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8af8c530404c63ea9ded5fe5e89b1255cee5c91c
mariadb/sql/sql_class.h
unknown daddf263e5 fixed mechanism of detection selection from table wich we update 
(BUG##9398, BUG#8703)
fixed wrong join view detection in multi-delete which lead to server crash


mysql-test/r/lowercase_view.result:
  added new tests of updation and selection from the same table
mysql-test/r/view.result:
  added new tests of updation and selection from the same table
  added test of multidelete command over join view which lead to server crash
  test suite from bugs #9398 and #8703
mysql-test/t/lowercase_view.test:
  added new tests of updation and selection from the same table
mysql-test/t/view.test:
  added new tests of updation and selection from the same table
  added test of multidelete command over join view which lead to server crash
  test suite from bugs #9398 and #8703
sql/sql_base.cc:
  changed procedure of finding tables
sql/sql_class.cc:
  added derived table procession detection
sql/sql_class.h:
  added derived table procession detection
sql/sql_delete.cc:
  fixed detection of selection from table which update for multidelete
sql/sql_derived.cc:
  added derived table procession detection
sql/sql_lex.cc:
  added detection os SELECTs processed inside derived tables
  removed old mechanism of multidelete/multiupdate table duplication detection (which can't work with views)
sql/sql_lex.h:
  added detection os SELECTs processed inside derived tables
  removed old mechanism of multidelete/multiupdate table duplication detection (which can't work with views)
sql/sql_parse.cc:
  removed wrong test of join view (for multidelete in can be not only first table)
sql/sql_prepare.cc:
  added detection os SELECTs processed inside derived tables (reset it for reusing in PS/SP)
sql/sql_select.cc:
  added detection os SELECTs processed inside derived tables
sql/sql_update.cc:
  fixed detection of selection from table which update for multiupdate
2005-03-28 15:13:31 +03:00

1944 lines
59 KiB
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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; either version 2 of the License, or
(at your option) any later version.
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 */
/* Classes in mysql */
#ifdef __GNUC__
#pragma interface /* gcc class implementation */
#endif
// TODO: create log.h and move all the log header stuff there
class Query_log_event;
class Load_log_event;
class Slave_log_event;
class Format_description_log_event;
class sp_rcontext;
class sp_cache;
enum enum_enable_or_disable { LEAVE_AS_IS, ENABLE, DISABLE };
enum enum_ha_read_modes { RFIRST, RNEXT, RPREV, RLAST, RKEY, RNEXT_SAME };
enum enum_duplicates { DUP_ERROR, DUP_REPLACE, DUP_UPDATE };
enum enum_log_type { LOG_CLOSED, LOG_TO_BE_OPENED, LOG_NORMAL, LOG_NEW, LOG_BIN};
enum enum_delay_key_write { DELAY_KEY_WRITE_NONE, DELAY_KEY_WRITE_ON,
DELAY_KEY_WRITE_ALL };
enum enum_check_fields { CHECK_FIELD_IGNORE, CHECK_FIELD_WARN,
CHECK_FIELD_ERROR_FOR_NULL };
extern char internal_table_name[2];
extern const char **errmesg;
#define TC_LOG_PAGE_SIZE 8192
#define TC_LOG_MIN_SIZE (3*TC_LOG_PAGE_SIZE)
extern ulong opt_tc_log_size;
extern ulong tc_log_max_pages_used;
extern ulong tc_log_page_size;
extern ulong tc_log_page_waits;
#define TC_HEURISTIC_RECOVER_COMMIT 1
#define TC_HEURISTIC_RECOVER_ROLLBACK 2
extern uint tc_heuristic_recover;
/*
Transaction Coordinator log - a base abstract class
for two different implementations
*/
class TC_LOG
{
public:
int using_heuristic_recover();
TC_LOG() {}
virtual ~TC_LOG() {}
virtual int open(const char *opt_name)=0;
virtual void close()=0;
virtual int log(THD *thd, my_xid xid)=0;
virtual void unlog(ulong cookie, my_xid xid)=0;
};
class TC_LOG_DUMMY: public TC_LOG // use it to disable the logging
{
public:
int open(const char *opt_name) { return 0; }
void close() { }
int log(THD *thd, my_xid xid) { return 1; }
void unlog(ulong cookie, my_xid xid) { }
};
#ifdef HAVE_MMAP
class TC_LOG_MMAP: public TC_LOG
{
public: // only to keep Sun Forte on sol9x86 happy
typedef enum {
POOL, // page is in pool
ERROR, // last sync failed
DIRTY // new xids added since last sync
} PAGE_STATE;
private:
typedef struct st_page {
struct st_page *next; // page a linked in a fifo queue
my_xid *start, *end; // usable area of a page
my_xid *ptr; // next xid will be written here
int size, free; // max and current number of free xid slots on the page
int waiters; // number of waiters on condition
PAGE_STATE state; // see above
pthread_mutex_t lock; // to access page data or control structure
pthread_cond_t cond; // to wait for a sync
} PAGE;
char logname[FN_REFLEN];
File fd;
my_off_t file_length;
uint npages, inited;
uchar *data;
struct st_page *pages, *syncing, *active, *pool, *pool_last;
/*
note that, e.g. LOCK_active is only used to protect
'active' pointer, to protect the content of the active page
one has to use active->lock.
Same for LOCK_pool and LOCK_sync
*/
pthread_mutex_t LOCK_active, LOCK_pool, LOCK_sync;
pthread_cond_t COND_pool, COND_active;
public:
TC_LOG_MMAP(): inited(0) {}
int open(const char *opt_name);
void close();
int log(THD *thd, my_xid xid);
void unlog(ulong cookie, my_xid xid);
int recover();
private:
void get_active_from_pool();
int sync();
int overflow();
};
#else
#define TC_LOG_MMAP TC_LOG_DUMMY
#endif
extern TC_LOG *tc_log;
extern TC_LOG_MMAP tc_log_mmap;
extern TC_LOG_DUMMY tc_log_dummy;
/* log info errors */
#define LOG_INFO_EOF -1
#define LOG_INFO_IO -2
#define LOG_INFO_INVALID -3
#define LOG_INFO_SEEK -4
#define LOG_INFO_MEM -6
#define LOG_INFO_FATAL -7
#define LOG_INFO_IN_USE -8
/* bitmap to SQL_LOG::close() */
#define LOG_CLOSE_INDEX 1
#define LOG_CLOSE_TO_BE_OPENED 2
#define LOG_CLOSE_STOP_EVENT 4
struct st_relay_log_info;
typedef struct st_log_info
{
char log_file_name[FN_REFLEN];
my_off_t index_file_offset, index_file_start_offset;
my_off_t pos;
bool fatal; // if the purge happens to give us a negative offset
pthread_mutex_t lock;
st_log_info():fatal(0) { pthread_mutex_init(&lock, MY_MUTEX_INIT_FAST);}
~st_log_info() { pthread_mutex_destroy(&lock);}
} LOG_INFO;
typedef struct st_user_var_events
{
user_var_entry *user_var_event;
char *value;
ulong length;
Item_result type;
uint charset_number;
} BINLOG_USER_VAR_EVENT;
#define RP_LOCK_LOG_IS_ALREADY_LOCKED 1
#define RP_FORCE_ROTATE 2
class Log_event;
/*
TODO split MYSQL_LOG into base MYSQL_LOG and
MYSQL_QUERY_LOG, MYSQL_SLOW_LOG, MYSQL_BIN_LOG
most of the code from MYSQL_LOG should be in the MYSQL_BIN_LOG
only (TC_LOG included)
TODO use mmap instead of IO_CACHE for binlog
(mmap+fsync is two times faster than write+fsync)
*/
class MYSQL_LOG: public TC_LOG
{
private:
/* LOCK_log and LOCK_index are inited by init_pthread_objects() */
pthread_mutex_t LOCK_log, LOCK_index;
pthread_cond_t update_cond;
ulonglong bytes_written;
time_t last_time,query_start;
IO_CACHE log_file;
IO_CACHE index_file;
char *name;
char time_buff[20],db[NAME_LEN+1];
char log_file_name[FN_REFLEN],index_file_name[FN_REFLEN];
// current file sequence number for load data infile binary logging
uint file_id;
uint open_count; // For replication
volatile enum_log_type log_type;
enum cache_type io_cache_type;
bool write_error, inited;
bool need_start_event;
/*
no_auto_events means we don't want any of these automatic events :
Start/Rotate/Stop. That is, in 4.x when we rotate a relay log, we don't want
a Rotate_log event to be written to the relay log. When we start a relay log
etc. So in 4.x this is 1 for relay logs, 0 for binlogs.
In 5.0 it's 0 for relay logs too!
*/
bool no_auto_events;
/*
The max size before rotation (usable only if log_type == LOG_BIN: binary
logs and relay logs).
For a binlog, max_size should be max_binlog_size.
For a relay log, it should be max_relay_log_size if this is non-zero,
max_binlog_size otherwise.
max_size is set in init(), and dynamically changed (when one does SET
GLOBAL MAX_BINLOG_SIZE|MAX_RELAY_LOG_SIZE) by fix_max_binlog_size and
fix_max_relay_log_size).
*/
ulong max_size;
ulong prepared_xids; /* for tc log - number of xids to remember */
pthread_mutex_t LOCK_prep_xids;
pthread_cond_t COND_prep_xids;
friend class Log_event;
public:
MYSQL_LOG();
/*
note that there's no destructor ~MYSQL_LOG() !
The reason is that we don't want it to be automatically called
on exit() - but only during the correct shutdown process
*/
int open(const char *opt_name);
void close();
int log(THD *thd, my_xid xid);
void unlog(ulong cookie, my_xid xid);
int recover(IO_CACHE *log, Format_description_log_event *fdle);
/*
These describe the log's format. This is used only for relay logs.
_for_exec is used by the SQL thread, _for_queue by the I/O thread. It's
necessary to have 2 distinct objects, because the I/O thread may be reading
events in a different format from what the SQL thread is reading (consider
the case of a master which has been upgraded from 5.0 to 5.1 without doing
RESET MASTER, or from 4.x to 5.0).
*/
Format_description_log_event *description_event_for_exec,
*description_event_for_queue;
void reset_bytes_written()
{
bytes_written = 0;
}
void harvest_bytes_written(ulonglong* counter)
{
#ifndef DBUG_OFF
char buf1[22],buf2[22];
#endif
DBUG_ENTER("harvest_bytes_written");
(*counter)+=bytes_written;
DBUG_PRINT("info",("counter: %s bytes_written: %s", llstr(*counter,buf1),
llstr(bytes_written,buf2)));
bytes_written=0;
DBUG_VOID_RETURN;
}
void set_max_size(ulong max_size_arg);
void signal_update();
void wait_for_update(THD* thd, bool master_or_slave);
void set_need_start_event() { need_start_event = 1; }
void init(enum_log_type log_type_arg,
enum cache_type io_cache_type_arg,
bool no_auto_events_arg, ulong max_size);
void init_pthread_objects();
void cleanup();
bool open(const char *log_name,
enum_log_type log_type,
const char *new_name,
enum cache_type io_cache_type_arg,
bool no_auto_events_arg, ulong max_size,
bool null_created);
const char *generate_name(const char *log_name, const char *suffix,
bool strip_ext, char *buff);
/* simplified open_xxx wrappers for the gigantic open above */
bool open_query_log(const char *log_name)
{
char buf[FN_REFLEN];
return open(generate_name(log_name, ".log", 0, buf),
LOG_NORMAL, 0, WRITE_CACHE, 0, 0, 0);
}
bool open_slow_log(const char *log_name)
{
char buf[FN_REFLEN];
return open(generate_name(log_name, "-slow.log", 0, buf),
LOG_NORMAL, 0, WRITE_CACHE, 0, 0, 0);
}
bool open_index_file(const char *index_file_name_arg,
const char *log_name);
void new_file(bool need_lock);
bool write(THD *thd, enum enum_server_command command,
const char *format,...);
bool write(THD *thd, const char *query, uint query_length,
time_t query_start=0);
bool write(Log_event* event_info); // binary log write
bool write(THD *thd, IO_CACHE *cache, Log_event *commit_event);
/*
v stands for vector
invoked as appendv(buf1,len1,buf2,len2,...,bufn,lenn,0)
*/
bool appendv(const char* buf,uint len,...);
bool append(Log_event* ev);
int generate_new_name(char *new_name,const char *old_name);
void make_log_name(char* buf, const char* log_ident);
bool is_active(const char* log_file_name);
int update_log_index(LOG_INFO* linfo, bool need_update_threads);
void rotate_and_purge(uint flags);
int purge_logs(const char *to_log, bool included,
bool need_mutex, bool need_update_threads,
ulonglong *decrease_log_space);
int purge_logs_before_date(time_t purge_time);
int purge_first_log(struct st_relay_log_info* rli, bool included);
bool reset_logs(THD* thd);
void close(uint exiting);
// iterating through the log index file
int find_log_pos(LOG_INFO* linfo, const char* log_name,
bool need_mutex);
int find_next_log(LOG_INFO* linfo, bool need_mutex);
int get_current_log(LOG_INFO* linfo);
uint next_file_id();
inline bool is_open() { return log_type != LOG_CLOSED; }
inline char* get_index_fname() { return index_file_name;}
inline char* get_log_fname() { return log_file_name; }
inline char* get_name() { return name; }
inline pthread_mutex_t* get_log_lock() { return &LOCK_log; }
inline IO_CACHE* get_log_file() { return &log_file; }
inline void lock_index() { pthread_mutex_lock(&LOCK_index);}
inline void unlock_index() { pthread_mutex_unlock(&LOCK_index);}
inline IO_CACHE *get_index_file() { return &index_file;}
inline uint32 get_open_count() { return open_count; }
};
/* character conversion tables */
typedef struct st_copy_info {
ha_rows records;
ha_rows deleted;
ha_rows updated;
ha_rows copied;
ha_rows error_count;
enum enum_duplicates handle_duplicates;
int escape_char, last_errno;
bool ignore;
/* for INSERT ... UPDATE */
List<Item> *update_fields;
List<Item> *update_values;
/* for VIEW ... WITH CHECK OPTION */
TABLE_LIST *view;
} COPY_INFO;
class key_part_spec :public Sql_alloc {
public:
const char *field_name;
uint length;
key_part_spec(const char *name,uint len=0) :field_name(name), length(len) {}
bool operator==(const key_part_spec& other) const;
};
class Alter_drop :public Sql_alloc {
public:
enum drop_type {KEY, COLUMN };
const char *name;
enum drop_type type;
Alter_drop(enum drop_type par_type,const char *par_name)
:name(par_name), type(par_type) {}
};
class Alter_column :public Sql_alloc {
public:
const char *name;
Item *def;
Alter_column(const char *par_name,Item *literal)
:name(par_name), def(literal) {}
};
class Key :public Sql_alloc {
public:
enum Keytype { PRIMARY, UNIQUE, MULTIPLE, FULLTEXT, SPATIAL, FOREIGN_KEY};
enum Keytype type;
enum ha_key_alg algorithm;
List<key_part_spec> columns;
const char *name;
bool generated;
Key(enum Keytype type_par, const char *name_arg, enum ha_key_alg alg_par,
bool generated_arg, List<key_part_spec> &cols)
:type(type_par), algorithm(alg_par), columns(cols), name(name_arg),
generated(generated_arg)
{}
~Key() {}
/* Equality comparison of keys (ignoring name) */
friend bool foreign_key_prefix(Key *a, Key *b);
};
class Table_ident;
class foreign_key: public Key {
public:
enum fk_match_opt { FK_MATCH_UNDEF, FK_MATCH_FULL,
FK_MATCH_PARTIAL, FK_MATCH_SIMPLE};
enum fk_option { FK_OPTION_UNDEF, FK_OPTION_RESTRICT, FK_OPTION_CASCADE,
FK_OPTION_SET_NULL, FK_OPTION_NO_ACTION, FK_OPTION_DEFAULT};
Table_ident *ref_table;
List<key_part_spec> ref_columns;
uint delete_opt, update_opt, match_opt;
foreign_key(const char *name_arg, List<key_part_spec> &cols,
Table_ident *table, List<key_part_spec> &ref_cols,
uint delete_opt_arg, uint update_opt_arg, uint match_opt_arg)
:Key(FOREIGN_KEY, name_arg, HA_KEY_ALG_UNDEF, 0, cols),
ref_table(table), ref_columns(cols),
delete_opt(delete_opt_arg), update_opt(update_opt_arg),
match_opt(match_opt_arg)
{}
};
typedef struct st_mysql_lock
{
TABLE **table;
uint table_count,lock_count;
THR_LOCK_DATA **locks;
} MYSQL_LOCK;
class LEX_COLUMN : public Sql_alloc
{
public:
String column;
uint rights;
LEX_COLUMN (const String& x,const uint& y ): column (x),rights (y) {}
};
#include "sql_lex.h" /* Must be here */
/* Needed to be able to have an I_List of char* strings in mysqld.cc. */
class i_string: public ilink
{
public:
char* ptr;
i_string():ptr(0) { }
i_string(char* s) : ptr(s) {}
};
/* needed for linked list of two strings for replicate-rewrite-db */
class i_string_pair: public ilink
{
public:
char* key;
char* val;
i_string_pair():key(0),val(0) { }
i_string_pair(char* key_arg, char* val_arg) : key(key_arg),val(val_arg) {}
};
class MYSQL_ERROR: public Sql_alloc
{
public:
enum enum_warning_level
{ WARN_LEVEL_NOTE, WARN_LEVEL_WARN, WARN_LEVEL_ERROR, WARN_LEVEL_END};
uint code;
enum_warning_level level;
char *msg;
MYSQL_ERROR(THD *thd, uint code_arg, enum_warning_level level_arg,
const char *msg_arg)
:code(code_arg), level(level_arg)
{
if (msg_arg)
set_msg(thd, msg_arg);
}
void set_msg(THD *thd, const char *msg_arg);
};
class delayed_insert;
class select_result;
#define THD_SENTRY_MAGIC 0xfeedd1ff
#define THD_SENTRY_GONE 0xdeadbeef
#define THD_CHECK_SENTRY(thd) DBUG_ASSERT(thd->dbug_sentry == THD_SENTRY_MAGIC)
struct system_variables
{
ulonglong myisam_max_extra_sort_file_size;
ulonglong myisam_max_sort_file_size;
ha_rows select_limit;
ha_rows max_join_size;
ulong auto_increment_increment, auto_increment_offset;
ulong bulk_insert_buff_size;
ulong join_buff_size;
ulong long_query_time;
ulong max_allowed_packet;
ulong max_error_count;
ulong max_heap_table_size;
ulong max_length_for_sort_data;
ulong max_sort_length;
ulong max_tmp_tables;
ulong max_insert_delayed_threads;
ulong multi_range_count;
ulong myisam_repair_threads;
ulong myisam_sort_buff_size;
ulong net_buffer_length;
ulong net_interactive_timeout;
ulong net_read_timeout;
ulong net_retry_count;
ulong net_wait_timeout;
ulong net_write_timeout;
ulong optimizer_prune_level;
ulong optimizer_search_depth;
ulong preload_buff_size;
ulong query_cache_type;
ulong read_buff_size;
ulong read_rnd_buff_size;
ulong sortbuff_size;
ulong table_type;
ulong tmp_table_size;
ulong tx_isolation;
ulong completion_type;
/* Determines which non-standard SQL behaviour should be enabled */
ulong sql_mode;
/* check of key presence in updatable view */
ulong updatable_views_with_limit;
ulong default_week_format;
ulong max_seeks_for_key;
ulong range_alloc_block_size;
ulong query_alloc_block_size;
ulong query_prealloc_size;
ulong trans_alloc_block_size;
ulong trans_prealloc_size;
ulong log_warnings;
ulong group_concat_max_len;
/*
In slave thread we need to know in behalf of which
thread the query is being run to replicate temp tables properly
*/
ulong pseudo_thread_id;
my_bool low_priority_updates;
my_bool new_mode;
my_bool query_cache_wlock_invalidate;
my_bool engine_condition_pushdown;
#ifdef HAVE_REPLICATION
ulong sync_replication;
ulong sync_replication_slave_id;
ulong sync_replication_timeout;
#endif /* HAVE_REPLICATION */
#ifdef HAVE_INNOBASE_DB
my_bool innodb_table_locks;
my_bool innodb_support_xa;
#endif /* HAVE_INNOBASE_DB */
#ifdef HAVE_NDBCLUSTER_DB
ulong ndb_autoincrement_prefetch_sz;
my_bool ndb_force_send;
my_bool ndb_use_exact_count;
my_bool ndb_use_transactions;
#endif /* HAVE_NDBCLUSTER_DB */
my_bool old_passwords;
/* Only charset part of these variables is sensible */
CHARSET_INFO *character_set_client;
CHARSET_INFO *character_set_results;
/* Both charset and collation parts of these variables are important */
CHARSET_INFO *collation_server;
CHARSET_INFO *collation_database;
CHARSET_INFO *collation_connection;
Time_zone *time_zone;
/* DATE, DATETIME and TIME formats */
DATE_TIME_FORMAT *date_format;
DATE_TIME_FORMAT *datetime_format;
DATE_TIME_FORMAT *time_format;
};
/* per thread status variables */
typedef struct system_status_var
{
ulong bytes_received;
ulong bytes_sent;
ulong com_other;
ulong com_stat[(uint) SQLCOM_END];
ulong created_tmp_disk_tables;
ulong created_tmp_tables;
ulong ha_commit_count;
ulong ha_delete_count;
ulong ha_read_first_count;
ulong ha_read_last_count;
ulong ha_read_key_count;
ulong ha_read_next_count;
ulong ha_read_prev_count;
ulong ha_read_rnd_count;
ulong ha_read_rnd_next_count;
ulong ha_rollback_count;
ulong ha_update_count;
ulong ha_write_count;
ulong ha_prepare_count;
ulong ha_discover_count;
ulong ha_savepoint_count;
ulong ha_savepoint_rollback_count;
/* KEY_CACHE parts. These are copies of the original */
ulong key_blocks_changed;
ulong key_blocks_used;
ulong key_cache_r_requests;
ulong key_cache_read;
ulong key_cache_w_requests;
ulong key_cache_write;
/* END OF KEY_CACHE parts */
ulong net_big_packet_count;
ulong opened_tables;
ulong select_full_join_count;
ulong select_full_range_join_count;
ulong select_range_count;
ulong select_range_check_count;
ulong select_scan_count;
ulong long_query_count;
ulong filesort_merge_passes;
ulong filesort_range_count;
ulong filesort_rows;
ulong filesort_scan_count;
} STATUS_VAR;
/*
This is used for 'show status'. It must be updated to the last ulong
variable in system_status_var
*/
#define last_system_status_var filesort_scan_count
void free_tmp_table(THD *thd, TABLE *entry);
class Item_arena
{
public:
/*
List of items created in the parser for this query. Every item puts
itself to the list on creation (see Item::Item() for details))
*/
Item *free_list;
MEM_ROOT main_mem_root;
MEM_ROOT *mem_root; // Pointer to current memroot
#ifndef DBUG_OFF
bool backup_arena;
#endif
enum enum_state
{
INITIALIZED= 0, PREPARED= 1, EXECUTED= 3, CONVENTIONAL_EXECUTION= 2,
ERROR= -1
};
enum_state state;
/* We build without RTTI, so dynamic_cast can't be used. */
enum Type
{
STATEMENT, PREPARED_STATEMENT, STORED_PROCEDURE
};
/*
This constructor is used only when Item_arena is created as
backup storage for another instance of Item_arena.
*/
Item_arena() {};
/*
Create arena for already constructed THD using its variables as
parameters for memory root initialization.
*/
Item_arena(THD *thd);
/*
Create arena and optionally init memory root with minimal values.
Particularly used if Item_arena is part of Statement.
*/
Item_arena(bool init_mem_root);
virtual Type type() const;
virtual ~Item_arena() {};
inline bool is_stmt_prepare() const { return (int)state < (int)PREPARED; }
inline bool is_first_stmt_execute() const { return state == PREPARED; }
inline bool is_stmt_execute() const
{ return state == PREPARED || state == EXECUTED; }
inline bool is_conventional() const
{ return state == CONVENTIONAL_EXECUTION; }
inline gptr alloc(unsigned int size) { return alloc_root(mem_root,size); }
inline gptr calloc(unsigned int size)
{
gptr ptr;
if ((ptr=alloc_root(mem_root,size)))
bzero((char*) ptr,size);
return ptr;
}
inline char *strdup(const char *str)
{ return strdup_root(mem_root,str); }
inline char *strmake(const char *str, uint size)
{ return strmake_root(mem_root,str,size); }
inline char *memdup(const char *str, uint size)
{ return memdup_root(mem_root,str,size); }
inline char *memdup_w_gap(const char *str, uint size, uint gap)
{
gptr ptr;
if ((ptr=alloc_root(mem_root,size+gap)))
memcpy(ptr,str,size);
return ptr;
}
void set_n_backup_item_arena(Item_arena *set, Item_arena *backup);
void restore_backup_item_arena(Item_arena *set, Item_arena *backup);
void set_item_arena(Item_arena *set);
};
class Cursor;
/*
State of a single command executed against this connection.
One connection can contain a lot of simultaneously running statements,
some of which could be:
- prepared, that is, contain placeholders,
- opened as cursors. We maintain 1 to 1 relationship between
statement and cursor - if user wants to create another cursor for his
query, we create another statement for it.
To perform some action with statement we reset THD part to the state of
that statement, do the action, and then save back modified state from THD
to the statement. It will be changed in near future, and Statement will
be used explicitly.
*/
class Statement: public Item_arena
{
Statement(const Statement &rhs); /* not implemented: */
Statement &operator=(const Statement &rhs); /* non-copyable */
public:
/* FIXME: must be private */
LEX main_lex;
/*
Uniquely identifies each statement object in thread scope; change during
statement lifetime. FIXME: must be const
*/
ulong id;
/*
- if set_query_id=1, we set field->query_id for all fields. In that case
field list can not contain duplicates.
*/
bool set_query_id;
/*
This variable is used in post-parse stage to declare that sum-functions,
or functions which have sense only if GROUP BY is present, are allowed.
For example in queries
SELECT MIN(i) FROM foo
SELECT GROUP_CONCAT(a, b, MIN(i)) FROM ... GROUP BY ...
MIN(i) have no sense.
Though it's grammar-related issue, it's hard to catch it out during the
parse stage because GROUP BY clause goes in the end of query. This
variable is mainly used in setup_fields/fix_fields.
See item_sum.cc for details.
*/
bool allow_sum_func;
LEX_STRING name; /* name for named prepared statements */
LEX *lex; // parse tree descriptor
/*
Points to the query associated with this statement. It's const, but
we need to declare it char * because all table handlers are written
in C and need to point to it.
Note that (A) if we set query = NULL, we must at the same time set
query_length = 0, and protect the whole operation with the
LOCK_thread_count mutex. And (B) we are ONLY allowed to set query to a
non-NULL value if its previous value is NULL. We do not need to protect
operation (B) with any mutex. To avoid crashes in races, if we do not
know that thd->query cannot change at the moment, one should print
thd->query like this:
(1) reserve the LOCK_thread_count mutex;
(2) check if thd->query is NULL;
(3) if not NULL, then print at most thd->query_length characters from
it. We will see the query_length field as either 0, or the right value
for it.
Assuming that the write and read of an n-bit memory field in an n-bit
computer is atomic, we can avoid races in the above way.
This printing is needed at least in SHOW PROCESSLIST and SHOW INNODB
STATUS.
*/
char *query;
uint32 query_length; // current query length
Cursor *cursor;
public:
/*
This constructor is called when statement is a subobject of THD:
some variables are initialized in THD::init due to locking problems
*/
Statement();
Statement(THD *thd);
virtual ~Statement();
/* Assign execution context (note: not all members) of given stmt to self */
void set_statement(Statement *stmt);
void set_n_backup_statement(Statement *stmt, Statement *backup);
void restore_backup_statement(Statement *stmt, Statement *backup);
/* return class type */
virtual Type type() const;
};
/*
Container for all statements created/used in a connection.
Statements in Statement_map have unique Statement::id (guaranteed by id
assignment in Statement::Statement)
Non-empty statement names are unique too: attempt to insert a new statement
with duplicate name causes older statement to be deleted
Statements are auto-deleted when they are removed from the map and when the
map is deleted.
*/
class Statement_map
{
public:
Statement_map();
int insert(Statement *statement);
Statement *find_by_name(LEX_STRING *name)
{
Statement *stmt;
stmt= (Statement*)hash_search(&names_hash, (byte*)name->str,
name->length);
return stmt;
}
Statement *find(ulong id)
{
if (last_found_statement == 0 || id != last_found_statement->id)
{
Statement *stmt;
stmt= (Statement *) hash_search(&st_hash, (byte *) &id, sizeof(id));
if (stmt && stmt->name.str)
return NULL;
last_found_statement= stmt;
}
return last_found_statement;
}
void erase(Statement *statement)
{
if (statement == last_found_statement)
last_found_statement= 0;
if (statement->name.str)
{
hash_delete(&names_hash, (byte *) statement);
}
hash_delete(&st_hash, (byte *) statement);
}
/* Erase all statements (calls Statement destructor) */
void reset()
{
my_hash_reset(&names_hash);
my_hash_reset(&st_hash);
last_found_statement= 0;
}
~Statement_map()
{
hash_free(&names_hash);
hash_free(&st_hash);
}
private:
HASH st_hash;
HASH names_hash;
Statement *last_found_statement;
};
struct st_savepoint {
struct st_savepoint *prev;
char *name;
uint length, nht;
};
enum xa_states {XA_NOTR=0, XA_ACTIVE, XA_IDLE, XA_PREPARED};
extern const char *xa_state_names[];
/*
A registry for item tree transformations performed during
query optimization. We register only those changes which require
a rollback to re-execute a prepared statement or stored procedure
yet another time.
*/
struct Item_change_record;
typedef I_List<Item_change_record> Item_change_list;
/*
Type of prelocked mode.
See comment for THD::prelocked_mode for complete description.
*/
enum prelocked_mode_type {NON_PRELOCKED= 0, PRELOCKED= 1,
PRELOCKED_UNDER_LOCK_TABLES= 2};
/*
For each client connection we create a separate thread with THD serving as
a thread/connection descriptor
*/
class THD :public ilink,
public Statement
{
public:
#ifdef EMBEDDED_LIBRARY
struct st_mysql *mysql;
struct st_mysql_data *data;
unsigned long client_stmt_id;
unsigned long client_param_count;
struct st_mysql_bind *client_params;
char *extra_data;
ulong extra_length;
String query_rest;
#endif
NET net; // client connection descriptor
MEM_ROOT warn_root; // For warnings and errors
Protocol *protocol; // Current protocol
Protocol_simple protocol_simple; // Normal protocol
Protocol_prep protocol_prep; // Binary protocol
HASH user_vars; // hash for user variables
String packet; // dynamic buffer for network I/O
String convert_buffer; // buffer for charset conversions
struct sockaddr_in remote; // client socket address
struct rand_struct rand; // used for authentication
struct system_variables variables; // Changeable local variables
struct system_status_var status_var; // Per thread statistic vars
pthread_mutex_t LOCK_delete; // Locked before thd is deleted
/* all prepared statements and cursors of this connection */
Statement_map stmt_map;
/*
keeps THD state while it is used for active statement
Note: we perform special cleanup for it in THD destructor.
*/
Statement stmt_backup;
/*
A pointer to the stack frame of handle_one_connection(),
which is called first in the thread for handling a client
*/
char *thread_stack;
/*
host - host of the client
user - user of the client, set to NULL until the user has been read from
the connection
priv_user - The user privilege we are using. May be '' for anonymous user.
db - currently selected database
catalog - currently selected catalog
ip - client IP
WARNING: some members of THD (currently 'db', 'catalog' and 'query') are
set and alloced by the slave SQL thread (for the THD of that thread); that
thread is (and must remain, for now) the only responsible for freeing these
3 members. If you add members here, and you add code to set them in
replication, don't forget to free_them_and_set_them_to_0 in replication
properly. For details see the 'err:' label of the pthread_handler_decl of
the slave SQL thread, in sql/slave.cc.
*/
char *host,*user,*priv_user,*db,*catalog,*ip;
char priv_host[MAX_HOSTNAME];
/* remote (peer) port */
uint16 peer_port;
/*
Points to info-string that we show in SHOW PROCESSLIST
You are supposed to update thd->proc_info only if you have coded
a time-consuming piece that MySQL can get stuck in for a long time.
*/
const char *proc_info;
/* points to host if host is available, otherwise points to ip */
const char *host_or_ip;
ulong client_capabilities; /* What the client supports */
ulong max_client_packet_length;
ulong master_access; /* Global privileges from mysql.user */
ulong db_access; /* Privileges for current db */
/*
open_tables - list of regular tables in use by this thread
temporary_tables - list of temp tables in use by this thread
handler_tables - list of tables that were opened with HANDLER OPEN
and are still in use by this thread
*/
TABLE *open_tables,*temporary_tables, *handler_tables, *derived_tables;
/*
During a MySQL session, one can lock tables in two modes: automatic
or manual. In automatic mode all necessary tables are locked just before
statement execution, and all acquired locks are stored in 'lock'
member. Unlocking takes place automatically as well, when the
statement ends.
Manual mode comes into play when a user issues a 'LOCK TABLES'
statement. In this mode the user can only use the locked tables.
Trying to use any other tables will give an error. The locked tables are
stored in 'locked_tables' member. Manual locking is described in
the 'LOCK_TABLES' chapter of the MySQL manual.
See also lock_tables() for details.
*/
MYSQL_LOCK *lock; /* Current locks */
/*
Tables that were locked with explicit or implicit LOCK TABLES.
(Implicit LOCK TABLES happens when we are prelocking tables for
execution of statement which uses stored routines. See description
THD::prelocked_mode for more info.)
*/
MYSQL_LOCK *locked_tables;
HASH handler_tables_hash;
/*
One thread can hold up to one named user-level lock. This variable
points to a lock object if the lock is present. See item_func.cc and
chapter 'Miscellaneous functions', for functions GET_LOCK, RELEASE_LOCK.
*/
User_level_lock *ull;
#ifndef DBUG_OFF
uint dbug_sentry; // watch out for memory corruption
#endif
struct st_my_thread_var *mysys_var;
/*
Type of current query: COM_PREPARE, COM_QUERY, etc. Set from
first byte of the packet in do_command()
*/
enum enum_server_command command;
uint32 server_id;
uint32 file_id; // for LOAD DATA INFILE
/*
Used in error messages to tell user in what part of MySQL we found an
error. E. g. when where= "having clause", if fix_fields() fails, user
will know that the error was in having clause.
*/
const char *where;
time_t start_time,time_after_lock,user_time;
time_t connect_time,thr_create_time; // track down slow pthread_create
thr_lock_type update_lock_default;
delayed_insert *di;
my_bool tablespace_op; /* This is TRUE in DISCARD/IMPORT TABLESPACE */
/* container for handler's private per-connection data */
void *ha_data[MAX_HA];
struct st_transactions {
SAVEPOINT *savepoints;
THD_TRANS all; // Trans since BEGIN WORK
THD_TRANS stmt; // Trans for current statement
bool on; // see ha_enable_transaction()
XID xid; // transaction identifier
enum xa_states xa_state; // used by external XA only
/*
Tables changed in transaction (that must be invalidated in query cache).
List contain only transactional tables, that not invalidated in query
cache (instead of full list of changed in transaction tables).
*/
CHANGED_TABLE_LIST* changed_tables;
MEM_ROOT mem_root; // Transaction-life memory allocation pool
void cleanup()
{
changed_tables= 0;
savepoints= 0;
#ifdef USING_TRANSACTIONS
free_root(&mem_root,MYF(MY_KEEP_PREALLOC));
#endif
}
#ifdef USING_TRANSACTIONS
st_transactions()
{
bzero((char*)this, sizeof(*this));
xid.null();
init_sql_alloc(&mem_root, ALLOC_ROOT_MIN_BLOCK_SIZE, 0);
}
#endif
} transaction;
Field *dupp_field;
#ifndef __WIN__
sigset_t signals,block_signals;
#endif
#ifdef SIGNAL_WITH_VIO_CLOSE
Vio* active_vio;
#endif
/*
This is to track items changed during execution of a prepared
statement/stored procedure. It's created by
register_item_tree_change() in memory root of THD, and freed in
rollback_item_tree_changes(). For conventional execution it's always 0.
*/
Item_change_list change_list;
/*
Current prepared Item_arena if there one, or 0
*/
Item_arena *current_arena;
/*
next_insert_id is set on SET INSERT_ID= #. This is used as the next
generated auto_increment value in handler.cc
*/
ulonglong next_insert_id;
/* Remember last next_insert_id to reset it if something went wrong */
ulonglong prev_insert_id;
/*
The insert_id used for the last statement or set by SET LAST_INSERT_ID=#
or SELECT LAST_INSERT_ID(#). Used for binary log and returned by
LAST_INSERT_ID()
*/
ulonglong last_insert_id;
/*
Set to the first value that LAST_INSERT_ID() returned for the last
statement. When this is set, last_insert_id_used is set to true.
*/
ulonglong current_insert_id;
ulonglong limit_found_rows;
ha_rows cuted_fields,
sent_row_count, examined_row_count;
table_map used_tables;
USER_CONN *user_connect;
CHARSET_INFO *db_charset;
/*
FIXME: this, and some other variables like 'count_cuted_fields'
maybe should be statement/cursor local, that is, moved to Statement
class. With current implementation warnings produced in each prepared
statement/cursor settle here.
*/
List <MYSQL_ERROR> warn_list;
uint warn_count[(uint) MYSQL_ERROR::WARN_LEVEL_END];
uint total_warn_count;
/*
Id of current query. Statement can be reused to execute several queries
query_id is global in context of the whole MySQL server.
ID is automatically generated from mutex-protected counter.
It's used in handler code for various purposes: to check which columns
from table are necessary for this select, to check if it's necessary to
update auto-updatable fields (like auto_increment and timestamp).
*/
query_id_t query_id, warn_id;
ulong version, options, thread_id, col_access;
/* Statement id is thread-wide. This counter is used to generate ids */
ulong statement_id_counter;
ulong rand_saved_seed1, rand_saved_seed2;
ulong row_count; // Row counter, mainly for errors and warnings
long dbug_thread_id;
pthread_t real_id;
uint current_tablenr,tmp_table,global_read_lock;
uint server_status,open_options,system_thread;
uint32 db_length;
uint select_number; //number of select (used for EXPLAIN)
/* variables.transaction_isolation is reset to this after each commit */
enum_tx_isolation session_tx_isolation;
enum_check_fields count_cuted_fields;
/* for user variables replication*/
DYNAMIC_ARRAY user_var_events;
enum killed_state { NOT_KILLED=0, KILL_BAD_DATA=1, KILL_CONNECTION=ER_SERVER_SHUTDOWN, KILL_QUERY=ER_QUERY_INTERRUPTED };
killed_state volatile killed;
/* scramble - random string sent to client on handshake */
char scramble[SCRAMBLE_LENGTH+1];
bool slave_thread, one_shot_set;
bool locked, some_tables_deleted;
bool last_cuted_field;
bool no_errors, password, is_fatal_error;
bool query_start_used, rand_used, time_zone_used;
bool last_insert_id_used,insert_id_used, clear_next_insert_id;
bool in_lock_tables;
bool query_error, bootstrap, cleanup_done;
bool tmp_table_used;
bool charset_is_system_charset, charset_is_collation_connection;
bool slow_command;
bool no_trans_update, abort_on_warning;
bool got_warning; /* Set on call to push_warning() */
bool no_warnings_for_error; /* no warnings on call to my_error() */
/* set during loop of derived table processing */
bool derived_tables_processing;
longlong row_count_func; /* For the ROW_COUNT() function */
sp_rcontext *spcont; // SP runtime context
sp_cache *sp_proc_cache;
sp_cache *sp_func_cache;
/*
If we do a purge of binary logs, log index info of the threads
that are currently reading it needs to be adjusted. To do that
each thread that is using LOG_INFO needs to adjust the pointer to it
*/
LOG_INFO* current_linfo;
NET* slave_net; // network connection from slave -> m.
/* Used by the sys_var class to store temporary values */
union
{
my_bool my_bool_value;
long long_value;
} sys_var_tmp;
/*
prelocked_mode_type enum and prelocked_mode member are used for
indicating whenever "prelocked mode" is on, and what type of
"prelocked mode" is it.
Prelocked mode is used for execution of queries which explicitly
or implicitly (via views or triggers) use functions, thus may need
some additional tables (mentioned in query table list) for their
execution.
First open_tables() call for such query will analyse all functions
used by it and add all additional tables to table its list. It will
also mark this query as requiring prelocking. After that lock_tables()
will issue implicit LOCK TABLES for the whole table list and change
thd::prelocked_mode to non-0. All queries called in functions invoked
by the main query will use prelocked tables. Non-0 prelocked_mode
will also surpress mentioned analysys in those queries thus saving
cycles. Prelocked mode will be turned off once close_thread_tables()
for the main query will be called.
Note: Since not all "tables" present in table list are really locked
thd::relocked_mode does not imply thd::locked_tables.
*/
prelocked_mode_type prelocked_mode;
THD();
~THD();
void init(void);
/*
Initialize memory roots necessary for query processing and (!)
pre-allocate memory for it. We can't do that in THD constructor because
there are use cases (acl_init, delayed inserts, watcher threads,
killing mysqld) where it's vital to not allocate excessive and not used
memory. Note, that we still don't return error from init_for_queries():
if preallocation fails, we should notice that at the first call to
alloc_root.
*/
void init_for_queries();
void change_user(void);
void cleanup(void);
void cleanup_after_query();
bool store_globals();
#ifdef SIGNAL_WITH_VIO_CLOSE
inline void set_active_vio(Vio* vio)
{
pthread_mutex_lock(&LOCK_delete);
active_vio = vio;
pthread_mutex_unlock(&LOCK_delete);
}
inline void clear_active_vio()
{
pthread_mutex_lock(&LOCK_delete);
active_vio = 0;
pthread_mutex_unlock(&LOCK_delete);
}
void close_active_vio();
#endif
void awake(THD::killed_state state_to_set);
/*
For enter_cond() / exit_cond() to work the mutex must be got before
enter_cond() (in 4.1 an assertion will soon ensure this); this mutex is
then released by exit_cond(). Use must be:
lock mutex; enter_cond(); your code; exit_cond().
*/
inline const char* enter_cond(pthread_cond_t *cond, pthread_mutex_t* mutex,
const char* msg)
{
const char* old_msg = proc_info;
mysys_var->current_mutex = mutex;
mysys_var->current_cond = cond;
proc_info = msg;
return old_msg;
}
inline void exit_cond(const char* old_msg)
{
/*
Putting the mutex unlock in exit_cond() ensures that
mysys_var->current_mutex is always unlocked _before_ mysys_var->mutex is
locked (if that would not be the case, you'll get a deadlock if someone
does a THD::awake() on you).
*/
pthread_mutex_unlock(mysys_var->current_mutex);
pthread_mutex_lock(&mysys_var->mutex);
mysys_var->current_mutex = 0;
mysys_var->current_cond = 0;
proc_info = old_msg;
pthread_mutex_unlock(&mysys_var->mutex);
}
inline time_t query_start() { query_start_used=1; return start_time; }
inline void set_time() { if (user_time) start_time=time_after_lock=user_time; else time_after_lock=time(&start_time); }
inline void end_time() { time(&start_time); }
inline void set_time(time_t t) { time_after_lock=start_time=user_time=t; }
inline void lock_time() { time(&time_after_lock); }
inline void insert_id(ulonglong id_arg)
{
last_insert_id= id_arg;
insert_id_used=1;
}
inline ulonglong insert_id(void)
{
if (!last_insert_id_used)
{
last_insert_id_used=1;
current_insert_id=last_insert_id;
}
return last_insert_id;
}
inline ulonglong found_rows(void)
{
return limit_found_rows;
}
inline bool active_transaction()
{
#ifdef USING_TRANSACTIONS
return server_status & SERVER_STATUS_IN_TRANS;
#else
return 0;
#endif
}
inline bool only_prepare()
{
return command == COM_PREPARE;
}
inline bool fill_derived_tables()
{
return !only_prepare() && !lex->only_view_structure();
}
inline gptr trans_alloc(unsigned int size)
{
return alloc_root(&transaction.mem_root,size);
}
bool convert_string(LEX_STRING *to, CHARSET_INFO *to_cs,
const char *from, uint from_length,
CHARSET_INFO *from_cs);
bool convert_string(String *s, CHARSET_INFO *from_cs, CHARSET_INFO *to_cs);
void add_changed_table(TABLE *table);
void add_changed_table(const char *key, long key_length);
CHANGED_TABLE_LIST * changed_table_dup(const char *key, long key_length);
int send_explain_fields(select_result *result);
#ifndef EMBEDDED_LIBRARY
inline void clear_error()
{
net.last_error[0]= 0;
net.last_errno= 0;
net.report_error= 0;
query_error= 0;
}
inline bool vio_ok() const { return net.vio != 0; }
#else
void clear_error();
inline bool vio_ok() const { return true; }
#endif
inline void fatal_error()
{
is_fatal_error= 1;
net.report_error= 1;
DBUG_PRINT("error",("Fatal error set"));
}
inline CHARSET_INFO *charset() { return variables.character_set_client; }
void update_charset();
inline Item_arena *change_arena_if_needed(Item_arena *backup)
{
/*
use new arena if we are in a prepared statements and we have not
already changed to use this arena.
*/
if (!current_arena->is_conventional() &&
mem_root != &current_arena->main_mem_root)
{
set_n_backup_item_arena(current_arena, backup);
return current_arena;
}
return 0;
}
void change_item_tree(Item **place, Item *new_value)
{
/* TODO: check for OOM condition here */
if (!current_arena->is_conventional())
nocheck_register_item_tree_change(place, *place, mem_root);
*place= new_value;
}
void nocheck_register_item_tree_change(Item **place, Item *old_value,
MEM_ROOT *runtime_memroot);
void rollback_item_tree_changes();
/*
Cleanup statement parse state (parse tree, lex) and execution
state after execution of a non-prepared SQL statement.
*/
void end_statement();
inline int killed_errno() const
{
return killed != KILL_BAD_DATA ? killed : 0;
}
inline void send_kill_message() const
{
int err= killed_errno();
my_message(err, ER(err), MYF(0));
}
/* return TRUE if we will abort query if we make a warning now */
inline bool really_abort_on_warning()
{
return (abort_on_warning &&
(!no_trans_update ||
(variables.sql_mode & MODE_STRICT_ALL_TABLES)));
}
void set_status_var_init();
};
#define tmp_disable_binlog(A) \
ulong save_options= (A)->options; \
(A)->options&= ~OPTION_BIN_LOG;
#define reenable_binlog(A) (A)->options= save_options;
/* Flags for the THD::system_thread (bitmap) variable */
#define SYSTEM_THREAD_DELAYED_INSERT 1
#define SYSTEM_THREAD_SLAVE_IO 2
#define SYSTEM_THREAD_SLAVE_SQL 4
/*
Used to hold information about file and file structure in exchainge
via non-DB file (...INTO OUTFILE..., ...LOAD DATA...)
XXX: We never call destructor for objects of this class.
*/
class sql_exchange :public Sql_alloc
{
public:
char *file_name;
String *field_term,*enclosed,*line_term,*line_start,*escaped;
bool opt_enclosed;
bool dumpfile;
ulong skip_lines;
sql_exchange(char *name,bool dumpfile_flag);
};
#include "log_event.h"
/*
This is used to get result from a select
*/
class JOIN;
class select_result :public Sql_alloc {
protected:
THD *thd;
SELECT_LEX_UNIT *unit;
public:
select_result();
virtual ~select_result() {};
virtual int prepare(List<Item> &list, SELECT_LEX_UNIT *u)
{
unit= u;
return 0;
}
virtual int prepare2(void) { return 0; }
/*
Because of peculiarities of prepared statements protocol
we need to know number of columns in the result set (if
there is a result set) apart from sending columns metadata.
*/
virtual uint field_count(List<Item> &fields) const
{ return fields.elements; }
virtual bool send_fields(List<Item> &list, uint flags)=0;
virtual bool send_data(List<Item> &items)=0;
virtual bool initialize_tables (JOIN *join=0) { return 0; }
virtual void send_error(uint errcode,const char *err);
virtual bool send_eof()=0;
virtual bool simple_select() { return 0; }
virtual void abort() {}
/*
Cleanup instance of this class for next execution of a prepared
statement/stored procedure.
*/
virtual void cleanup();
};
/*
Base class for select_result descendands which intercept and
transform result set rows. As the rows are not sent to the client,
sending of result set metadata should be suppressed as well.
*/
class select_result_interceptor: public select_result
{
public:
uint field_count(List<Item> &fields) const { return 0; }
bool send_fields(List<Item> &fields, uint flag) { return FALSE; }
};
class select_send :public select_result {
public:
select_send() {}
bool send_fields(List<Item> &list, uint flags);
bool send_data(List<Item> &items);
bool send_eof();
bool simple_select() { return 1; }
};
class select_to_file :public select_result_interceptor {
protected:
sql_exchange *exchange;
File file;
IO_CACHE cache;
ha_rows row_count;
char path[FN_REFLEN];
public:
select_to_file(sql_exchange *ex) :exchange(ex), file(-1),row_count(0L)
{ path[0]=0; }
~select_to_file();
void send_error(uint errcode,const char *err);
bool send_eof();
void cleanup();
};
class select_export :public select_to_file {
uint field_term_length;
int field_sep_char,escape_char,line_sep_char;
bool fixed_row_size;
public:
select_export(sql_exchange *ex) :select_to_file(ex) {}
~select_export();
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_data(List<Item> &items);
};
class select_dump :public select_to_file {
public:
select_dump(sql_exchange *ex) :select_to_file(ex) {}
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_data(List<Item> &items);
};
class select_insert :public select_result_interceptor {
public:
TABLE_LIST *table_list;
TABLE *table;
List<Item> *fields;
ulonglong last_insert_id;
COPY_INFO info;
bool insert_into_view;
select_insert(TABLE_LIST *table_list_par,
TABLE *table_par, List<Item> *fields_par,
List<Item> *update_fields, List<Item> *update_values,
enum_duplicates duplic, bool ignore);
~select_insert();
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
int prepare2(void);
bool send_data(List<Item> &items);
virtual void store_values(List<Item> &values);
void send_error(uint errcode,const char *err);
bool send_eof();
/* not implemented: select_insert is never re-used in prepared statements */
void cleanup();
};
class select_create: public select_insert {
ORDER *group;
TABLE_LIST *create_table;
List<create_field> *extra_fields;
List<Key> *keys;
HA_CREATE_INFO *create_info;
MYSQL_LOCK *lock;
Field **field;
public:
select_create (TABLE_LIST *table,
HA_CREATE_INFO *create_info_par,
List<create_field> &fields_par,
List<Key> &keys_par,
List<Item> &select_fields,enum_duplicates duplic, bool ignore)
:select_insert (NULL, NULL, &select_fields, 0, 0, duplic, ignore), create_table(table),
extra_fields(&fields_par),keys(&keys_par), create_info(create_info_par),
lock(0)
{}
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
void store_values(List<Item> &values);
void send_error(uint errcode,const char *err);
bool send_eof();
void abort();
};
#include <myisam.h>
/*
Param to create temporary tables when doing SELECT:s
NOTE
This structure is copied using memcpy as a part of JOIN.
*/
class TMP_TABLE_PARAM :public Sql_alloc
{
private:
/* Prevent use of these (not safe because of lists and copy_field) */
TMP_TABLE_PARAM(const TMP_TABLE_PARAM &);
void operator=(TMP_TABLE_PARAM &);
public:
List<Item> copy_funcs;
List<Item> save_copy_funcs;
Copy_field *copy_field, *copy_field_end;
Copy_field *save_copy_field, *save_copy_field_end;
byte *group_buff;
Item **items_to_copy; /* Fields in tmp table */
MI_COLUMNDEF *recinfo,*start_recinfo;
KEY *keyinfo;
ha_rows end_write_records;
uint field_count,sum_func_count,func_count;
uint hidden_field_count;
uint group_parts,group_length,group_null_parts;
uint quick_group;
bool using_indirect_summary_function;
/* If >0 convert all blob fields to varchar(convert_blob_length) */
uint convert_blob_length;
CHARSET_INFO *table_charset;
bool schema_table;
TMP_TABLE_PARAM()
:copy_field(0), group_parts(0),
group_length(0), group_null_parts(0), convert_blob_length(0),
schema_table(0)
{}
~TMP_TABLE_PARAM()
{
cleanup();
}
void init(void);
inline void cleanup(void)
{
if (copy_field) /* Fix for Intel compiler */
{
delete [] copy_field;
save_copy_field= copy_field= 0;
}
}
};
class select_union :public select_result_interceptor {
public:
TABLE *table;
TMP_TABLE_PARAM tmp_table_param;
select_union(TABLE *table_par);
~select_union();
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_data(List<Item> &items);
bool send_eof();
bool flush();
void set_table(TABLE *tbl) { table= tbl; }
};
/* Base subselect interface class */
class select_subselect :public select_result_interceptor
{
protected:
Item_subselect *item;
public:
select_subselect(Item_subselect *item);
bool send_data(List<Item> &items)=0;
bool send_eof() { return 0; };
};
/* Single value subselect interface class */
class select_singlerow_subselect :public select_subselect
{
public:
select_singlerow_subselect(Item_subselect *item):select_subselect(item){}
bool send_data(List<Item> &items);
};
/* used in independent ALL/ANY optimisation */
class select_max_min_finder_subselect :public select_subselect
{
Item_cache *cache;
bool (select_max_min_finder_subselect::*op)();
bool fmax;
public:
select_max_min_finder_subselect(Item_subselect *item, bool mx)
:select_subselect(item), cache(0), fmax(mx)
{}
void cleanup();
bool send_data(List<Item> &items);
bool cmp_real();
bool cmp_int();
bool cmp_decimal();
bool cmp_str();
};
/* EXISTS subselect interface class */
class select_exists_subselect :public select_subselect
{
public:
select_exists_subselect(Item_subselect *item):select_subselect(item){}
bool send_data(List<Item> &items);
};
/* Structs used when sorting */
typedef struct st_sort_field {
Field *field; /* Field to sort */
Item *item; /* Item if not sorting fields */
uint length; /* Length of sort field */
Item_result result_type; /* Type of item */
bool reverse; /* if descending sort */
bool need_strxnfrm; /* If we have to use strxnfrm() */
} SORT_FIELD;
typedef struct st_sort_buffer {
uint index; /* 0 or 1 */
uint sort_orders;
uint change_pos; /* If sort-fields changed */
char **buff;
SORT_FIELD *sortorder;
} SORT_BUFFER;
/* Structure for db & table in sql_yacc */
class Table_ident :public Sql_alloc
{
public:
LEX_STRING db;
LEX_STRING table;
SELECT_LEX_UNIT *sel;
inline Table_ident(THD *thd, LEX_STRING db_arg, LEX_STRING table_arg,
bool force)
:table(table_arg), sel((SELECT_LEX_UNIT *)0)
{
if (!force && (thd->client_capabilities & CLIENT_NO_SCHEMA))
db.str=0;
else
db= db_arg;
}
inline Table_ident(LEX_STRING table_arg)
:table(table_arg), sel((SELECT_LEX_UNIT *)0)
{
db.str=0;
}
inline Table_ident(SELECT_LEX_UNIT *s) : sel(s)
{
/* We must have a table name here as this is used with add_table_to_list */
db.str=0; table.str= internal_table_name; table.length=1;
}
inline void change_db(char *db_name)
{
db.str= db_name; db.length= (uint) strlen(db_name);
}
};
// this is needed for user_vars hash
class user_var_entry
{
public:
LEX_STRING name;
char *value;
ulong length;
query_id_t update_query_id, used_query_id;
Item_result type;
double val_real(my_bool *null_value);
longlong val_int(my_bool *null_value);
String *val_str(my_bool *null_value, String *str, uint decimals);
my_decimal *val_decimal(my_bool *null_value, my_decimal *result);
DTCollation collation;
};
/*
Unique -- class for unique (removing of duplicates).
Puts all values to the TREE. If the tree becomes too big,
it's dumped to the file. User can request sorted values, or
just iterate through them. In the last case tree merging is performed in
memory simultaneously with iteration, so it should be ~2-3x faster.
*/
class Unique :public Sql_alloc
{
DYNAMIC_ARRAY file_ptrs;
ulong max_elements, max_in_memory_size;
IO_CACHE file;
TREE tree;
byte *record_pointers;
bool flush();
uint size;
public:
ulong elements;
Unique(qsort_cmp2 comp_func, void *comp_func_fixed_arg,
uint size_arg, ulong max_in_memory_size_arg);
~Unique();
ulong elements_in_tree() { return tree.elements_in_tree; }
inline bool unique_add(void *ptr)
{
DBUG_ENTER("unique_add");
DBUG_PRINT("info", ("tree %u - %u", tree.elements_in_tree, max_elements));
if (tree.elements_in_tree > max_elements && flush())
DBUG_RETURN(1);
DBUG_RETURN(!tree_insert(&tree, ptr, 0, tree.custom_arg));
}
bool get(TABLE *table);
static double get_use_cost(uint *buffer, uint nkeys, uint key_size,
ulong max_in_memory_size);
inline static int get_cost_calc_buff_size(ulong nkeys, uint key_size,
ulong max_in_memory_size)
{
register ulong max_elems_in_tree=
(1 + max_in_memory_size / ALIGN_SIZE(sizeof(TREE_ELEMENT)+key_size));
return sizeof(uint)*(1 + nkeys/max_elems_in_tree);
}
void reset();
bool walk(tree_walk_action action, void *walk_action_arg);
friend int unique_write_to_file(gptr key, element_count count, Unique *unique);
friend int unique_write_to_ptrs(gptr key, element_count count, Unique *unique);
};
class multi_delete :public select_result_interceptor
{
TABLE_LIST *delete_tables, *table_being_deleted;
Unique **tempfiles;
THD *thd;
ha_rows deleted, found;
uint num_of_tables;
int error;
bool do_delete, transactional_tables, normal_tables;
public:
multi_delete(THD *thd, TABLE_LIST *dt, uint num_of_tables);
~multi_delete();
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_data(List<Item> &items);
bool initialize_tables (JOIN *join);
void send_error(uint errcode,const char *err);
int do_deletes (bool from_send_error);
bool send_eof();
};
class multi_update :public select_result_interceptor
{
TABLE_LIST *all_tables; /* query/update command tables */
TABLE_LIST *leaves; /* list of leves of join table tree */
TABLE_LIST *update_tables, *table_being_updated;
THD *thd;
TABLE **tmp_tables, *main_table, *table_to_update;
TMP_TABLE_PARAM *tmp_table_param;
ha_rows updated, found;
List <Item> *fields, *values;
List <Item> **fields_for_table, **values_for_table;
uint table_count;
Copy_field *copy_field;
enum enum_duplicates handle_duplicates;
bool do_update, trans_safe, transactional_tables, ignore;
public:
multi_update(THD *thd_arg, TABLE_LIST *ut, TABLE_LIST *leaves_list,
List<Item> *fields, List<Item> *values,
enum_duplicates handle_duplicates, bool ignore);
~multi_update();
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_data(List<Item> &items);
bool initialize_tables (JOIN *join);
void send_error(uint errcode,const char *err);
int do_updates (bool from_send_error);
bool send_eof();
};
class my_var : public Sql_alloc {
public:
LEX_STRING s;
bool local;
uint offset;
enum_field_types type;
my_var (LEX_STRING& j, bool i, uint o, enum_field_types t)
:s(j), local(i), offset(o), type(t)
{}
~my_var() {}
};
class select_dumpvar :public select_result_interceptor {
ha_rows row_count;
public:
List<my_var> var_list;
List<Item_func_set_user_var> vars;
List<Item_splocal> local_vars;
select_dumpvar(void) { var_list.empty(); local_vars.empty(); vars.empty(); row_count=0;}
~select_dumpvar() {}
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_data(List<Item> &items);
bool send_eof();
void cleanup();
};
/* Functions in sql_class.cc */
void add_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var);
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