Global/local table list
RETURN VALUE
FALSE OK
TRUE error
*/
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables)
{
SELECT_LEX *select_lex= &thd->lex->select_lex;
TABLE_LIST *aux_tables=
(TABLE_LIST *)thd->lex->auxiliary_table_list.first;
TABLE_LIST **save_query_tables_own_last= thd->lex->query_tables_own_last;
DBUG_ENTER("multi_delete_precheck");
/* sql_yacc guarantees that tables and aux_tables are not zero */
DBUG_ASSERT(aux_tables != 0);
if (check_table_access(thd, SELECT_ACL, tables, 0))
DBUG_RETURN(TRUE);
/*
Since aux_tables list is not part of LEX::query_tables list we
have to juggle with LEX::query_tables_own_last value to be able
call check_table_access() safely.
*/
thd->lex->query_tables_own_last= 0;
if (check_table_access(thd, DELETE_ACL, aux_tables, 0))
{
thd->lex->query_tables_own_last= save_query_tables_own_last;
DBUG_RETURN(TRUE);
}
thd->lex->query_tables_own_last= save_query_tables_own_last;
if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
{
my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
DBUG_RETURN(TRUE);
}
DBUG_RETURN(FALSE);
}
/*
Link tables in auxilary table list of multi-delete with corresponding
elements in main table list, and set proper locks for them.
SYNOPSIS
multi_delete_set_locks_and_link_aux_tables()
lex - pointer to LEX representing multi-delete
RETURN VALUE
FALSE - success
TRUE - error
*/
bool multi_delete_set_locks_and_link_aux_tables(LEX *lex)
{
TABLE_LIST *tables= (TABLE_LIST*)lex->select_lex.table_list.first;
TABLE_LIST *target_tbl;
DBUG_ENTER("multi_delete_set_locks_and_link_aux_tables");
lex->table_count= 0;
for (target_tbl= (TABLE_LIST *)lex->auxiliary_table_list.first;
target_tbl; target_tbl= target_tbl->next_local)
{
lex->table_count++;
/* All tables in aux_tables must be found in FROM PART */
TABLE_LIST *walk;
for (walk= tables; walk; walk= walk->next_local)
{
if (!my_strcasecmp(table_alias_charset,
target_tbl->alias, walk->alias) &&
!strcmp(walk->db, target_tbl->db))
break;
}
if (!walk)
{
my_error(ER_UNKNOWN_TABLE, MYF(0),
target_tbl->table_name, "MULTI DELETE");
DBUG_RETURN(TRUE);
}
if (!walk->derived)
{
target_tbl->table_name= walk->table_name;
target_tbl->table_name_length= walk->table_name_length;
}
walk->updating= target_tbl->updating;
walk->lock_type= target_tbl->lock_type;
target_tbl->correspondent_table= walk; // Remember corresponding table
}
DBUG_RETURN(FALSE);
}
/*
simple UPDATE query pre-check
SYNOPSIS
update_precheck()
thd Thread handler
tables Global table list
RETURN VALUE
FALSE OK
TRUE Error
*/
bool update_precheck(THD *thd, TABLE_LIST *tables)
{
DBUG_ENTER("update_precheck");
if (thd->lex->select_lex.item_list.elements != thd->lex->value_list.elements)
{
my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
DBUG_RETURN(TRUE);
}
DBUG_RETURN(check_one_table_access(thd, UPDATE_ACL, tables));
}
/*
simple DELETE query pre-check
SYNOPSIS
delete_precheck()
thd Thread handler
tables Global table list
RETURN VALUE
FALSE OK
TRUE error
*/
bool delete_precheck(THD *thd, TABLE_LIST *tables)
{
DBUG_ENTER("delete_precheck");
if (check_one_table_access(thd, DELETE_ACL, tables))
DBUG_RETURN(TRUE);
/* Set privilege for the WHERE clause */
tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
DBUG_RETURN(FALSE);
}
/*
simple INSERT query pre-check
SYNOPSIS
insert_precheck()
thd Thread handler
tables Global table list
RETURN VALUE
FALSE OK
TRUE error
*/
bool insert_precheck(THD *thd, TABLE_LIST *tables)
{
LEX *lex= thd->lex;
DBUG_ENTER("insert_precheck");
/*
Check that we have modify privileges for the first table and
select privileges for the rest
*/
ulong privilege= (INSERT_ACL |
(lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) |
(lex->value_list.elements ? UPDATE_ACL : 0));
if (check_one_table_access(thd, privilege, tables))
DBUG_RETURN(TRUE);
if (lex->update_list.elements != lex->value_list.elements)
{
my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
DBUG_RETURN(TRUE);
}
DBUG_RETURN(FALSE);
}
/**
@brief Check privileges for SHOW CREATE TABLE statement.
@param thd Thread context
@param table Target table
@retval TRUE Failure
@retval FALSE Success
*/
static bool check_show_create_table_access(THD *thd, TABLE_LIST *table)
{
return check_access(thd, SELECT_ACL | EXTRA_ACL, table->db,
&table->grant.privilege, 0, 0,
test(table->schema_table)) ||
check_grant(thd, SELECT_ACL, table, 2, UINT_MAX, 0);
}
/*
CREATE TABLE query pre-check
SYNOPSIS
create_table_precheck()
thd Thread handler
tables Global table list
create_table Table which will be created
RETURN VALUE
FALSE OK
TRUE Error
*/
bool create_table_precheck(THD *thd, TABLE_LIST *tables,
TABLE_LIST *create_table)
{
LEX *lex= thd->lex;
SELECT_LEX *select_lex= &lex->select_lex;
ulong want_priv;
bool error= TRUE; // Error message is given
DBUG_ENTER("create_table_precheck");
want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
CREATE_TMP_ACL : CREATE_ACL);
if (check_access(thd, want_priv, create_table->db,
&create_table->grant.privilege, 0, 0,
test(create_table->schema_table)) ||
check_merge_table_access(thd, create_table->db,
(TABLE_LIST *)
lex->create_info.merge_list.first))
goto err;
if (want_priv != CREATE_TMP_ACL &&
check_grant(thd, want_priv, create_table, 0, 1, 0))
goto err;
if (select_lex->item_list.elements)
{
/* Check permissions for used tables in CREATE TABLE ... SELECT */
#ifdef NOT_NECESSARY_TO_CHECK_CREATE_TABLE_EXIST_WHEN_PREPARING_STATEMENT
/* This code throws an ill error for CREATE TABLE t1 SELECT * FROM t1 */
/*
Only do the check for PS, because we on execute we have to check that
against the opened tables to ensure we don't use a table that is part
of the view (which can only be done after the table has been opened).
*/
if (thd->stmt_arena->is_stmt_prepare_or_first_sp_execute())
{
/*
For temporary tables we don't have to check if the created table exists
*/
if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
find_table_in_global_list(tables, create_table->db,
create_table->table_name))
{
error= FALSE;
goto err;
}
}
#endif
if (tables && check_table_access(thd, SELECT_ACL, tables,0))
goto err;
}
else if (lex->create_info.options & HA_LEX_CREATE_TABLE_LIKE)
{
if (check_show_create_table_access(thd, tables))
goto err;
}
error= FALSE;
err:
DBUG_RETURN(error);
}
/*
negate given expression
SYNOPSIS
negate_expression()
thd thread handler
expr expression for negation
RETURN
negated expression
*/
Item *negate_expression(THD *thd, Item *expr)
{
Item *negated;
if (expr->type() == Item::FUNC_ITEM &&
((Item_func *) expr)->functype() == Item_func::NOT_FUNC)
{
/* it is NOT(NOT( ... )) */
Item *arg= ((Item_func *) expr)->arguments()[0];
enum_parsing_place place= thd->lex->current_select->parsing_place;
if (arg->is_bool_func() || place == IN_WHERE || place == IN_HAVING)
return arg;
/*
if it is not boolean function then we have to emulate value of
not(not(a)), it will be a != 0
*/
return new Item_func_ne(arg, new Item_int((char*) "0", 0, 1));
}
if ((negated= expr->neg_transformer(thd)) != 0)
return negated;
return new Item_func_not(expr);
}
/*
Set the specified definer to the default value, which is the current user in
the thread.
SYNOPSIS
get_default_definer()
thd [in] thread handler
definer [out] definer
*/
void get_default_definer(THD *thd, LEX_USER *definer)
{
const Security_context *sctx= thd->security_ctx;
definer->user.str= (char *) sctx->priv_user;
definer->user.length= strlen(definer->user.str);
definer->host.str= (char *) sctx->priv_host;
definer->host.length= strlen(definer->host.str);
}
/*
Create default definer for the specified THD.
SYNOPSIS
create_default_definer()
thd [in] thread handler
RETURN
On success, return a valid pointer to the created and initialized
LEX_USER, which contains definer information.
On error, return 0.
*/
LEX_USER *create_default_definer(THD *thd)
{
LEX_USER *definer;
if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER))))
return 0;
get_default_definer(thd, definer);
return definer;
}
/*
Create definer with the given user and host names.
SYNOPSIS
create_definer()
thd [in] thread handler
user_name [in] user name
host_name [in] host name
RETURN
On success, return a valid pointer to the created and initialized
LEX_USER, which contains definer information.
On error, return 0.
*/
LEX_USER *create_definer(THD *thd, LEX_STRING *user_name, LEX_STRING *host_name)
{
LEX_USER *definer;
/* Create and initialize. */
if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER))))
return 0;
definer->user= *user_name;
definer->host= *host_name;
return definer;
}
/*
Retuns information about user or current user.
SYNOPSIS
get_current_user()
thd [in] thread handler
user [in] user
RETURN
On success, return a valid pointer to initialized
LEX_USER, which contains user information.
On error, return 0.
*/
LEX_USER *get_current_user(THD *thd, LEX_USER *user)
{
if (!user->user.str) // current_user
return create_default_definer(thd);
return user;
}
/*
Check that byte length of a string does not exceed some limit.
SYNOPSIS
check_string_byte_length()
str string to be checked
err_msg error message to be displayed if the string is too long
max_byte_length max length in bytes
RETURN
FALSE the passed string is not longer than max_length
TRUE the passed string is longer than max_length
NOTE
The function is not used in existing code but can be useful later?
*/
bool check_string_byte_length(LEX_STRING *str, const char *err_msg,
uint max_byte_length)
{
if (str->length <= max_byte_length)
return FALSE;
my_error(ER_WRONG_STRING_LENGTH, MYF(0), str->str, err_msg, max_byte_length);
return TRUE;
}
/*
Check that char length of a string does not exceed some limit.
SYNOPSIS
check_string_char_length()
str string to be checked
err_msg error message to be displayed if the string is too long
max_char_length max length in symbols
cs string charset
RETURN
FALSE the passed string is not longer than max_char_length
TRUE the passed string is longer than max_char_length
*/
bool check_string_char_length(LEX_STRING *str, const char *err_msg,
uint max_char_length, CHARSET_INFO *cs,
bool no_error)
{
int well_formed_error;
uint res= cs->cset->well_formed_len(cs, str->str, str->str + str->length,
max_char_length, &well_formed_error);
if (!well_formed_error && str->length == res)
return FALSE;
if (!no_error)
my_error(ER_WRONG_STRING_LENGTH, MYF(0), str->str, err_msg, max_char_length);
return TRUE;
}
View Git Blame Copy Permalink