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622b6a1275a0e204d82663322bc454e5879ae142
mariadb/libmysql/libmysql.c
holyfoot@deer.(none) e8697cf428 Big patch to make embedded-server working in 5.x 
Now it supports queries returning several results
(particularly important with the SP)
2006-01-04 14:20:28 +04:00

5168 lines
141 KiB
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/* Copyright (C) 2000-2004 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.
There are special exceptions to the terms and conditions of the GPL as it
is applied to this software. View the full text of the exception in file
EXCEPTIONS-CLIENT in the directory of this software distribution.
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 */
#include <my_global.h>
#include <my_sys.h>
#include <my_time.h>
#include <mysys_err.h>
#include <m_string.h>
#include <m_ctype.h>
#include "mysql.h"
#include "mysql_version.h"
#include "mysqld_error.h"
#include "errmsg.h"
#include <violite.h>
#include <sys/stat.h>
#include <signal.h>
#include <time.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#if !defined(MSDOS) && !defined(__WIN__)
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#ifdef HAVE_SELECT_H
#include <select.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#endif /* !defined(MSDOS) && !defined(__WIN__) */
#ifdef HAVE_POLL
#include <sys/poll.h>
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#if defined(THREAD) && !defined(__WIN__)
#include <my_pthread.h> /* because of signal() */
#endif
#ifndef INADDR_NONE
#define INADDR_NONE -1
#endif
#include <sql_common.h>
#include "client_settings.h"
#undef net_buffer_length
#undef max_allowed_packet
ulong net_buffer_length=8192;
ulong max_allowed_packet= 1024L*1024L*1024L;
ulong net_read_timeout= CLIENT_NET_READ_TIMEOUT;
ulong net_write_timeout= CLIENT_NET_WRITE_TIMEOUT;
#ifdef EMBEDDED_LIBRARY
#undef net_flush
my_bool net_flush(NET *net);
#endif
#if defined(MSDOS) || defined(__WIN__)
/* socket_errno is defined in my_global.h for all platforms */
#define perror(A)
#else
#include <errno.h>
#define SOCKET_ERROR -1
#endif /* __WIN__ */
/*
If allowed through some configuration, then this needs to
be changed
*/
#define MAX_LONG_DATA_LENGTH 8192
#define unsigned_field(A) ((A)->flags & UNSIGNED_FLAG)
static void append_wild(char *to,char *end,const char *wild);
sig_handler my_pipe_sig_handler(int sig);
static my_bool mysql_client_init= 0;
static my_bool org_my_init_done= 0;
/*
Initialize the MySQL client library
SYNOPSIS
mysql_server_init()
NOTES
Should be called before doing any other calls to the MySQL
client library to initialize thread specific variables etc.
It's called by mysql_init() to ensure that things will work for
old not threaded applications that doesn't call mysql_server_init()
directly.
RETURN
0 ok
1 could not initialize environment (out of memory or thread keys)
*/
int STDCALL mysql_server_init(int argc __attribute__((unused)),
char **argv __attribute__((unused)),
char **groups __attribute__((unused)))
{
int result= 0;
if (!mysql_client_init)
{
mysql_client_init=1;
org_my_init_done=my_init_done;
if (my_init()) /* Will init threads */
return 1;
init_client_errs();
if (!mysql_port)
{
mysql_port = MYSQL_PORT;
#ifndef MSDOS
{
struct servent *serv_ptr;
char *env;
if ((serv_ptr = getservbyname("mysql", "tcp")))
mysql_port = (uint) ntohs((ushort) serv_ptr->s_port);
if ((env = getenv("MYSQL_TCP_PORT")))
mysql_port =(uint) atoi(env);
}
#endif
}
if (!mysql_unix_port)
{
char *env;
#ifdef __WIN__
mysql_unix_port = (char*) MYSQL_NAMEDPIPE;
#else
mysql_unix_port = (char*) MYSQL_UNIX_ADDR;
#endif
if ((env = getenv("MYSQL_UNIX_PORT")))
mysql_unix_port = env;
}
mysql_debug(NullS);
#if defined(SIGPIPE) && !defined(__WIN__) && !defined(__NETWARE__)
(void) signal(SIGPIPE, SIG_IGN);
#endif
#ifdef EMBEDDED_LIBRARY
if (argc > -1)
result= init_embedded_server(argc, argv, groups);
#endif
}
#ifdef THREAD
else
result= (int)my_thread_init(); /* Init if new thread */
#endif
return result;
}
void STDCALL mysql_server_end()
{
#ifdef EMBEDDED_LIBRARY
end_embedded_server();
#endif
/* If library called my_init(), free memory allocated by it */
if (!org_my_init_done)
{
my_end(0);
#ifndef THREAD
/* Remove TRACING, if enabled by mysql_debug() */
DBUG_POP();
#endif
}
else
mysql_thread_end();
finish_client_errs();
free_charsets();
mysql_client_init= org_my_init_done= 0;
#ifdef EMBEDDED_SERVER
if (stderror_file)
{
fclose(stderror_file);
stderror_file= 0;
}
#endif
}
static MYSQL_PARAMETERS mysql_internal_parameters=
{&max_allowed_packet, &net_buffer_length};
MYSQL_PARAMETERS *STDCALL mysql_get_parameters(void)
{
return &mysql_internal_parameters;
}
my_bool STDCALL mysql_thread_init()
{
#ifdef THREAD
return my_thread_init();
#else
return 0;
#endif
}
void STDCALL mysql_thread_end()
{
#ifdef THREAD
my_thread_end();
#endif
}
/*
Let the user specify that we don't want SIGPIPE; This doesn't however work
with threaded applications as we can have multiple read in progress.
*/
static MYSQL* spawn_init(MYSQL* parent, const char* host,
unsigned int port,
const char* user,
const char* passwd);
/*
Expand wildcard to a sql string
*/
static void
append_wild(char *to, char *end, const char *wild)
{
end-=5; /* Some extra */
if (wild && wild[0])
{
to=strmov(to," like '");
while (*wild && to < end)
{
if (*wild == '\\' || *wild == '\'')
*to++='\\';
*to++= *wild++;
}
if (*wild) /* Too small buffer */
*to++='%'; /* Nicer this way */
to[0]='\'';
to[1]=0;
}
}
/**************************************************************************
Init debugging if MYSQL_DEBUG environment variable is found
**************************************************************************/
void STDCALL
mysql_debug(const char *debug __attribute__((unused)))
{
#ifndef DBUG_OFF
char *env;
if (_db_on_)
return; /* Already using debugging */
if (debug)
{
DEBUGGER_ON;
DBUG_PUSH(debug);
}
else if ((env = getenv("MYSQL_DEBUG")))
{
DEBUGGER_ON;
DBUG_PUSH(env);
#if !defined(_WINVER) && !defined(WINVER)
puts("\n-------------------------------------------------------");
puts("MYSQL_DEBUG found. libmysql started with the following:");
puts(env);
puts("-------------------------------------------------------\n");
#else
{
char buff[80];
buff[sizeof(buff)-1]= 0;
strxnmov(buff,sizeof(buff)-1,"libmysql: ", env, NullS);
MessageBox((HWND) 0,"Debugging variable MYSQL_DEBUG used",buff,MB_OK);
}
#endif
}
#endif
}
/**************************************************************************
Close the server connection if we get a SIGPIPE
ARGSUSED
**************************************************************************/
sig_handler
my_pipe_sig_handler(int sig __attribute__((unused)))
{
DBUG_PRINT("info",("Hit by signal %d",sig));
#ifdef DONT_REMEMBER_SIGNAL
(void) signal(SIGPIPE, my_pipe_sig_handler);
#endif
}
/* perform query on master */
my_bool STDCALL mysql_master_query(MYSQL *mysql, const char *q,
unsigned long length)
{
DBUG_ENTER("mysql_master_query");
if (mysql_master_send_query(mysql, q, length))
DBUG_RETURN(1);
DBUG_RETURN((*mysql->methods->read_query_result)(mysql));
}
my_bool STDCALL mysql_master_send_query(MYSQL *mysql, const char *q,
unsigned long length)
{
MYSQL *master = mysql->master;
DBUG_ENTER("mysql_master_send_query");
if (!master->net.vio && !mysql_real_connect(master,0,0,0,0,0,0,0))
DBUG_RETURN(1);
master->reconnect= 1;
mysql->last_used_con = master;
DBUG_RETURN(simple_command(master, COM_QUERY, q, length, 1));
}
/* perform query on slave */
my_bool STDCALL mysql_slave_query(MYSQL *mysql, const char *q,
unsigned long length)
{
DBUG_ENTER("mysql_slave_query");
if (mysql_slave_send_query(mysql, q, length))
DBUG_RETURN(1);
DBUG_RETURN((*mysql->methods->read_query_result)(mysql));
}
my_bool STDCALL mysql_slave_send_query(MYSQL *mysql, const char *q,
unsigned long length)
{
MYSQL* last_used_slave, *slave_to_use = 0;
DBUG_ENTER("mysql_slave_send_query");
if ((last_used_slave = mysql->last_used_slave))
slave_to_use = last_used_slave->next_slave;
else
slave_to_use = mysql->next_slave;
/*
Next_slave is always safe to use - we have a circular list of slaves
if there are no slaves, mysql->next_slave == mysql
*/
mysql->last_used_con = mysql->last_used_slave = slave_to_use;
if (!slave_to_use->net.vio && !mysql_real_connect(slave_to_use, 0,0,0,
0,0,0,0))
DBUG_RETURN(1);
slave_to_use->reconnect= 1;
DBUG_RETURN(simple_command(slave_to_use, COM_QUERY, q, length, 1));
}
/* enable/disable parsing of all queries to decide
if they go on master or slave */
void STDCALL mysql_enable_rpl_parse(MYSQL* mysql)
{
mysql->options.rpl_parse = 1;
}
void STDCALL mysql_disable_rpl_parse(MYSQL* mysql)
{
mysql->options.rpl_parse = 0;
}
/* get the value of the parse flag */
int STDCALL mysql_rpl_parse_enabled(MYSQL* mysql)
{
return mysql->options.rpl_parse;
}
/* enable/disable reads from master */
void STDCALL mysql_enable_reads_from_master(MYSQL* mysql)
{
mysql->options.no_master_reads = 0;
}
void STDCALL mysql_disable_reads_from_master(MYSQL* mysql)
{
mysql->options.no_master_reads = 1;
}
/* get the value of the master read flag */
my_bool STDCALL mysql_reads_from_master_enabled(MYSQL* mysql)
{
return !(mysql->options.no_master_reads);
}
/*
We may get an error while doing replication internals.
In this case, we add a special explanation to the original
error
*/
static void expand_error(MYSQL* mysql, int error)
{
char tmp[MYSQL_ERRMSG_SIZE];
char *p;
uint err_length;
strmake(tmp, mysql->net.last_error, MYSQL_ERRMSG_SIZE-1);
p = strmake(mysql->net.last_error, ER(error), MYSQL_ERRMSG_SIZE-1);
err_length= (uint) (p - mysql->net.last_error);
strmake(p, tmp, MYSQL_ERRMSG_SIZE-1 - err_length);
mysql->net.last_errno = error;
}
/*
This function assumes we have just called SHOW SLAVE STATUS and have
read the given result and row
*/
static my_bool get_master(MYSQL* mysql, MYSQL_RES* res, MYSQL_ROW row)
{
MYSQL* master;
DBUG_ENTER("get_master");
if (mysql_num_fields(res) < 3)
DBUG_RETURN(1); /* safety */
/* use the same username and password as the original connection */
if (!(master = spawn_init(mysql, row[0], atoi(row[2]), 0, 0)))
DBUG_RETURN(1);
mysql->master = master;
DBUG_RETURN(0);
}
/*
Assuming we already know that mysql points to a master connection,
retrieve all the slaves
*/
static my_bool get_slaves_from_master(MYSQL* mysql)
{
MYSQL_RES* res = 0;
MYSQL_ROW row;
my_bool error = 1;
int has_auth_info;
int port_ind;
DBUG_ENTER("get_slaves_from_master");
if (!mysql->net.vio && !mysql_real_connect(mysql,0,0,0,0,0,0,0))
{
expand_error(mysql, CR_PROBE_MASTER_CONNECT);
DBUG_RETURN(1);
}
mysql->reconnect= 1;
if (mysql_query(mysql, "SHOW SLAVE HOSTS") ||
!(res = mysql_store_result(mysql)))
{
expand_error(mysql, CR_PROBE_SLAVE_HOSTS);
DBUG_RETURN(1);
}
switch (mysql_num_fields(res)) {
case 5:
has_auth_info = 0;
port_ind=2;
break;
case 7:
has_auth_info = 1;
port_ind=4;
break;
default:
goto err;
}
while ((row = mysql_fetch_row(res)))
{
MYSQL* slave;
const char* tmp_user, *tmp_pass;
if (has_auth_info)
{
tmp_user = row[2];
tmp_pass = row[3];
}
else
{
tmp_user = mysql->user;
tmp_pass = mysql->passwd;
}
if (!(slave = spawn_init(mysql, row[1], atoi(row[port_ind]),
tmp_user, tmp_pass)))
goto err;
/* Now add slave into the circular linked list */
slave->next_slave = mysql->next_slave;
mysql->next_slave = slave;
}
error = 0;
err:
if (res)
mysql_free_result(res);
DBUG_RETURN(error);
}
my_bool STDCALL mysql_rpl_probe(MYSQL* mysql)
{
MYSQL_RES *res= 0;
MYSQL_ROW row;
my_bool error= 1;
DBUG_ENTER("mysql_rpl_probe");
/*
First determine the replication role of the server we connected to
the most reliable way to do this is to run SHOW SLAVE STATUS and see
if we have a non-empty master host. This is still not fool-proof -
it is not a sin to have a master that has a dormant slave thread with
a non-empty master host. However, it is more reliable to check
for empty master than whether the slave thread is actually running
*/
if (mysql_query(mysql, "SHOW SLAVE STATUS") ||
!(res = mysql_store_result(mysql)))
{
expand_error(mysql, CR_PROBE_SLAVE_STATUS);
DBUG_RETURN(1);
}
row= mysql_fetch_row(res);
/*
Check master host for emptiness/NULL
For MySQL 4.0 it's enough to check for row[0]
*/
if (row && row[0] && *(row[0]))
{
/* this is a slave, ask it for the master */
if (get_master(mysql, res, row) || get_slaves_from_master(mysql))
goto err;
}
else
{
mysql->master = mysql;
if (get_slaves_from_master(mysql))
goto err;
}
error = 0;
err:
if (res)
mysql_free_result(res);
DBUG_RETURN(error);
}
/*
Make a not so fool-proof decision on where the query should go, to
the master or the slave. Ideally the user should always make this
decision himself with mysql_master_query() or mysql_slave_query().
However, to be able to more easily port the old code, we support the
option of an educated guess - this should work for most applications,
however, it may make the wrong decision in some particular cases. If
that happens, the user would have to change the code to call
mysql_master_query() or mysql_slave_query() explicitly in the place
where we have made the wrong decision
*/
enum mysql_rpl_type
STDCALL mysql_rpl_query_type(const char* q, int len)
{
const char *q_end= q + len;
for (; q < q_end; ++q)
{
char c;
if (my_isalpha(&my_charset_latin1, (c= *q)))
{
switch (my_tolower(&my_charset_latin1,c)) {
case 'i': /* insert */
case 'u': /* update or unlock tables */
case 'l': /* lock tables or load data infile */
case 'd': /* drop or delete */
case 'a': /* alter */
return MYSQL_RPL_MASTER;
case 'c': /* create or check */
return my_tolower(&my_charset_latin1,q[1]) == 'h' ? MYSQL_RPL_ADMIN :
MYSQL_RPL_MASTER;
case 's': /* select or show */
return my_tolower(&my_charset_latin1,q[1]) == 'h' ? MYSQL_RPL_ADMIN :
MYSQL_RPL_SLAVE;
case 'f': /* flush */
case 'r': /* repair */
case 'g': /* grant */
return MYSQL_RPL_ADMIN;
default:
return MYSQL_RPL_SLAVE;
}
}
}
return MYSQL_RPL_MASTER; /* By default, send to master */
}
/**************************************************************************
Connect to sql server
If host == 0 then use localhost
**************************************************************************/
#ifdef USE_OLD_FUNCTIONS
MYSQL * STDCALL
mysql_connect(MYSQL *mysql,const char *host,
const char *user, const char *passwd)
{
MYSQL *res;
mysql=mysql_init(mysql); /* Make it thread safe */
{
DBUG_ENTER("mysql_connect");
if (!(res=mysql_real_connect(mysql,host,user,passwd,NullS,0,NullS,0)))
{
if (mysql->free_me)
my_free((gptr) mysql,MYF(0));
}
mysql->reconnect= 1;
DBUG_RETURN(res);
}
}
#endif
/**************************************************************************
Change user and database
**************************************************************************/
int cli_read_change_user_result(MYSQL *mysql, char *buff, const char *passwd)
{
NET *net= &mysql->net;
ulong pkt_length;
pkt_length= net_safe_read(mysql);
if (pkt_length == packet_error)
return 1;
if (pkt_length == 1 && net->read_pos[0] == 254 &&
mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
{
/*
By sending this very specific reply server asks us to send scrambled
password in old format. The reply contains scramble_323.
*/
scramble_323(buff, mysql->scramble, passwd);
if (my_net_write(net, buff, SCRAMBLE_LENGTH_323 + 1) || net_flush(net))
{
net->last_errno= CR_SERVER_LOST;
strmov(net->sqlstate, unknown_sqlstate);
strmov(net->last_error,ER(net->last_errno));
return 1;
}
/* Read what server thinks about out new auth message report */
if (net_safe_read(mysql) == packet_error)
return 1;
}
return 0;
}
my_bool STDCALL mysql_change_user(MYSQL *mysql, const char *user,
const char *passwd, const char *db)
{
char buff[512],*end=buff;
int rc;
DBUG_ENTER("mysql_change_user");
if (!user)
user="";
if (!passwd)
passwd="";
/* Store user into the buffer */
end=strmov(end,user)+1;
/* write scrambled password according to server capabilities */
if (passwd[0])
{
if (mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
{
*end++= SCRAMBLE_LENGTH;
scramble(end, mysql->scramble, passwd);
end+= SCRAMBLE_LENGTH;
}
else
{
scramble_323(end, mysql->scramble, passwd);
end+= SCRAMBLE_LENGTH_323 + 1;
}
}
else
*end++= '\0'; /* empty password */
/* Add database if needed */
end= strmov(end, db ? db : "") + 1;
/* Write authentication package */
simple_command(mysql,COM_CHANGE_USER, buff,(ulong) (end-buff),1);
rc= (*mysql->methods->read_change_user_result)(mysql, buff, passwd);
/*
The server will close all statements no matter was the attempt
to change user successful or not.
*/
mysql_detach_stmt_list(&mysql->stmts);
if (rc == 0)
{
/* Free old connect information */
my_free(mysql->user,MYF(MY_ALLOW_ZERO_PTR));
my_free(mysql->passwd,MYF(MY_ALLOW_ZERO_PTR));
my_free(mysql->db,MYF(MY_ALLOW_ZERO_PTR));
/* alloc new connect information */
mysql->user= my_strdup(user,MYF(MY_WME));
mysql->passwd=my_strdup(passwd,MYF(MY_WME));
mysql->db= db ? my_strdup(db,MYF(MY_WME)) : 0;
}
DBUG_RETURN(rc);
}
#if defined(HAVE_GETPWUID) && defined(NO_GETPWUID_DECL)
struct passwd *getpwuid(uid_t);
char* getlogin(void);
#endif
#if defined(__NETWARE__)
/* Default to value of USER on NetWare, if unset use "UNKNOWN_USER" */
void read_user_name(char *name)
{
char *str=getenv("USER");
strmake(name, str ? str : "UNKNOWN_USER", USERNAME_LENGTH);
}
#elif !defined(MSDOS) && ! defined(VMS) && !defined(__WIN__) && !defined(OS2)
void read_user_name(char *name)
{
DBUG_ENTER("read_user_name");
if (geteuid() == 0)
(void) strmov(name,"root"); /* allow use of surun */
else
{
#ifdef HAVE_GETPWUID
struct passwd *skr;
const char *str;
if ((str=getlogin()) == NULL)
{
if ((skr=getpwuid(geteuid())) != NULL)
str=skr->pw_name;
else if (!(str=getenv("USER")) && !(str=getenv("LOGNAME")) &&
!(str=getenv("LOGIN")))
str="UNKNOWN_USER";
}
(void) strmake(name,str,USERNAME_LENGTH);
#elif HAVE_CUSERID
(void) cuserid(name);
#else
strmov(name,"UNKNOWN_USER");
#endif
}
DBUG_VOID_RETURN;
}
#else /* If MSDOS || VMS */
void read_user_name(char *name)
{
char *str=getenv("USER"); /* ODBC will send user variable */
strmake(name,str ? str : "ODBC", USERNAME_LENGTH);
}
#endif
my_bool handle_local_infile(MYSQL *mysql, const char *net_filename)
{
my_bool result= 1;
uint packet_length=MY_ALIGN(mysql->net.max_packet-16,IO_SIZE);
NET *net= &mysql->net;
int readcount;
void *li_ptr; /* pass state to local_infile functions */
char *buf; /* buffer to be filled by local_infile_read */
struct st_mysql_options *options= &mysql->options;
DBUG_ENTER("handle_local_infile");
/* check that we've got valid callback functions */
if (!(options->local_infile_init &&
options->local_infile_read &&
options->local_infile_end &&
options->local_infile_error))
{
/* if any of the functions is invalid, set the default */
mysql_set_local_infile_default(mysql);
}
/* copy filename into local memory and allocate read buffer */
if (!(buf=my_malloc(packet_length, MYF(0))))
{
strmov(net->sqlstate, unknown_sqlstate);
strmov(net->last_error, ER(net->last_errno=CR_OUT_OF_MEMORY));
DBUG_RETURN(1);
}
/* initialize local infile (open file, usually) */
if ((*options->local_infile_init)(&li_ptr, net_filename,
options->local_infile_userdata))
{
my_net_write(net,"",0); /* Server needs one packet */
net_flush(net);
strmov(net->sqlstate, unknown_sqlstate);
net->last_errno= (*options->local_infile_error)(li_ptr,
net->last_error,
sizeof(net->last_error)-1);
goto err;
}
/* read blocks of data from local infile callback */
while ((readcount =
(*options->local_infile_read)(li_ptr, buf,
packet_length)) > 0)
{
if (my_net_write(net,buf,readcount))
{
DBUG_PRINT("error",
("Lost connection to MySQL server during LOAD DATA of local file"));
strmov(net->sqlstate, unknown_sqlstate);
net->last_errno=CR_SERVER_LOST;
strmov(net->last_error,ER(net->last_errno));
goto err;
}
}
/* Send empty packet to mark end of file */
if (my_net_write(net,"",0) || net_flush(net))
{
strmov(net->sqlstate, unknown_sqlstate);
net->last_errno=CR_SERVER_LOST;
sprintf(net->last_error,ER(net->last_errno),errno);
goto err;
}
if (readcount < 0)
{
net->last_errno= (*options->local_infile_error)(li_ptr,
net->last_error,
sizeof(net->last_error)-1);
goto err;
}
result=0; /* Ok */
err:
/* free up memory allocated with _init, usually */
(*options->local_infile_end)(li_ptr);
my_free(buf, MYF(0));
DBUG_RETURN(result);
}
/****************************************************************************
Default handlers for LOAD LOCAL INFILE
****************************************************************************/
typedef struct st_default_local_infile
{
int fd;
int error_num;
const char *filename;
char error_msg[LOCAL_INFILE_ERROR_LEN];
} default_local_infile_data;
/*
Open file for LOAD LOCAL INFILE
SYNOPSIS
default_local_infile_init()
ptr Store pointer to internal data here
filename File name to open. This may be in unix format !
NOTES
Even if this function returns an error, the load data interface
guarantees that default_local_infile_end() is called.
RETURN
0 ok
1 error
*/
static int default_local_infile_init(void **ptr, const char *filename,
void *userdata __attribute__ ((unused)))
{
default_local_infile_data *data;
char tmp_name[FN_REFLEN];
if (!(*ptr= data= ((default_local_infile_data *)
my_malloc(sizeof(default_local_infile_data), MYF(0)))))
return 1; /* out of memory */
data->error_msg[0]= 0;
data->error_num= 0;
data->filename= filename;
fn_format(tmp_name, filename, "", "", MY_UNPACK_FILENAME);
if ((data->fd = my_open(tmp_name, O_RDONLY, MYF(0))) < 0)
{
data->error_num= my_errno;
my_snprintf(data->error_msg, sizeof(data->error_msg)-1,
EE(EE_FILENOTFOUND), tmp_name, data->error_num);
return 1;
}
return 0; /* ok */
}
/*
Read data for LOAD LOCAL INFILE
SYNOPSIS
default_local_infile_read()
ptr Points to handle allocated by _init
buf Read data here
buf_len Ammount of data to read
RETURN
> 0 number of bytes read
== 0 End of data
< 0 Error
*/
static int default_local_infile_read(void *ptr, char *buf, uint buf_len)
{
int count;
default_local_infile_data*data = (default_local_infile_data *) ptr;
if ((count= (int) my_read(data->fd, (byte *) buf, buf_len, MYF(0))) < 0)
{
data->error_num= EE_READ; /* the errmsg for not entire file read */
my_snprintf(data->error_msg, sizeof(data->error_msg)-1,
EE(EE_READ),
data->filename, my_errno);
}
return count;
}
/*
Read data for LOAD LOCAL INFILE
SYNOPSIS
default_local_infile_end()
ptr Points to handle allocated by _init
May be NULL if _init failed!
RETURN
*/
static void default_local_infile_end(void *ptr)
{
default_local_infile_data *data= (default_local_infile_data *) ptr;
if (data) /* If not error on open */
{
if (data->fd >= 0)
my_close(data->fd, MYF(MY_WME));
my_free(ptr, MYF(MY_WME));
}
}
/*
Return error from LOAD LOCAL INFILE
SYNOPSIS
default_local_infile_end()
ptr Points to handle allocated by _init
May be NULL if _init failed!
error_msg Store error text here
error_msg_len Max lenght of error_msg
RETURN
error message number
*/
static int
default_local_infile_error(void *ptr, char *error_msg, uint error_msg_len)
{
default_local_infile_data *data = (default_local_infile_data *) ptr;
if (data) /* If not error on open */
{
strmake(error_msg, data->error_msg, error_msg_len);
return data->error_num;
}
/* This can only happen if we got error on malloc of handle */
strmov(error_msg, ER(CR_OUT_OF_MEMORY));
return CR_OUT_OF_MEMORY;
}
void
mysql_set_local_infile_handler(MYSQL *mysql,
int (*local_infile_init)(void **, const char *,
void *),
int (*local_infile_read)(void *, char *, uint),
void (*local_infile_end)(void *),
int (*local_infile_error)(void *, char *, uint),
void *userdata)
{
mysql->options.local_infile_init= local_infile_init;
mysql->options.local_infile_read= local_infile_read;
mysql->options.local_infile_end= local_infile_end;
mysql->options.local_infile_error= local_infile_error;
mysql->options.local_infile_userdata = userdata;
}
void mysql_set_local_infile_default(MYSQL *mysql)
{
mysql->options.local_infile_init= default_local_infile_init;
mysql->options.local_infile_read= default_local_infile_read;
mysql->options.local_infile_end= default_local_infile_end;
mysql->options.local_infile_error= default_local_infile_error;
}
/**************************************************************************
Do a query. If query returned rows, free old rows.
Read data by mysql_store_result or by repeat call of mysql_fetch_row
**************************************************************************/
int STDCALL
mysql_query(MYSQL *mysql, const char *query)
{
return mysql_real_query(mysql,query, (uint) strlen(query));
}
static MYSQL* spawn_init(MYSQL* parent, const char* host,
unsigned int port, const char* user,
const char* passwd)
{
MYSQL* child;
DBUG_ENTER("spawn_init");
if (!(child= mysql_init(0)))
DBUG_RETURN(0);
child->options.user= my_strdup((user) ? user :
(parent->user ? parent->user :
parent->options.user), MYF(0));
child->options.password= my_strdup((passwd) ? passwd :
(parent->passwd ?
parent->passwd :
parent->options.password), MYF(0));
child->options.port= port;
child->options.host= my_strdup((host) ? host :
(parent->host ?
parent->host :
parent->options.host), MYF(0));
if (parent->db)
child->options.db= my_strdup(parent->db, MYF(0));
else if (parent->options.db)
child->options.db= my_strdup(parent->options.db, MYF(0));
/*
rpl_pivot is set to 1 in mysql_init(); Reset it as we are not doing
replication here
*/
child->rpl_pivot= 0;
DBUG_RETURN(child);
}
int
STDCALL mysql_set_master(MYSQL* mysql, const char* host,
unsigned int port, const char* user,
const char* passwd)
{
if (mysql->master != mysql && !mysql->master->rpl_pivot)
mysql_close(mysql->master);
if (!(mysql->master = spawn_init(mysql, host, port, user, passwd)))
return 1;
return 0;
}
int
STDCALL mysql_add_slave(MYSQL* mysql, const char* host,
unsigned int port,
const char* user,
const char* passwd)
{
MYSQL* slave;
if (!(slave = spawn_init(mysql, host, port, user, passwd)))
return 1;
slave->next_slave = mysql->next_slave;
mysql->next_slave = slave;
return 0;
}
/**************************************************************************
Return next field of the query results
**************************************************************************/
MYSQL_FIELD * STDCALL
mysql_fetch_field(MYSQL_RES *result)
{
if (result->current_field >= result->field_count)
return(NULL);
return &result->fields[result->current_field++];
}
/**************************************************************************
Move to a specific row and column
**************************************************************************/
void STDCALL
mysql_data_seek(MYSQL_RES *result, my_ulonglong row)
{
MYSQL_ROWS *tmp=0;
DBUG_PRINT("info",("mysql_data_seek(%ld)",(long) row));
if (result->data)
for (tmp=result->data->data; row-- && tmp ; tmp = tmp->next) ;
result->current_row=0;
result->data_cursor = tmp;
}
/*************************************************************************
put the row or field cursor one a position one got from mysql_row_tell()
This doesn't restore any data. The next mysql_fetch_row or
mysql_fetch_field will return the next row or field after the last used
*************************************************************************/
MYSQL_ROW_OFFSET STDCALL
mysql_row_seek(MYSQL_RES *result, MYSQL_ROW_OFFSET row)
{
MYSQL_ROW_OFFSET return_value=result->data_cursor;
result->current_row= 0;
result->data_cursor= row;
return return_value;
}
MYSQL_FIELD_OFFSET STDCALL
mysql_field_seek(MYSQL_RES *result, MYSQL_FIELD_OFFSET field_offset)
{
MYSQL_FIELD_OFFSET return_value=result->current_field;
result->current_field=field_offset;
return return_value;
}
/*****************************************************************************
List all databases
*****************************************************************************/
MYSQL_RES * STDCALL
mysql_list_dbs(MYSQL *mysql, const char *wild)
{
char buff[255];
DBUG_ENTER("mysql_list_dbs");
append_wild(strmov(buff,"show databases"),buff+sizeof(buff),wild);
if (mysql_query(mysql,buff))
DBUG_RETURN(0);
DBUG_RETURN (mysql_store_result(mysql));
}
/*****************************************************************************
List all tables in a database
If wild is given then only the tables matching wild is returned
*****************************************************************************/
MYSQL_RES * STDCALL
mysql_list_tables(MYSQL *mysql, const char *wild)
{
char buff[255];
DBUG_ENTER("mysql_list_tables");
append_wild(strmov(buff,"show tables"),buff+sizeof(buff),wild);
if (mysql_query(mysql,buff))
DBUG_RETURN(0);
DBUG_RETURN (mysql_store_result(mysql));
}
MYSQL_FIELD *cli_list_fields(MYSQL *mysql)
{
MYSQL_DATA *query;
if (!(query= cli_read_rows(mysql,(MYSQL_FIELD*) 0,
protocol_41(mysql) ? 8 : 6)))
return NULL;
mysql->field_count= (uint) query->rows;
return unpack_fields(query,&mysql->field_alloc,
mysql->field_count, 1, mysql->server_capabilities);
}
/**************************************************************************
List all fields in a table
If wild is given then only the fields matching wild is returned
Instead of this use query:
show fields in 'table' like "wild"
**************************************************************************/
MYSQL_RES * STDCALL
mysql_list_fields(MYSQL *mysql, const char *table, const char *wild)
{
MYSQL_RES *result;
MYSQL_FIELD *fields;
char buff[257],*end;
DBUG_ENTER("mysql_list_fields");
DBUG_PRINT("enter",("table: '%s' wild: '%s'",table,wild ? wild : ""));
end=strmake(strmake(buff, table,128)+1,wild ? wild : "",128);
free_old_query(mysql);
if (simple_command(mysql,COM_FIELD_LIST,buff,(ulong) (end-buff),1) ||
!(fields= (*mysql->methods->list_fields)(mysql)))
DBUG_RETURN(NULL);
if (!(result = (MYSQL_RES *) my_malloc(sizeof(MYSQL_RES),
MYF(MY_WME | MY_ZEROFILL))))
DBUG_RETURN(NULL);
result->methods= mysql->methods;
result->field_alloc=mysql->field_alloc;
mysql->fields=0;
result->field_count = mysql->field_count;
result->fields= fields;
result->eof=1;
DBUG_RETURN(result);
}
/* List all running processes (threads) in server */
MYSQL_RES * STDCALL
mysql_list_processes(MYSQL *mysql)
{
MYSQL_DATA *fields;
uint field_count;
uchar *pos;
DBUG_ENTER("mysql_list_processes");
LINT_INIT(fields);
if (simple_command(mysql,COM_PROCESS_INFO,0,0,0))
DBUG_RETURN(0);
free_old_query(mysql);
pos=(uchar*) mysql->net.read_pos;
field_count=(uint) net_field_length(&pos);
if (!(fields = (*mysql->methods->read_rows)(mysql,(MYSQL_FIELD*) 0,
protocol_41(mysql) ? 7 : 5)))
DBUG_RETURN(NULL);
if (!(mysql->fields=unpack_fields(fields,&mysql->field_alloc,field_count,0,
mysql->server_capabilities)))
DBUG_RETURN(0);
mysql->status=MYSQL_STATUS_GET_RESULT;
mysql->field_count=field_count;
DBUG_RETURN(mysql_store_result(mysql));
}
#ifdef USE_OLD_FUNCTIONS
int STDCALL
mysql_create_db(MYSQL *mysql, const char *db)
{
DBUG_ENTER("mysql_createdb");
DBUG_PRINT("enter",("db: %s",db));
DBUG_RETURN(simple_command(mysql,COM_CREATE_DB,db, (ulong) strlen(db),0));
}
int STDCALL
mysql_drop_db(MYSQL *mysql, const char *db)
{
DBUG_ENTER("mysql_drop_db");
DBUG_PRINT("enter",("db: %s",db));
DBUG_RETURN(simple_command(mysql,COM_DROP_DB,db,(ulong) strlen(db),0));
}
#endif
int STDCALL
mysql_shutdown(MYSQL *mysql, enum mysql_enum_shutdown_level shutdown_level)
{
uchar level[1];
DBUG_ENTER("mysql_shutdown");
level[0]= (uchar) shutdown_level;
DBUG_RETURN(simple_command(mysql, COM_SHUTDOWN, (char *)level, 1, 0));
}
int STDCALL
mysql_refresh(MYSQL *mysql,uint options)
{
uchar bits[1];
DBUG_ENTER("mysql_refresh");
bits[0]= (uchar) options;
DBUG_RETURN(simple_command(mysql,COM_REFRESH,(char*) bits,1,0));
}
int STDCALL
mysql_kill(MYSQL *mysql,ulong pid)
{
char buff[4];
DBUG_ENTER("mysql_kill");
int4store(buff,pid);
DBUG_RETURN(simple_command(mysql,COM_PROCESS_KILL,buff,sizeof(buff),0));
}
int STDCALL
mysql_set_server_option(MYSQL *mysql, enum enum_mysql_set_option option)
{
char buff[2];
DBUG_ENTER("mysql_set_server_option");
int2store(buff, (uint) option);
DBUG_RETURN(simple_command(mysql, COM_SET_OPTION, buff, sizeof(buff), 0));
}
int STDCALL
mysql_dump_debug_info(MYSQL *mysql)
{
DBUG_ENTER("mysql_dump_debug_info");
DBUG_RETURN(simple_command(mysql,COM_DEBUG,0,0,0));
}
const char *cli_read_statistics(MYSQL *mysql)
{
mysql->net.read_pos[mysql->packet_length]=0; /* End of stat string */
if (!mysql->net.read_pos[0])
{
strmov(mysql->net.sqlstate, unknown_sqlstate);
mysql->net.last_errno=CR_WRONG_HOST_INFO;
strmov(mysql->net.last_error, ER(mysql->net.last_errno));
return mysql->net.last_error;
}
return (char*) mysql->net.read_pos;
}
const char * STDCALL
mysql_stat(MYSQL *mysql)
{
DBUG_ENTER("mysql_stat");
if (simple_command(mysql,COM_STATISTICS,0,0,0))
return mysql->net.last_error;
DBUG_RETURN((*mysql->methods->read_statistics)(mysql));
}
int STDCALL
mysql_ping(MYSQL *mysql)
{
DBUG_ENTER("mysql_ping");
DBUG_RETURN(simple_command(mysql,COM_PING,0,0,0));
}
const char * STDCALL
mysql_get_server_info(MYSQL *mysql)
{
return((char*) mysql->server_version);
}
/*
Get version number for server in a form easy to test on
SYNOPSIS
mysql_get_server_version()
mysql Connection
EXAMPLE
4.1.0-alfa -> 40100
NOTES
We will ensure that a newer server always has a bigger number.
RETURN
Signed number > 323000
*/
ulong STDCALL
mysql_get_server_version(MYSQL *mysql)
{
uint major, minor, version;
char *pos= mysql->server_version, *end_pos;
major= (uint) strtoul(pos, &end_pos, 10); pos=end_pos+1;
minor= (uint) strtoul(pos, &end_pos, 10); pos=end_pos+1;
version= (uint) strtoul(pos, &end_pos, 10);
return (ulong) major*10000L+(ulong) (minor*100+version);
}
const char * STDCALL
mysql_get_host_info(MYSQL *mysql)
{
return(mysql->host_info);
}
uint STDCALL
mysql_get_proto_info(MYSQL *mysql)
{
return (mysql->protocol_version);
}
const char * STDCALL
mysql_get_client_info(void)
{
return (char*) MYSQL_SERVER_VERSION;
}
ulong STDCALL mysql_get_client_version(void)
{
return MYSQL_VERSION_ID;
}
my_bool STDCALL mysql_eof(MYSQL_RES *res)
{
return res->eof;
}
MYSQL_FIELD * STDCALL mysql_fetch_field_direct(MYSQL_RES *res,uint fieldnr)
{
return &(res)->fields[fieldnr];
}
MYSQL_FIELD * STDCALL mysql_fetch_fields(MYSQL_RES *res)
{
return (res)->fields;
}
MYSQL_ROW_OFFSET STDCALL mysql_row_tell(MYSQL_RES *res)
{
return res->data_cursor;
}
MYSQL_FIELD_OFFSET STDCALL mysql_field_tell(MYSQL_RES *res)
{
return (res)->current_field;
}
/* MYSQL */
unsigned int STDCALL mysql_field_count(MYSQL *mysql)
{
return mysql->last_used_con->field_count;
}
my_ulonglong STDCALL mysql_affected_rows(MYSQL *mysql)
{
return mysql->last_used_con->affected_rows;
}
my_ulonglong STDCALL mysql_insert_id(MYSQL *mysql)
{
return mysql->last_used_con->insert_id;
}
const char *STDCALL mysql_sqlstate(MYSQL *mysql)
{
return mysql->net.sqlstate;
}
uint STDCALL mysql_warning_count(MYSQL *mysql)
{
return mysql->warning_count;
}
const char *STDCALL mysql_info(MYSQL *mysql)
{
return mysql->info;
}
ulong STDCALL mysql_thread_id(MYSQL *mysql)
{
return (mysql)->thread_id;
}
const char * STDCALL mysql_character_set_name(MYSQL *mysql)
{
return mysql->charset->csname;
}
void STDCALL mysql_get_character_set_info(MYSQL *mysql, MY_CHARSET_INFO *csinfo)
{
csinfo->number = mysql->charset->number;
csinfo->state = mysql->charset->state;
csinfo->csname = mysql->charset->csname;
csinfo->name = mysql->charset->name;
csinfo->comment = mysql->charset->comment;
csinfo->mbminlen = mysql->charset->mbminlen;
csinfo->mbmaxlen = mysql->charset->mbmaxlen;
if (mysql->options.charset_dir)
csinfo->dir = mysql->options.charset_dir;
else
csinfo->dir = charsets_dir;
}
uint STDCALL mysql_thread_safe(void)
{
#ifdef THREAD
return 1;
#else
return 0;
#endif
}
my_bool STDCALL mysql_embedded(void)
{
#ifdef EMBEDDED_LIBRARY
return 1;
#else
return 0;
#endif
}
/****************************************************************************
Some support functions
****************************************************************************/
/*
Functions called my my_net_init() to set some application specific variables
*/
void my_net_local_init(NET *net)
{
net->max_packet= (uint) net_buffer_length;
net->read_timeout= (uint) net_read_timeout;
net->write_timeout=(uint) net_write_timeout;
net->retry_count= 1;
net->max_packet_size= max(net_buffer_length, max_allowed_packet);
}
/*
This function is used to create HEX string that you
can use in a SQL statement in of the either ways:
INSERT INTO blob_column VALUES (0xAABBCC); (any MySQL version)
INSERT INTO blob_column VALUES (X'AABBCC'); (4.1 and higher)
The string in "from" is encoded to a HEX string.
The result is placed in "to" and a terminating null byte is appended.
The string pointed to by "from" must be "length" bytes long.
You must allocate the "to" buffer to be at least length*2+1 bytes long.
Each character needs two bytes, and you need room for the terminating
null byte. When mysql_hex_string() returns, the contents of "to" will
be a null-terminated string. The return value is the length of the
encoded string, not including the terminating null character.
The return value does not contain any leading 0x or a leading X' and
trailing '. The caller must supply whichever of those is desired.
*/
ulong STDCALL
mysql_hex_string(char *to, const char *from, ulong length)
{
char *to0= to;
const char *end;
for (end= from + length; from < end; from++)
{
*to++= _dig_vec_upper[((unsigned char) *from) >> 4];
*to++= _dig_vec_upper[((unsigned char) *from) & 0x0F];
}
*to= '\0';
return (ulong) (to-to0);
}
/*
Add escape characters to a string (blob?) to make it suitable for a insert
to should at least have place for length*2+1 chars
Returns the length of the to string
*/
ulong STDCALL
mysql_escape_string(char *to,const char *from,ulong length)
{
return escape_string_for_mysql(default_charset_info, to, 0, from, length);
}
ulong STDCALL
mysql_real_escape_string(MYSQL *mysql, char *to,const char *from,
ulong length)
{
if (mysql->server_status & SERVER_STATUS_NO_BACKSLASH_ESCAPES)
return escape_quotes_for_mysql(mysql->charset, to, 0, from, length);
return escape_string_for_mysql(mysql->charset, to, 0, from, length);
}
char * STDCALL
mysql_odbc_escape_string(MYSQL *mysql,
char *to, ulong to_length,
const char *from, ulong from_length,
void *param,
char * (*extend_buffer)
(void *, char *, ulong *))
{
char *to_end=to+to_length-5;
const char *end;
#ifdef USE_MB
my_bool use_mb_flag=use_mb(mysql->charset);
#endif
for (end=from+from_length; from != end ; from++)
{
if (to >= to_end)
{
to_length = (ulong) (end-from)+512; /* We want this much more */
if (!(to=(*extend_buffer)(param, to, &to_length)))
return to;
to_end=to+to_length-5;
}
#ifdef USE_MB
{
int l;
if (use_mb_flag && (l = my_ismbchar(mysql->charset, from, end)))
{
while (l--)
*to++ = *from++;
from--;
continue;
}
}
#endif
switch (*from) {
case 0: /* Must be escaped for 'mysql' */
*to++= '\\';
*to++= '0';
break;
case '\n': /* Must be escaped for logs */
*to++= '\\';
*to++= 'n';
break;
case '\r':
*to++= '\\';
*to++= 'r';
break;
case '\\':
*to++= '\\';
*to++= '\\';
break;
case '\'':
*to++= '\\';
*to++= '\'';
break;
case '"': /* Better safe than sorry */
*to++= '\\';
*to++= '"';
break;
case '\032': /* This gives problems on Win32 */
*to++= '\\';
*to++= 'Z';
break;
default:
*to++= *from;
}
}
return to;
}
void STDCALL
myodbc_remove_escape(MYSQL *mysql,char *name)
{
char *to;
#ifdef USE_MB
my_bool use_mb_flag=use_mb(mysql->charset);
char *end;
LINT_INIT(end);
if (use_mb_flag)
for (end=name; *end ; end++) ;
#endif
for (to=name ; *name ; name++)
{
#ifdef USE_MB
int l;
if (use_mb_flag && (l = my_ismbchar( mysql->charset, name , end ) ) )
{
while (l--)
*to++ = *name++;
name--;
continue;
}
#endif
if (*name == '\\' && name[1])
name++;
*to++= *name;
}
*to=0;
}
/********************************************************************
Implementation of new client API for 4.1 version.
mysql_stmt_* are real prototypes used by applications.
To make API work in embedded library all functions performing
real I/O are prefixed with 'cli_' (abbreviated from 'Call Level
Interface'). This functions are invoked via pointers set in
MYSQL::methods structure. Embedded counterparts, prefixed with
'emb_' reside in libmysqld/lib_sql.cc.
*********************************************************************/
/******************* Declarations ***********************************/
/* Default number of rows fetched per one COM_STMT_FETCH command. */
#define DEFAULT_PREFETCH_ROWS (ulong) 1
/*
These functions are called by function pointer MYSQL_STMT::read_row_func.
Each function corresponds to one of the read methods:
- mysql_stmt_fetch without prior mysql_stmt_store_result,
- mysql_stmt_fetch when result is stored,
- mysql_stmt_fetch when there are no rows (always returns MYSQL_NO_DATA)
*/
static int stmt_read_row_unbuffered(MYSQL_STMT *stmt, unsigned char **row);
static int stmt_read_row_buffered(MYSQL_STMT *stmt, unsigned char **row);
static int stmt_read_row_from_cursor(MYSQL_STMT *stmt, unsigned char **row);
static int stmt_read_row_no_data(MYSQL_STMT *stmt, unsigned char **row);
static int stmt_read_row_no_result_set(MYSQL_STMT *stmt, unsigned char **row);
/*
This function is used in mysql_stmt_store_result if
STMT_ATTR_UPDATE_MAX_LENGTH attribute is set.
*/
static void stmt_update_metadata(MYSQL_STMT *stmt, MYSQL_ROWS *data);
static my_bool setup_one_fetch_function(MYSQL_BIND *bind, MYSQL_FIELD *field);
/* Auxilary function used to reset statement handle. */
#define RESET_SERVER_SIDE 1
#define RESET_LONG_DATA 2
#define RESET_STORE_RESULT 4
static my_bool reset_stmt_handle(MYSQL_STMT *stmt, uint flags);
/*
Maximum sizes of MYSQL_TYPE_DATE, MYSQL_TYPE_TIME, MYSQL_TYPE_DATETIME
values stored in network buffer.
*/
/* 1 (length) + 2 (year) + 1 (month) + 1 (day) */
#define MAX_DATE_REP_LENGTH 5
/*
1 (length) + 1 (is negative) + 4 (day count) + 1 (hour)
+ 1 (minute) + 1 (seconds) + 4 (microseconds)
*/
#define MAX_TIME_REP_LENGTH 13
/*
1 (length) + 2 (year) + 1 (month) + 1 (day) +
1 (hour) + 1 (minute) + 1 (second) + 4 (microseconds)
*/
#define MAX_DATETIME_REP_LENGTH 12
#define MAX_DOUBLE_STRING_REP_LENGTH 331
/* A macro to check truncation errors */
#define IS_TRUNCATED(value, is_unsigned, min, max, umax) \
((is_unsigned) ? (((value) > (umax) || (value) < 0) ? 1 : 0) : \
(((value) > (max) || (value) < (min)) ? 1 : 0))
#define BIND_RESULT_DONE 1
/*
We report truncations only if at least one of MYSQL_BIND::error
pointers is set. In this case stmt->bind_result_done |-ed with
this flag.
*/
#define REPORT_DATA_TRUNCATION 2
/**************** Misc utility functions ****************************/
/*
Reallocate the NET package to have at least length bytes available.
SYNPOSIS
my_realloc_str()
net The NET structure to modify.
length Ensure that net->buff has space for at least
this number of bytes.
RETURN VALUES
0 Success.
1 Error, i.e. out of memory or requested packet size is bigger
than max_allowed_packet. The error code is stored in net->last_errno.
*/
static my_bool my_realloc_str(NET *net, ulong length)
{
ulong buf_length= (ulong) (net->write_pos - net->buff);
my_bool res=0;
DBUG_ENTER("my_realloc_str");
if (buf_length + length > net->max_packet)
{
res= net_realloc(net, buf_length + length);
net->write_pos= net->buff+ buf_length;
}
DBUG_RETURN(res);
}
/* Clear possible error statee of struct NET */
static void net_clear_error(NET *net)
{
if (net->last_errno)
{
net->last_errno= 0;
net->last_error[0]= '\0';
strmov(net->sqlstate, not_error_sqlstate);
}
}
static void stmt_clear_error(MYSQL_STMT *stmt)
{
if (stmt->last_errno)
{
stmt->last_errno= 0;
stmt->last_error[0]= '\0';
strmov(stmt->sqlstate, not_error_sqlstate);
}
}
/*
Set statement error code, sqlstate, and error message
from given errcode and sqlstate.
*/
static void set_stmt_error(MYSQL_STMT * stmt, int errcode,
const char *sqlstate)
{
DBUG_ENTER("set_stmt_error");
DBUG_PRINT("enter", ("error: %d '%s'", errcode, ER(errcode)));
DBUG_ASSERT(stmt != 0);
stmt->last_errno= errcode;
strmov(stmt->last_error, ER(errcode));
strmov(stmt->sqlstate, sqlstate);
DBUG_VOID_RETURN;
}
/*
Set statement error code, sqlstate, and error message.
*/
void set_stmt_errmsg(MYSQL_STMT * stmt, const char *err, int errcode,
const char *sqlstate)
{
DBUG_ENTER("set_stmt_errmsg");
DBUG_PRINT("enter", ("error: %d/%s '%s'", errcode, sqlstate, err));
DBUG_ASSERT(stmt != 0);
stmt->last_errno= errcode;
if (err && err[0])
strmov(stmt->last_error, err);
strmov(stmt->sqlstate, sqlstate);
DBUG_VOID_RETURN;
}
/*
Read and unpack server reply to COM_STMT_PREPARE command (sent from
mysql_stmt_prepare).
SYNOPSIS
cli_read_prepare_result()
mysql connection handle
stmt statement handle
RETURN VALUES
0 ok
1 error
*/
my_bool cli_read_prepare_result(MYSQL *mysql, MYSQL_STMT *stmt)
{
uchar *pos;
uint field_count, param_count;
ulong packet_length;
MYSQL_DATA *fields_data;
DBUG_ENTER("cli_read_prepare_result");
mysql= mysql->last_used_con;
if ((packet_length= net_safe_read(mysql)) == packet_error)
DBUG_RETURN(1);
mysql->warning_count= 0;
pos= (uchar*) mysql->net.read_pos;
stmt->stmt_id= uint4korr(pos+1); pos+= 5;
/* Number of columns in result set */
field_count= uint2korr(pos); pos+= 2;
/* Number of placeholders in the statement */
param_count= uint2korr(pos); pos+= 2;
if (packet_length >= 12)
mysql->warning_count= uint2korr(pos+1);
if (param_count != 0)
{
MYSQL_DATA *param_data;
/* skip parameters data: we don't support it yet */
if (!(param_data= (*mysql->methods->read_rows)(mysql, (MYSQL_FIELD*)0, 7)))
DBUG_RETURN(1);
free_rows(param_data);
}
if (field_count != 0)
{
if (!(mysql->server_status & SERVER_STATUS_AUTOCOMMIT))
mysql->server_status|= SERVER_STATUS_IN_TRANS;
if (!(fields_data= (*mysql->methods->read_rows)(mysql,(MYSQL_FIELD*)0,7)))
DBUG_RETURN(1);
if (!(stmt->fields= unpack_fields(fields_data,&stmt->mem_root,
field_count,0,
mysql->server_capabilities)))
DBUG_RETURN(1);
}
stmt->field_count= field_count;
stmt->param_count= (ulong) param_count;
DBUG_PRINT("exit",("field_count: %u param_count: %u warning_count: %u",
field_count, param_count, (uint) mysql->warning_count));
DBUG_RETURN(0);
}
/*
Allocate memory and init prepared statement structure.
SYNOPSIS
mysql_stmt_init()
mysql connection handle
DESCRIPTION
This is an entry point of the new API. Returned handle stands for
a server-side prepared statement. Memory for this structure (~700
bytes) is allocated using 'malloc'. Once created, the handle can be
reused many times. Created statement handle is bound to connection
handle provided to this call: its lifetime is limited by lifetime
of connection.
'mysql_stmt_init()' is a pure local call, server side structure is
created only in mysql_stmt_prepare.
Next steps you may want to make:
- set a statement attribute (mysql_stmt_attr_set()),
- prepare statement handle with a query (mysql_stmt_prepare()),
- close statement handle and free its memory (mysql_stmt_close()),
- reset statement with mysql_stmt_reset() (a no-op which will
just return).
Behaviour of the rest of API calls on this statement is not defined yet
(though we're working on making each wrong call sequence return
error).
RETURN VALUE
statement structure upon success and NULL if out of
memory
*/
MYSQL_STMT * STDCALL
mysql_stmt_init(MYSQL *mysql)
{
MYSQL_STMT *stmt;
DBUG_ENTER("mysql_stmt_init");
if (!(stmt= (MYSQL_STMT *) my_malloc(sizeof(MYSQL_STMT),
MYF(MY_WME | MY_ZEROFILL))))
{
set_mysql_error(mysql, CR_OUT_OF_MEMORY, unknown_sqlstate);
DBUG_RETURN(0);
}
init_alloc_root(&stmt->mem_root, 2048, 2048);
init_alloc_root(&stmt->result.alloc, 4096, 4096);
stmt->result.alloc.min_malloc= sizeof(MYSQL_ROWS);
mysql->stmts= list_add(mysql->stmts, &stmt->list);
stmt->list.data= stmt;
stmt->state= MYSQL_STMT_INIT_DONE;
stmt->mysql= mysql;
stmt->read_row_func= stmt_read_row_no_result_set;
stmt->prefetch_rows= DEFAULT_PREFETCH_ROWS;
/* The rest of statement members was bzeroed inside malloc */
DBUG_RETURN(stmt);
}
/*
Prepare server side statement with query.
SYNOPSIS
mysql_stmt_prepare()
stmt statement handle
query statement to prepare
length statement length
DESCRIPTION
Associate statement with statement handle. This is done both on
client and server sides. At this point the server parses given query
and creates an internal structure to represent it.
Next steps you may want to make:
- find out if this statement returns a result set by
calling mysql_stmt_field_count(), and get result set metadata
with mysql_stmt_result_metadata(),
- if query contains placeholders, bind input parameters to placeholders
using mysql_stmt_bind_param(),
- otherwise proceed directly to mysql_stmt_execute().
IMPLEMENTATION NOTES
- if this is a re-prepare of the statement, first close previous data
structure on the server and free old statement data
- then send the query to server and get back number of placeholders,
number of columns in result set (if any), and result set metadata.
At the same time allocate memory for input and output parameters
to have less checks in mysql_stmt_bind_{param, result}.
RETURN VALUES
0 success
!0 error
*/
int STDCALL
mysql_stmt_prepare(MYSQL_STMT *stmt, const char *query, ulong length)
{
MYSQL *mysql= stmt->mysql;
DBUG_ENTER("mysql_stmt_prepare");
if (!mysql)
{
/* mysql can be reset in mysql_close called from mysql_reconnect */
set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
DBUG_RETURN(1);
}
if ((int) stmt->state > (int) MYSQL_STMT_INIT_DONE)
{
/* This is second prepare with another statement */
char buff[MYSQL_STMT_HEADER]; /* 4 bytes - stmt id */
if (reset_stmt_handle(stmt, RESET_LONG_DATA | RESET_STORE_RESULT))
DBUG_RETURN(1);
/*
These members must be reset for API to
function in case of error or misuse.
*/
stmt->bind_param_done= stmt->bind_result_done= FALSE;
stmt->param_count= stmt->field_count= 0;
stmt->last_errno= 0;
stmt->last_error[0]= '\0';
free_root(&stmt->mem_root, MYF(MY_KEEP_PREALLOC));
int4store(buff, stmt->stmt_id);
/*
If there was a 'use' result from another statement, or from
mysql_use_result it won't be freed in mysql_stmt_free_result and
we should get 'Commands out of sync' here.
*/
if (simple_command(mysql, COM_STMT_CLOSE, buff, 4, 1))
{
set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
mysql->net.sqlstate);
DBUG_RETURN(1);
}
stmt->state= MYSQL_STMT_INIT_DONE;
}
if (simple_command(mysql, COM_STMT_PREPARE, query, length, 1))
{
set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
mysql->net.sqlstate);
DBUG_RETURN(1);
}
if ((*mysql->methods->read_prepare_result)(mysql, stmt))
{
set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
mysql->net.sqlstate);
DBUG_RETURN(1);
}
/*
alloc_root will return valid address even in case when param_count
and field_count are zero. Thus we should never rely on stmt->bind
or stmt->params when checking for existence of placeholders or
result set.
*/
if (!(stmt->params= (MYSQL_BIND *) alloc_root(&stmt->mem_root,
sizeof(MYSQL_BIND)*
(stmt->param_count +
stmt->field_count))))
{
set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
DBUG_RETURN(1);
}
stmt->bind= stmt->params + stmt->param_count;
stmt->state= MYSQL_STMT_PREPARE_DONE;
DBUG_PRINT("info", ("Parameter count: %ld", stmt->param_count));
DBUG_RETURN(0);
}
/*
Get result set metadata from reply to mysql_stmt_execute.
This is used mainly for SHOW commands, as metadata for these
commands is sent only with result set.
To be removed when all commands will fully support prepared mode.
*/
static unsigned int alloc_stmt_fields(MYSQL_STMT *stmt)
{
MYSQL_FIELD *fields, *field, *end;
MEM_ROOT *alloc= &stmt->mem_root;
MYSQL *mysql= stmt->mysql->last_used_con;
stmt->field_count= mysql->field_count;
/*
Get the field information for non-select statements
like SHOW and DESCRIBE commands
*/
if (!(stmt->fields= (MYSQL_FIELD *) alloc_root(alloc,
sizeof(MYSQL_FIELD) *
stmt->field_count)) ||
!(stmt->bind= (MYSQL_BIND *) alloc_root(alloc,
sizeof(MYSQL_BIND) *
stmt->field_count)))
return 0;
for (fields= mysql->fields, end= fields+stmt->field_count,
field= stmt->fields;
field && fields < end; fields++, field++)
{
field->db = strdup_root(alloc,fields->db);
field->table = strdup_root(alloc,fields->table);
field->org_table= strdup_root(alloc,fields->org_table);
field->name = strdup_root(alloc,fields->name);
field->org_name = strdup_root(alloc,fields->org_name);
field->charsetnr= fields->charsetnr;
field->length = fields->length;
field->type = fields->type;
field->flags = fields->flags;
field->decimals = fields->decimals;
field->def = fields->def ? strdup_root(alloc,fields->def): 0;
field->max_length= 0;
}
return stmt->field_count;
}
/*
Update result set columns metadata if it was sent again in
reply to COM_STMT_EXECUTE.
*/
static void update_stmt_fields(MYSQL_STMT *stmt)
{
MYSQL_FIELD *field= stmt->mysql->fields;
MYSQL_FIELD *field_end= field + stmt->field_count;
MYSQL_FIELD *stmt_field= stmt->fields;
MYSQL_BIND *bind= stmt->bind_result_done ? stmt->bind : 0;
DBUG_ASSERT(stmt->field_count == stmt->mysql->field_count);
for (; field < field_end; ++field, ++stmt_field)
{
stmt_field->charsetnr= field->charsetnr;
stmt_field->length = field->length;
stmt_field->type = field->type;
stmt_field->flags = field->flags;
stmt_field->decimals = field->decimals;
if (bind)
{
/* Ignore return value: it should be 0 if bind_result succeeded. */
(void) setup_one_fetch_function(bind++, stmt_field);
}
}
}
/*
Returns prepared statement metadata in the form of a result set.
SYNOPSIS
mysql_stmt_result_metadata()
stmt statement handle
DESCRIPTION
This function should be used after mysql_stmt_execute().
You can safely check that prepared statement has a result set by calling
mysql_stmt_field_count(): if number of fields is not zero, you can call
this function to get fields metadata.
Next steps you may want to make:
- find out number of columns in result set by calling
mysql_num_fields(res) (the same value is returned by
mysql_stmt_field_count())
- fetch metadata for any column with mysql_fetch_field,
mysql_fetch_field_direct, mysql_fetch_fields, mysql_field_seek.
- free returned MYSQL_RES structure with mysql_free_result.
- proceed to binding of output parameters.
RETURN
NULL statement contains no result set or out of memory.
In the latter case you can retreive error message
with mysql_stmt_error.
MYSQL_RES a result set with no rows
*/
MYSQL_RES * STDCALL
mysql_stmt_result_metadata(MYSQL_STMT *stmt)
{
MYSQL_RES *result;
DBUG_ENTER("mysql_stmt_result_metadata");
/*
stmt->fields is only defined if stmt->field_count is not null;
stmt->field_count is initialized in prepare.
*/
if (!stmt->field_count)
DBUG_RETURN(0);
if (!(result=(MYSQL_RES*) my_malloc(sizeof(*result),
MYF(MY_WME | MY_ZEROFILL))))
{
set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
DBUG_RETURN(0);
}
result->methods= stmt->mysql->methods;
result->eof= 1; /* Marker for buffered */
result->fields= stmt->fields;
result->field_count= stmt->field_count;
/* The rest of members of 'result' was bzeroed inside malloc */
DBUG_RETURN(result);
}
/*
Returns parameter columns meta information in the form of
result set.
SYNOPSYS
mysql_stmt_param_metadata()
stmt statement handle
DESCRIPTION
This function can be called after you prepared the statement handle
with mysql_stmt_prepare().
XXX: not implemented yet.
RETURN
MYSQL_RES on success, 0 if there is no metadata.
Currently this function always returns 0.
*/
MYSQL_RES * STDCALL
mysql_stmt_param_metadata(MYSQL_STMT *stmt)
{
DBUG_ENTER("mysql_stmt_param_metadata");
if (!stmt->param_count)
DBUG_RETURN(0);
/*
TODO: Fix this when server sends the information.
Till then keep a dummy prototype.
*/
DBUG_RETURN(0);
}
/* Store type of parameter in network buffer. */
static void store_param_type(char **pos, MYSQL_BIND *param)
{
uint typecode= param->buffer_type | (param->is_unsigned ? 32768 : 0);
int2store(*pos, typecode);
*pos+= 2;
}
/*
Functions to store parameter data in network packet.
SYNOPSIS
store_param_xxx()
net MySQL NET connection
param MySQL bind param
DESCRIPTION
These funtions are invoked from mysql_stmt_execute() by
MYSQL_BIND::store_param_func pointer. This pointer is set once per
many executions in mysql_stmt_bind_param(). The caller must ensure
that network buffer have enough capacity to store parameter
(MYSQL_BIND::buffer_length contains needed number of bytes).
*/
static void store_param_tinyint(NET *net, MYSQL_BIND *param)
{
*(net->write_pos++)= *(uchar *) param->buffer;
}
static void store_param_short(NET *net, MYSQL_BIND *param)
{
short value= *(short*) param->buffer;
int2store(net->write_pos,value);
net->write_pos+=2;
}
static void store_param_int32(NET *net, MYSQL_BIND *param)
{
int32 value= *(int32*) param->buffer;
int4store(net->write_pos,value);
net->write_pos+=4;
}
static void store_param_int64(NET *net, MYSQL_BIND *param)
{
longlong value= *(longlong*) param->buffer;
int8store(net->write_pos,value);
net->write_pos+= 8;
}
static void store_param_float(NET *net, MYSQL_BIND *param)
{
float value= *(float*) param->buffer;
float4store(net->write_pos, value);
net->write_pos+= 4;
}
static void store_param_double(NET *net, MYSQL_BIND *param)
{
double value= *(double*) param->buffer;
float8store(net->write_pos, value);
net->write_pos+= 8;
}
static void store_param_time(NET *net, MYSQL_BIND *param)
{
MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
char buff[MAX_TIME_REP_LENGTH], *pos;
uint length;
pos= buff+1;
pos[0]= tm->neg ? 1: 0;
int4store(pos+1, tm->day);
pos[5]= (uchar) tm->hour;
pos[6]= (uchar) tm->minute;
pos[7]= (uchar) tm->second;
int4store(pos+8, tm->second_part);
if (tm->second_part)
length= 12;
else if (tm->hour || tm->minute || tm->second || tm->day)
length= 8;
else
length= 0;
buff[0]= (char) length++;
memcpy((char *)net->write_pos, buff, length);
net->write_pos+= length;
}
static void net_store_datetime(NET *net, MYSQL_TIME *tm)
{
char buff[MAX_DATETIME_REP_LENGTH], *pos;
uint length;
pos= buff+1;
int2store(pos, tm->year);
pos[2]= (uchar) tm->month;
pos[3]= (uchar) tm->day;
pos[4]= (uchar) tm->hour;
pos[5]= (uchar) tm->minute;
pos[6]= (uchar) tm->second;
int4store(pos+7, tm->second_part);
if (tm->second_part)
length= 11;
else if (tm->hour || tm->minute || tm->second)
length= 7;
else if (tm->year || tm->month || tm->day)
length= 4;
else
length= 0;
buff[0]= (char) length++;
memcpy((char *)net->write_pos, buff, length);
net->write_pos+= length;
}
static void store_param_date(NET *net, MYSQL_BIND *param)
{
MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
tm->hour= tm->minute= tm->second= 0;
tm->second_part= 0;
net_store_datetime(net, tm);
}
static void store_param_datetime(NET *net, MYSQL_BIND *param)
{
MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
net_store_datetime(net, tm);
}
static void store_param_str(NET *net, MYSQL_BIND *param)
{
/* param->length is always set in mysql_stmt_bind_param */
ulong length= *param->length;
char *to= (char *) net_store_length((char *) net->write_pos, length);
memcpy(to, param->buffer, length);
net->write_pos= (uchar*) to+length;
}
/*
Mark if the parameter is NULL.
SYNOPSIS
store_param_null()
net MySQL NET connection
param MySQL bind param
DESCRIPTION
A data package starts with a string of bits where we set a bit
if a parameter is NULL. Unlike bit string in result set row, here
we don't have reserved bits for OK/error packet.
*/
static void store_param_null(NET *net, MYSQL_BIND *param)
{
uint pos= param->param_number;
net->buff[pos/8]|= (uchar) (1 << (pos & 7));
}
/*
Store one parameter in network packet: data is read from
client buffer and saved in network packet by means of one
of store_param_xxxx functions.
*/
static my_bool store_param(MYSQL_STMT *stmt, MYSQL_BIND *param)
{
NET *net= &stmt->mysql->net;
DBUG_ENTER("store_param");
DBUG_PRINT("enter",("type: %d, buffer:%lx, length: %lu is_null: %d",
param->buffer_type,
param->buffer ? param->buffer : "0", *param->length,
*param->is_null));
if (*param->is_null)
store_param_null(net, param);
else
{
/*
Param->length should ALWAYS point to the correct length for the type
Either to the length pointer given by the user or param->buffer_length
*/
if ((my_realloc_str(net, *param->length)))
{
set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
DBUG_RETURN(1);
}
(*param->store_param_func)(net, param);
}
DBUG_RETURN(0);
}
/*
Auxilary function to send COM_STMT_EXECUTE packet to server and read reply.
Used from cli_stmt_execute, which is in turn used by mysql_stmt_execute.
*/
static my_bool execute(MYSQL_STMT *stmt, char *packet, ulong length)
{
MYSQL *mysql= stmt->mysql;
NET *net= &mysql->net;
char buff[4 /* size of stmt id */ +
5 /* execution flags */];
DBUG_ENTER("execute");
DBUG_DUMP("packet", packet, length);
mysql->last_used_con= mysql;
int4store(buff, stmt->stmt_id); /* Send stmt id to server */
buff[4]= (char) stmt->flags;
int4store(buff+5, 1); /* iteration count */
if (cli_advanced_command(mysql, COM_STMT_EXECUTE, buff, sizeof(buff),
packet, length, 1) ||
(*mysql->methods->read_query_result)(mysql))
{
set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
DBUG_RETURN(1);
}
stmt->affected_rows= mysql->affected_rows;
stmt->server_status= mysql->server_status;
stmt->insert_id= mysql->insert_id;
DBUG_RETURN(0);
}
int cli_stmt_execute(MYSQL_STMT *stmt)
{
DBUG_ENTER("cli_stmt_execute");
if (stmt->param_count)
{
NET *net= &stmt->mysql->net;
MYSQL_BIND *param, *param_end;
char *param_data;
ulong length;
uint null_count;
my_bool result;
if (!stmt->bind_param_done)
{
set_stmt_error(stmt, CR_PARAMS_NOT_BOUND, unknown_sqlstate);
DBUG_RETURN(1);
}
if (stmt->mysql->status != MYSQL_STATUS_READY)
{
set_stmt_error(stmt, CR_COMMANDS_OUT_OF_SYNC, unknown_sqlstate);
DBUG_RETURN(1);
}
net_clear(net); /* Sets net->write_pos */
/* Reserve place for null-marker bytes */
null_count= (stmt->param_count+7) /8;
if (my_realloc_str(net, null_count + 1))
{
set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
DBUG_RETURN(1);
}
bzero((char*) net->write_pos, null_count);
net->write_pos+= null_count;
param_end= stmt->params + stmt->param_count;
/* In case if buffers (type) altered, indicate to server */
*(net->write_pos)++= (uchar) stmt->send_types_to_server;
if (stmt->send_types_to_server)
{
if (my_realloc_str(net, 2 * stmt->param_count))
{
set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
DBUG_RETURN(1);
}
/*
Store types of parameters in first in first package
that is sent to the server.
*/
for (param= stmt->params; param < param_end ; param++)
store_param_type((char**) &net->write_pos, param);
}
for (param= stmt->params; param < param_end; param++)
{
/* check if mysql_stmt_send_long_data() was used */
if (param->long_data_used)
param->long_data_used= 0; /* Clear for next execute call */
else if (store_param(stmt, param))
DBUG_RETURN(1);
}
length= (ulong) (net->write_pos - net->buff);
/* TODO: Look into avoding the following memdup */
if (!(param_data= my_memdup((const char*) net->buff, length, MYF(0))))
{
set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
DBUG_RETURN(1);
}
result= execute(stmt, param_data, length);
stmt->send_types_to_server=0;
my_free(param_data, MYF(MY_WME));
DBUG_RETURN(result);
}
DBUG_RETURN((int) execute(stmt,0,0));
}
/*
Read one row from buffered result set. Result set is created by prior
call to mysql_stmt_store_result().
SYNOPSIS
stmt_read_row_buffered()
RETURN VALUE
0 - success; *row is set to valid row pointer (row data
is stored in result set buffer)
MYSQL_NO_DATA - end of result set. *row is set to NULL
*/
static int stmt_read_row_buffered(MYSQL_STMT *stmt, unsigned char **row)
{
if (stmt->data_cursor)
{
*row= (uchar *) stmt->data_cursor->data;
stmt->data_cursor= stmt->data_cursor->next;
return 0;
}
*row= 0;
return MYSQL_NO_DATA;
}
/*
Read one row from network: unbuffered non-cursor fetch.
If last row was read, or error occured, erase this statement
from record pointing to object unbuffered fetch is performed from.
SYNOPSIS
stmt_read_row_unbuffered()
stmt statement handle
row pointer to write pointer to row data;
RETURN VALUE
0 - success; *row contains valid address of a row;
row data is stored in network buffer
1 - error; error code is written to
stmt->last_{errno,error}; *row is not changed
MYSQL_NO_DATA - end of file was read from network;
*row is set to NULL
*/
static int stmt_read_row_unbuffered(MYSQL_STMT *stmt, unsigned char **row)
{
int rc= 1;
MYSQL *mysql= stmt->mysql;
/*
This function won't be called if stmt->field_count is zero
or execution wasn't done: this is ensured by mysql_stmt_execute.
*/
if (!mysql)
{
set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
return 1;
}
if (mysql->status != MYSQL_STATUS_GET_RESULT)
{
set_stmt_error(stmt, stmt->unbuffered_fetch_cancelled ?
CR_FETCH_CANCELED : CR_COMMANDS_OUT_OF_SYNC,
unknown_sqlstate);
goto error;
}
if ((*mysql->methods->unbuffered_fetch)(mysql, (char**) row))
{
set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
mysql->net.sqlstate);
/*
If there was an error, there are no more pending rows:
reset statement status to not hang up in following
mysql_stmt_close (it will try to flush result set before
closing the statement).
*/
mysql->status= MYSQL_STATUS_READY;
goto error;
}
if (!*row)
{
mysql->status= MYSQL_STATUS_READY;
rc= MYSQL_NO_DATA;
goto error;
}
return 0;
error:
if (mysql->unbuffered_fetch_owner == &stmt->unbuffered_fetch_cancelled)
mysql->unbuffered_fetch_owner= 0;
return rc;
}
/*
Fetch statement row using server side cursor.
SYNOPSIS
stmt_read_row_from_cursor()
RETURN VALUE
0 success
1 error
MYSQL_NO_DATA end of data
*/
static int
stmt_read_row_from_cursor(MYSQL_STMT *stmt, unsigned char **row)
{
if (stmt->data_cursor)
return stmt_read_row_buffered(stmt, row);
if (stmt->server_status & SERVER_STATUS_LAST_ROW_SENT)
stmt->server_status &= ~SERVER_STATUS_LAST_ROW_SENT;
else
{
MYSQL *mysql= stmt->mysql;
NET *net= &mysql->net;
MYSQL_DATA *result= &stmt->result;
char buff[4 /* statement id */ +
4 /* number of rows to fetch */];
free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
result->data= NULL;
result->rows= 0;
/* Send row request to the server */
int4store(buff, stmt->stmt_id);
int4store(buff + 4, stmt->prefetch_rows); /* number of rows to fetch */
if ((*mysql->methods->advanced_command)(mysql, COM_STMT_FETCH,
buff, sizeof(buff), NullS, 0, 1))
{
set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
return 1;
}
if ((*mysql->methods->read_rows_from_cursor)(stmt))
return 1;
stmt->server_status= mysql->server_status;
stmt->data_cursor= result->data;
return stmt_read_row_buffered(stmt, row);
}
*row= 0;
return MYSQL_NO_DATA;
}
/*
Default read row function to not SIGSEGV in client in
case of wrong sequence of API calls.
*/
static int
stmt_read_row_no_data(MYSQL_STMT *stmt __attribute__((unused)),
unsigned char **row __attribute__((unused)))
{
return MYSQL_NO_DATA;
}
static int
stmt_read_row_no_result_set(MYSQL_STMT *stmt __attribute__((unused)),
unsigned char **row __attribute__((unused)))
{
set_stmt_error(stmt, CR_NO_RESULT_SET, unknown_sqlstate);
return 1;
}
/*
Get/set statement attributes
SYNOPSIS
mysql_stmt_attr_get()
mysql_stmt_attr_set()
attr_type statement attribute
value casted to const void * pointer to value.
RETURN VALUE
0 success
!0 wrong attribute type
*/
my_bool STDCALL mysql_stmt_attr_set(MYSQL_STMT *stmt,
enum enum_stmt_attr_type attr_type,
const void *value)
{
switch (attr_type) {
case STMT_ATTR_UPDATE_MAX_LENGTH:
stmt->update_max_length= value ? *(const my_bool*) value : 0;
break;
case STMT_ATTR_CURSOR_TYPE:
{
ulong cursor_type;
cursor_type= value ? *(ulong*) value : 0UL;
if (cursor_type > (ulong) CURSOR_TYPE_READ_ONLY)
goto err_not_implemented;
stmt->flags= cursor_type;
break;
}
case STMT_ATTR_PREFETCH_ROWS:
{
ulong prefetch_rows= value ? *(ulong*) value : DEFAULT_PREFETCH_ROWS;
if (value == 0)
return TRUE;
stmt->prefetch_rows= prefetch_rows;
break;
}
default:
goto err_not_implemented;
}
return FALSE;
err_not_implemented:
set_stmt_error(stmt, CR_NOT_IMPLEMENTED, unknown_sqlstate);
return TRUE;
}
my_bool STDCALL mysql_stmt_attr_get(MYSQL_STMT *stmt,
enum enum_stmt_attr_type attr_type,
void *value)
{
switch (attr_type) {
case STMT_ATTR_UPDATE_MAX_LENGTH:
*(ulong*) value= stmt->update_max_length;
break;
case STMT_ATTR_CURSOR_TYPE:
*(ulong*) value= stmt->flags;
break;
case STMT_ATTR_PREFETCH_ROWS:
*(ulong*) value= stmt->prefetch_rows;
break;
default:
return TRUE;
}
return FALSE;
}
/*
Send placeholders data to server (if there are placeholders)
and execute prepared statement.
SYNOPSIS
mysql_stmt_execute()
stmt statement handle. The handle must be created
with mysql_stmt_init() and prepared with
mysql_stmt_prepare(). If there are placeholders
in the statement they must be bound to local
variables with mysql_stmt_bind_param().
DESCRIPTION
This function will automatically flush pending result
set (if there is one), send parameters data to the server
and read result of statement execution.
If previous result set was cached with mysql_stmt_store_result()
it will also be freed in the beginning of this call.
The server can return 3 types of responses to this command:
- error, can be retrieved with mysql_stmt_error()
- ok, no result set pending. In this case we just update
stmt->insert_id and stmt->affected_rows.
- the query returns a result set: there could be 0 .. N
rows in it. In this case the server can also send updated
result set metadata.
Next steps you may want to make:
- find out if there is result set with mysql_stmt_field_count().
If there is one:
- optionally, cache entire result set on client to unblock
connection with mysql_stmt_store_result()
- bind client variables to result set columns and start read rows
with mysql_stmt_fetch().
- reset statement with mysql_stmt_reset() or close it with
mysql_stmt_close()
Otherwise:
- find out last insert id and number of affected rows with
mysql_stmt_insert_id(), mysql_stmt_affected_rows()
RETURN
0 success
1 error, message can be retrieved with mysql_stmt_error().
*/
int STDCALL mysql_stmt_execute(MYSQL_STMT *stmt)
{
MYSQL *mysql= stmt->mysql;
DBUG_ENTER("mysql_stmt_execute");
if (!mysql)
{
set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
DBUG_RETURN(1);
}
if (reset_stmt_handle(stmt, RESET_STORE_RESULT))
DBUG_RETURN(1);
/*
No need to check for stmt->state: if the statement wasn't
prepared we'll get 'unknown statement handler' error from server.
*/
if (mysql->methods->stmt_execute(stmt))
DBUG_RETURN(1);
if (mysql->field_count)
{
/* Server has sent result set metadata */
if (stmt->field_count == 0)
{
/*
This is 'SHOW'/'EXPLAIN'-like query. Current implementation of
prepared statements can't send result set metadata for these queries
on prepare stage. Read it now.
*/
alloc_stmt_fields(stmt);
}
else
{
/*
Update result set metadata if it for some reason changed between
prepare and execute, i.e.:
- in case of 'SELECT ?' we don't know column type unless data was
supplied to mysql_stmt_execute, so updated column type is sent
now.
- if data dictionary changed between prepare and execute, for
example a table used in the query was altered.
Note, that now (4.1.3) we always send metadata in reply to
COM_STMT_EXECUTE (even if it is not necessary), so either this or
previous branch always works.
TODO: send metadata only when it's really necessary and add a warning
'Metadata changed' when it's sent twice.
*/
update_stmt_fields(stmt);
}
}
stmt->state= MYSQL_STMT_EXECUTE_DONE;
if (stmt->field_count)
{
if (stmt->server_status & SERVER_STATUS_CURSOR_EXISTS)
{
mysql->status= MYSQL_STATUS_READY;
stmt->read_row_func= stmt_read_row_from_cursor;
}
else if (stmt->flags & CURSOR_TYPE_READ_ONLY)
{
/*
This is a single-row result set, a result set with no rows, EXPLAIN,
SHOW VARIABLES, or some other command which either a) bypasses the
cursors framework in the server and writes rows directly to the
network or b) is more efficient if all (few) result set rows are
precached on client and server's resources are freed.
*/
DBUG_RETURN(mysql_stmt_store_result(stmt));
}
else
{
stmt->mysql->unbuffered_fetch_owner= &stmt->unbuffered_fetch_cancelled;
stmt->unbuffered_fetch_cancelled= FALSE;
stmt->read_row_func= stmt_read_row_unbuffered;
}
}
DBUG_RETURN(0);
}
/*
Return total parameters count in the statement
*/
ulong STDCALL mysql_stmt_param_count(MYSQL_STMT * stmt)
{
DBUG_ENTER("mysql_stmt_param_count");
DBUG_RETURN(stmt->param_count);
}
/*
Return total affected rows from the last statement
*/
my_ulonglong STDCALL mysql_stmt_affected_rows(MYSQL_STMT *stmt)
{
return stmt->affected_rows;
}
/*
Returns the number of result columns for the most recent query
run on this statement.
*/
unsigned int STDCALL mysql_stmt_field_count(MYSQL_STMT *stmt)
{
return stmt->field_count;
}
/*
Return last inserted id for auto_increment columns.
SYNOPSIS
mysql_stmt_insert_id()
stmt statement handle
DESCRIPTION
Current implementation of this call has a caveat: stmt->insert_id is
unconditionally updated from mysql->insert_id in the end of each
mysql_stmt_execute(). This works OK if mysql->insert_id contains new
value (sent in reply to mysql_stmt_execute()), otherwise stmt->insert_id
value gets undefined, as it's updated from some arbitrary value saved in
connection structure during some other call.
*/
my_ulonglong STDCALL mysql_stmt_insert_id(MYSQL_STMT *stmt)
{
return stmt->insert_id;
}
static my_bool int_is_null_true= 1; /* Used for MYSQL_TYPE_NULL */
static my_bool int_is_null_false= 0;
/*
Set up input data buffers for a statement.
SYNOPSIS
mysql_stmt_bind_param()
stmt statement handle
The statement must be prepared with mysql_stmt_prepare().
bind Array of mysql_stmt_param_count() bind parameters.
This function doesn't check that size of this argument
is >= mysql_stmt_field_count(): it's user's responsibility.
DESCRIPTION
Use this call after mysql_stmt_prepare() to bind user variables to
placeholders.
Each element of bind array stands for a placeholder. Placeholders
are counted from 0. For example statement
'INSERT INTO t (a, b) VALUES (?, ?)'
contains two placeholders, and for such statement you should supply
bind array of two elements (MYSQL_BIND bind[2]).
By properly initializing bind array you can bind virtually any
C language type to statement's placeholders:
First, it's strongly recommended to always zero-initialize entire
bind structure before setting its members. This will both shorten
your application code and make it robust to future extensions of
MYSQL_BIND structure.
Then you need to assign typecode of your application buffer to
MYSQL_BIND::buffer_type. The following typecodes with their
correspondence to C language types are supported:
MYSQL_TYPE_TINY for 8-bit integer variables. Normally it's
'signed char' and 'unsigned char';
MYSQL_TYPE_SHORT for 16-bit signed and unsigned variables. This
is usually 'short' and 'unsigned short';
MYSQL_TYPE_LONG for 32-bit signed and unsigned variables. It
corresponds to 'int' and 'unsigned int' on
vast majority of platforms. On IA-32 and some
other 32-bit systems you can also use 'long'
here;
MYSQL_TYPE_LONGLONG 64-bit signed or unsigned integer. Stands for
'[unsigned] long long' on most platforms;
MYSQL_TYPE_FLOAT 32-bit floating point type, 'float' on most
systems;
MYSQL_TYPE_DOUBLE 64-bit floating point type, 'double' on most
systems;
MYSQL_TYPE_TIME broken-down time stored in MYSQL_TIME
structure
MYSQL_TYPE_DATE date stored in MYSQL_TIME structure
MYSQL_TYPE_DATETIME datetime stored in MYSQL_TIME structure See
more on how to use these types for sending
dates and times below;
MYSQL_TYPE_STRING character string, assumed to be in
character-set-client. If character set of
client is not equal to character set of
column, value for this placeholder will be
converted to destination character set before
insert.
MYSQL_TYPE_BLOB sequence of bytes. This sequence is assumed to
be in binary character set (which is the same
as no particular character set), and is never
converted to any other character set. See also
notes about supplying string/blob length
below.
MYSQL_TYPE_NULL special typecode for binding nulls.
These C/C++ types are not supported yet by the API: long double,
bool.
As you can see from the list above, it's responsibility of
application programmer to ensure that chosen typecode properly
corresponds to host language type. For example on all platforms
where we build MySQL packages (as of MySQL 4.1.4) int is a 32-bit
type. So for int you can always assume that proper typecode is
MYSQL_TYPE_LONG (however queer it sounds, the name is legacy of the
old MySQL API). In contrary sizeof(long) can be 4 or 8 8-bit bytes,
depending on platform.
TODO: provide client typedefs for each integer and floating point
typecode, i. e. int8, uint8, float32, etc.
Once typecode was set, it's necessary to assign MYSQL_BIND::buffer
to point to the buffer of given type. Finally, additional actions
may be taken for some types or use cases:
Binding integer types.
For integer types you might also need to set MYSQL_BIND::is_unsigned
member. Set it to TRUE when binding unsigned char, unsigned short,
unsigned int, unsigned long, unsigned long long.
Binding floating point types.
For floating point types you just need to set
MYSQL_BIND::buffer_type and MYSQL_BIND::buffer. The rest of the
members should be zero-initialized.
Binding NULLs.
You might have a column always NULL, never NULL, or sometimes NULL.
For an always NULL column set MYSQL_BIND::buffer_type to
MYSQL_TYPE_NULL. The rest of the members just need to be
zero-initialized. For never NULL columns set MYSQL_BIND::is_null to
0, or this has already been done if you zero-initialized the entire
structure. If you set MYSQL_TYPE::is_null to point to an
application buffer of type 'my_bool', then this buffer will be
checked on each execution: this way you can set the buffer to TRUE,
or any non-0 value for NULLs, and to FALSE or 0 for not NULL data.
Binding text strings and sequences of bytes.
For strings, in addition to MYSQL_BIND::buffer_type and
MYSQL_BIND::buffer you need to set MYSQL_BIND::length or
MYSQL_BIND::buffer_length.
If 'length' is set, 'buffer_length' is ignored. 'buffer_length'
member should be used when size of string doesn't change between
executions. If you want to vary buffer length for each value, set
'length' to point to an application buffer of type 'unsigned long'
and set this long to length of the string before each
mysql_stmt_execute().
Binding dates and times.
For binding dates and times prepared statements API provides clients
with MYSQL_TIME structure. A pointer to instance of this structure
should be assigned to MYSQL_BIND::buffer whenever MYSQL_TYPE_TIME,
MYSQL_TYPE_DATE, MYSQL_TYPE_DATETIME typecodes are used. When
typecode is MYSQL_TYPE_TIME, only members 'hour', 'minute', 'second'
and 'neg' (is time offset negative) are used. These members only
will be sent to the server.
MYSQL_TYPE_DATE implies use of 'year', 'month', 'day', 'neg'.
MYSQL_TYPE_DATETIME utilizes both parts of MYSQL_TIME structure.
You don't have to set MYSQL_TIME::time_type member: it's not used
when sending data to the server, typecode information is enough.
'second_part' member can hold microsecond precision of time value,
but now it's only supported on protocol level: you can't store
microsecond in a column, or use in temporal calculations. However,
if you send a time value with microsecond part for 'SELECT ?',
statement, you'll get it back unchanged from the server.
Data conversion.
If conversion from host language type to data representation,
corresponding to SQL type, is required it's done on the server.
Data truncation is possible when conversion is lossy. For example,
if you supply MYSQL_TYPE_DATETIME value out of valid SQL type
TIMESTAMP range, the same conversion will be applied as if this
value would have been sent as string in the old protocol.
TODO: document how the server will behave in case of truncation/data
loss.
After variables were bound, you can repeatedly set/change their
values and mysql_stmt_execute() the statement.
See also: mysql_stmt_send_long_data() for sending long text/blob
data in pieces, examples in tests/mysql_client_test.c.
Next steps you might want to make:
- execute statement with mysql_stmt_execute(),
- reset statement using mysql_stmt_reset() or reprepare it with
another query using mysql_stmt_prepare()
- close statement with mysql_stmt_close().
IMPLEMENTATION
The function copies given bind array to internal storage of the
statement, and sets up typecode-specific handlers to perform
serialization of bound data. This means that although you don't need
to call this routine after each assignment to bind buffers, you
need to call it each time you change parameter typecodes, or other
members of MYSQL_BIND array.
This is a pure local call. Data types of client buffers are sent
along with buffers' data at first execution of the statement.
RETURN
0 success
1 error, can be retrieved with mysql_stmt_error.
*/
my_bool STDCALL mysql_stmt_bind_param(MYSQL_STMT *stmt, MYSQL_BIND *bind)
{
uint count=0;
MYSQL_BIND *param, *end;
DBUG_ENTER("mysql_stmt_bind_param");
if (!stmt->param_count)
{
if ((int) stmt->state < (int) MYSQL_STMT_PREPARE_DONE)
{
set_stmt_error(stmt, CR_NO_PREPARE_STMT, unknown_sqlstate);
DBUG_RETURN(1);
}
DBUG_RETURN(0);
}
/* Allocated on prepare */
memcpy((char*) stmt->params, (char*) bind,
sizeof(MYSQL_BIND) * stmt->param_count);
for (param= stmt->params, end= param+stmt->param_count;
param < end ;
param++)
{
param->param_number= count++;
param->long_data_used= 0;
/* If param->is_null is not set, then the value can never be NULL */
if (!param->is_null)
param->is_null= &int_is_null_false;
/* Setup data copy functions for the different supported types */
switch (param->buffer_type) {
case MYSQL_TYPE_NULL:
param->is_null= &int_is_null_true;
break;
case MYSQL_TYPE_TINY:
/* Force param->length as this is fixed for this type */
param->length= &param->buffer_length;
param->buffer_length= 1;
param->store_param_func= store_param_tinyint;
break;
case MYSQL_TYPE_SHORT:
param->length= &param->buffer_length;
param->buffer_length= 2;
param->store_param_func= store_param_short;
break;
case MYSQL_TYPE_LONG:
param->length= &param->buffer_length;
param->buffer_length= 4;
param->store_param_func= store_param_int32;
break;
case MYSQL_TYPE_LONGLONG:
param->length= &param->buffer_length;
param->buffer_length= 8;
param->store_param_func= store_param_int64;
break;
case MYSQL_TYPE_FLOAT:
param->length= &param->buffer_length;
param->buffer_length= 4;
param->store_param_func= store_param_float;
break;
case MYSQL_TYPE_DOUBLE:
param->length= &param->buffer_length;
param->buffer_length= 8;
param->store_param_func= store_param_double;
break;
case MYSQL_TYPE_TIME:
param->store_param_func= store_param_time;
param->buffer_length= MAX_TIME_REP_LENGTH;
break;
case MYSQL_TYPE_DATE:
param->store_param_func= store_param_date;
param->buffer_length= MAX_DATE_REP_LENGTH;
break;
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
param->store_param_func= store_param_datetime;
param->buffer_length= MAX_DATETIME_REP_LENGTH;
break;
case MYSQL_TYPE_TINY_BLOB:
case MYSQL_TYPE_MEDIUM_BLOB:
case MYSQL_TYPE_LONG_BLOB:
case MYSQL_TYPE_BLOB:
case MYSQL_TYPE_VARCHAR:
case MYSQL_TYPE_VAR_STRING:
case MYSQL_TYPE_STRING:
case MYSQL_TYPE_DECIMAL:
case MYSQL_TYPE_NEWDECIMAL:
param->store_param_func= store_param_str;
/*
For variable length types user must set either length or
buffer_length.
*/
break;
default:
strmov(stmt->sqlstate, unknown_sqlstate);
sprintf(stmt->last_error,
ER(stmt->last_errno= CR_UNSUPPORTED_PARAM_TYPE),
param->buffer_type, count);
DBUG_RETURN(1);
}
/*
If param->length is not given, change it to point to buffer_length.
This way we can always use *param->length to get the length of data
*/
if (!param->length)
param->length= &param->buffer_length;
}
/* We have to send/resend type information to MySQL */
stmt->send_types_to_server= TRUE;
stmt->bind_param_done= TRUE;
DBUG_RETURN(0);
}
/********************************************************************
Long data implementation
*********************************************************************/
/*
Send long data in pieces to the server
SYNOPSIS
mysql_stmt_send_long_data()
stmt Statement handler
param_number Parameter number (0 - N-1)
data Data to send to server
length Length of data to send (may be 0)
DESCRIPTION
This call can be used repeatedly to send long data in pieces
for any string/binary placeholder. Data supplied for
a placeholder is saved at server side till execute, and then
used instead of value from MYSQL_BIND object. More precisely,
if long data for a parameter was supplied, MYSQL_BIND object
corresponding to this parameter is not sent to server. In the
end of execution long data states of placeholders are reset,
so next time values of such placeholders will be taken again
from MYSQL_BIND array.
The server does not reply to this call: if there was an error
in data handling (which now only can happen if server run out
of memory) it would be returned in reply to
mysql_stmt_execute().
You should choose type of long data carefully if you care
about character set conversions performed by server when the
statement is executed. No conversion is performed at all for
MYSQL_TYPE_BLOB and other binary typecodes. For
MYSQL_TYPE_STRING and the rest of text placeholders data is
converted from client character set to character set of
connection. If these character sets are different, this
conversion may require additional memory at server, equal to
total size of supplied pieces.
RETURN VALUES
0 ok
1 error
*/
my_bool STDCALL
mysql_stmt_send_long_data(MYSQL_STMT *stmt, uint param_number,
const char *data, ulong length)
{
MYSQL_BIND *param;
DBUG_ENTER("mysql_stmt_send_long_data");
DBUG_ASSERT(stmt != 0);
DBUG_PRINT("enter",("param no : %d, data : %lx, length : %ld",
param_number, data, length));
/*
We only need to check for stmt->param_count, if it's not null
prepare was done.
*/
if (param_number >= stmt->param_count)
{
set_stmt_error(stmt, CR_INVALID_PARAMETER_NO, unknown_sqlstate);
DBUG_RETURN(1);
}
param= stmt->params+param_number;
if (param->buffer_type < MYSQL_TYPE_TINY_BLOB ||
param->buffer_type > MYSQL_TYPE_STRING)
{
/* Long data handling should be used only for string/binary types */
strmov(stmt->sqlstate, unknown_sqlstate);
sprintf(stmt->last_error, ER(stmt->last_errno= CR_INVALID_BUFFER_USE),
param->param_number);
DBUG_RETURN(1);
}
/*
Send long data packet if there is data or we're sending long data
for the first time.
*/
if (length || param->long_data_used == 0)
{
MYSQL *mysql= stmt->mysql;
/* Packet header: stmt id (4 bytes), param no (2 bytes) */
char buff[MYSQL_LONG_DATA_HEADER];
int4store(buff, stmt->stmt_id);
int2store(buff + 4, param_number);
param->long_data_used= 1;
/*
Note that we don't get any ok packet from the server in this case
This is intentional to save bandwidth.
*/
if ((*mysql->methods->advanced_command)(mysql, COM_STMT_SEND_LONG_DATA,
buff, sizeof(buff), data,
length, 1))
{
set_stmt_errmsg(stmt, mysql->net.last_error,
mysql->net.last_errno, mysql->net.sqlstate);
DBUG_RETURN(1);
}
}
DBUG_RETURN(0);
}
/********************************************************************
Fetch and conversion of result set rows (binary protocol).
*********************************************************************/
/*
Read date, (time, datetime) value from network buffer and store it
in MYSQL_TIME structure.
SYNOPSIS
read_binary_{date,time,datetime}()
tm MYSQL_TIME structure to fill
pos pointer to current position in network buffer.
These functions increase pos to point to the beginning of the
next column.
Auxiliary functions to read time (date, datetime) values from network
buffer and store in MYSQL_TIME structure. Jointly used by conversion
and no-conversion fetching.
*/
static void read_binary_time(MYSQL_TIME *tm, uchar **pos)
{
/* net_field_length will set pos to the first byte of data */
uint length= net_field_length(pos);
if (length)
{
uchar *to= *pos;
tm->neg= (bool) to[0];
tm->day= (ulong) sint4korr(to+1);
tm->hour= (uint) to[5];
tm->minute= (uint) to[6];
tm->second= (uint) to[7];
tm->second_part= (length > 8) ? (ulong) sint4korr(to+8) : 0;
tm->year= tm->month= 0;
if (tm->day)
{
/* Convert days to hours at once */
tm->hour+= tm->day*24;
tm->day= 0;
}
tm->time_type= MYSQL_TIMESTAMP_TIME;
*pos+= length;
}
else
set_zero_time(tm, MYSQL_TIMESTAMP_TIME);
}
static void read_binary_datetime(MYSQL_TIME *tm, uchar **pos)
{
uint length= net_field_length(pos);
if (length)
{
uchar *to= *pos;
tm->neg= 0;
tm->year= (uint) sint2korr(to);
tm->month= (uint) to[2];
tm->day= (uint) to[3];
if (length > 4)
{
tm->hour= (uint) to[4];
tm->minute= (uint) to[5];
tm->second= (uint) to[6];
}
else
tm->hour= tm->minute= tm->second= 0;
tm->second_part= (length > 7) ? (ulong) sint4korr(to+7) : 0;
tm->time_type= MYSQL_TIMESTAMP_DATETIME;
*pos+= length;
}
else
set_zero_time(tm, MYSQL_TIMESTAMP_DATETIME);
}
static void read_binary_date(MYSQL_TIME *tm, uchar **pos)
{
uint length= net_field_length(pos);
if (length)
{
uchar *to= *pos;
tm->year = (uint) sint2korr(to);
tm->month= (uint) to[2];
tm->day= (uint) to[3];
tm->hour= tm->minute= tm->second= 0;
tm->second_part= 0;
tm->neg= 0;
tm->time_type= MYSQL_TIMESTAMP_DATE;
*pos+= length;
}
else
set_zero_time(tm, MYSQL_TIMESTAMP_DATE);
}
/*
Convert string to supplied buffer of any type.
SYNOPSIS
fetch_string_with_conversion()
param output buffer descriptor
value column data
length data length
*/
static void fetch_string_with_conversion(MYSQL_BIND *param, char *value,
uint length)
{
char *buffer= (char *)param->buffer;
int err= 0;
char *endptr= value + length;
/*
This function should support all target buffer types: the rest
of conversion functions can delegate conversion to it.
*/
switch(param->buffer_type) {
case MYSQL_TYPE_NULL: /* do nothing */
break;
case MYSQL_TYPE_TINY:
{
longlong data= my_strtoll10(value, &endptr, &err);
*param->error= (IS_TRUNCATED(data, param->is_unsigned,
INT_MIN8, INT_MAX8, UINT_MAX8) || err > 0);
*buffer= (uchar) data;
break;
}
case MYSQL_TYPE_SHORT:
{
longlong data= my_strtoll10(value, &endptr, &err);
*param->error= (IS_TRUNCATED(data, param->is_unsigned,
INT_MIN16, INT_MAX16, UINT_MAX16) || err > 0);
shortstore(buffer, (short) data);
break;
}
case MYSQL_TYPE_LONG:
{
longlong data= my_strtoll10(value, &endptr, &err);
*param->error= (IS_TRUNCATED(data, param->is_unsigned,
INT_MIN32, INT_MAX32, UINT_MAX32) || err > 0);
longstore(buffer, (int32) data);
break;
}
case MYSQL_TYPE_LONGLONG:
{
longlong data= my_strtoll10(value, &endptr, &err);
*param->error= param->is_unsigned ? err != 0 :
(err > 0 || (err == 0 && data < 0));
longlongstore(buffer, data);
break;
}
case MYSQL_TYPE_FLOAT:
{
double data= my_strntod(&my_charset_latin1, value, length, &endptr, &err);
float fdata= (float) data;
*param->error= (fdata != data) | test(err);
floatstore(buffer, fdata);
break;
}
case MYSQL_TYPE_DOUBLE:
{
double data= my_strntod(&my_charset_latin1, value, length, &endptr, &err);
*param->error= test(err);
doublestore(buffer, data);
break;
}
case MYSQL_TYPE_TIME:
{
MYSQL_TIME *tm= (MYSQL_TIME *)buffer;
str_to_time(value, length, tm, &err);
*param->error= test(err);
break;
}
case MYSQL_TYPE_DATE:
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
{
MYSQL_TIME *tm= (MYSQL_TIME *)buffer;
(void) str_to_datetime(value, length, tm, TIME_FUZZY_DATE, &err);
*param->error= test(err) && (param->buffer_type == MYSQL_TYPE_DATE &&
tm->time_type != MYSQL_TIMESTAMP_DATE);
break;
}
case MYSQL_TYPE_TINY_BLOB:
case MYSQL_TYPE_MEDIUM_BLOB:
case MYSQL_TYPE_LONG_BLOB:
case MYSQL_TYPE_BLOB:
case MYSQL_TYPE_DECIMAL:
case MYSQL_TYPE_NEWDECIMAL:
default:
{
/*
Copy column data to the buffer taking into account offset,
data length and buffer length.
*/
char *start= value + param->offset;
char *end= value + length;
ulong copy_length;
if (start < end)
{
copy_length= end - start;
/* We've got some data beyond offset: copy up to buffer_length bytes */
if (param->buffer_length)
memcpy(buffer, start, min(copy_length, param->buffer_length));
}
else
copy_length= 0;
if (copy_length < param->buffer_length)
buffer[copy_length]= '\0';
*param->error= copy_length > param->buffer_length;
/*
param->length will always contain length of entire column;
number of copied bytes may be way different:
*/
*param->length= length;
break;
}
}
}
/*
Convert integer value to client buffer of any type.
SYNOPSIS
fetch_long_with_conversion()
param output buffer descriptor
field column metadata
value column data
*/
static void fetch_long_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
longlong value, my_bool is_unsigned)
{
char *buffer= (char *)param->buffer;
switch (param->buffer_type) {
case MYSQL_TYPE_NULL: /* do nothing */
break;
case MYSQL_TYPE_TINY:
*param->error= IS_TRUNCATED(value, param->is_unsigned,
INT_MIN8, INT_MAX8, UINT_MAX8);
*(uchar *)param->buffer= (uchar) value;
break;
case MYSQL_TYPE_SHORT:
*param->error= IS_TRUNCATED(value, param->is_unsigned,
INT_MIN16, INT_MAX16, UINT_MAX16);
shortstore(buffer, (short) value);
break;
case MYSQL_TYPE_LONG:
*param->error= IS_TRUNCATED(value, param->is_unsigned,
INT_MIN32, INT_MAX32, UINT_MAX32);
longstore(buffer, (int32) value);
break;
case MYSQL_TYPE_LONGLONG:
longlongstore(buffer, value);
*param->error= param->is_unsigned != is_unsigned && value < 0;
break;
case MYSQL_TYPE_FLOAT:
{
/*
We need to store data in the buffer before the truncation check to
workaround Intel FPU executive precision feature.
(See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323 for details)
AFAIU it does not guarantee to work.
*/
float data;
if (is_unsigned)
data= (float) ulonglong2double(value);
else
data= (float) value;
floatstore(buffer, data);
*param->error= is_unsigned ?
((ulonglong) value) != ((ulonglong) (*(float*) buffer)) :
((longlong) value) != ((longlong) (*(float*) buffer));
break;
}
case MYSQL_TYPE_DOUBLE:
{
double data;
if (is_unsigned)
data= ulonglong2double(value);
else
data= (double)value;
doublestore(buffer, data);
*param->error= is_unsigned ?
((ulonglong) value) != ((ulonglong) (*(double*) buffer)) :
((longlong) value) != ((longlong) (*(double*) buffer));
break;
}
case MYSQL_TYPE_TIME:
case MYSQL_TYPE_DATE:
case MYSQL_TYPE_TIMESTAMP:
case MYSQL_TYPE_DATETIME:
{
int error;
value= number_to_datetime(value, (MYSQL_TIME *) buffer, TIME_FUZZY_DATE,
&error);
*param->error= test(error);
break;
}
default:
{
char buff[22]; /* Enough for longlong */
char *end= longlong10_to_str(value, buff, is_unsigned ? 10: -10);
/* Resort to string conversion which supports all typecodes */
uint length= (uint) (end-buff);
if (field->flags & ZEROFILL_FLAG && length < field->length &&
field->length < 21)
{
bmove_upp((char*) buff+field->length,buff+length, length);
bfill((char*) buff, field->length - length,'0');
length= field->length;
}
fetch_string_with_conversion(param, buff, length);
break;
}
}
}
/*
Convert double/float column to supplied buffer of any type.
SYNOPSIS
fetch_float_with_conversion()
param output buffer descriptor
field column metadata
value column data
width default number of significant digits used when converting
float/double to string
*/
static void fetch_float_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
double value, int width)
{
char *buffer= (char *)param->buffer;
double val64 = (value < 0 ? -floor(-value) : floor(value));
switch (param->buffer_type) {
case MYSQL_TYPE_NULL: /* do nothing */
break;
case MYSQL_TYPE_TINY:
/*
We need to _store_ data in the buffer before the truncation check to
workaround Intel FPU executive precision feature.
(See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323 for details)
Sic: AFAIU it does not guarantee to work.
*/
if (param->is_unsigned)
*buffer= (uint8) value;
else
*buffer= (int8) value;
*param->error= val64 != (param->is_unsigned ? (double)((uint8) *buffer) :
(double)((int8) *buffer));
break;
case MYSQL_TYPE_SHORT:
if (param->is_unsigned)
{
ushort data= (ushort) value;
shortstore(buffer, data);
}
else
{
short data= (short) value;
shortstore(buffer, data);
}
*param->error= val64 != (param->is_unsigned ? (double) (*(ushort*) buffer):
(double) (*(short*) buffer));
break;
case MYSQL_TYPE_LONG:
if (param->is_unsigned)
{
uint32 data= (uint32) value;
longstore(buffer, data);
}
else
{
int32 data= (int32) value;
longstore(buffer, data);
}
*param->error= val64 != (param->is_unsigned ? (double) (*(uint32*) buffer):
(double) (*(int32*) buffer));
break;
case MYSQL_TYPE_LONGLONG:
if (param->is_unsigned)
{
ulonglong data= (ulonglong) value;
longlongstore(buffer, data);
}
else
{
longlong data= (longlong) value;
longlongstore(buffer, data);
}
*param->error= val64 != (param->is_unsigned ?
ulonglong2double(*(ulonglong*) buffer) :
(double) (*(longlong*) buffer));
break;
case MYSQL_TYPE_FLOAT:
{
float data= (float) value;
floatstore(buffer, data);
*param->error= (*(float*) buffer) != value;
break;
}
case MYSQL_TYPE_DOUBLE:
{
doublestore(buffer, value);
break;
}
default:
{
/*
Resort to fetch_string_with_conversion: this should handle
floating point -> string conversion nicely, honor all typecodes
and param->offset possibly set in mysql_stmt_fetch_column
*/
char buff[MAX_DOUBLE_STRING_REP_LENGTH];
char *end;
/* TODO: move this to a header shared between client and server. */
#define NOT_FIXED_DEC 31
if (field->decimals >= NOT_FIXED_DEC)
#undef NOT_FIXED_DEC
{
/*
The 14 below is to ensure that the server and client has the same
precisions. This will ensure that on the same machine you get the
same value as a string independent of the protocol you use.
*/
sprintf(buff, "%-*.*g", (int) min(sizeof(buff)-1,
param->buffer_length),
min(14,width), value);
end= strcend(buff, ' ');
*end= 0;
}
else
{
sprintf(buff, "%.*f", (int) field->decimals, value);
end= strend(buff);
}
fetch_string_with_conversion(param, buff, (uint) (end - buff));
break;
}
}
}
/*
Fetch time/date/datetime to supplied buffer of any type
SYNOPSIS
param output buffer descriptor
time column data
*/
static void fetch_datetime_with_conversion(MYSQL_BIND *param,
MYSQL_FIELD *field,
MYSQL_TIME *time)
{
switch (param->buffer_type) {
case MYSQL_TYPE_NULL: /* do nothing */
break;
case MYSQL_TYPE_DATE:
*(MYSQL_TIME *)(param->buffer)= *time;
*param->error= time->time_type != MYSQL_TIMESTAMP_DATE;
break;
case MYSQL_TYPE_TIME:
*(MYSQL_TIME *)(param->buffer)= *time;
*param->error= time->time_type != MYSQL_TIMESTAMP_TIME;
break;
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
*(MYSQL_TIME *)(param->buffer)= *time;
/* No error: time and date are compatible with datetime */
break;
case MYSQL_TYPE_YEAR:
shortstore(param->buffer, time->year);
*param->error= 1;
break;
case MYSQL_TYPE_FLOAT:
case MYSQL_TYPE_DOUBLE:
{
ulonglong value= TIME_to_ulonglong(time);
fetch_float_with_conversion(param, field,
ulonglong2double(value), DBL_DIG);
break;
}
case MYSQL_TYPE_TINY:
case MYSQL_TYPE_SHORT:
case MYSQL_TYPE_INT24:
case MYSQL_TYPE_LONG:
case MYSQL_TYPE_LONGLONG:
{
longlong value= (longlong) TIME_to_ulonglong(time);
fetch_long_with_conversion(param, field, value, TRUE);
break;
}
default:
{
/*
Convert time value to string and delegate the rest to
fetch_string_with_conversion:
*/
char buff[MAX_DATE_STRING_REP_LENGTH];
uint length= my_TIME_to_str(time, buff);
/* Resort to string conversion */
fetch_string_with_conversion(param, (char *)buff, length);
break;
}
}
}
/*
Fetch and convert result set column to output buffer.
SYNOPSIS
fetch_result_with_conversion()
param output buffer descriptor
field column metadata
row points to a column of result set tuple in binary format
DESCRIPTION
This is a fallback implementation of column fetch used
if column and output buffer types do not match.
Increases tuple pointer to point at the next column within the
tuple.
*/
static void fetch_result_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
uchar **row)
{
enum enum_field_types field_type= field->type;
uint field_is_unsigned= field->flags & UNSIGNED_FLAG;
switch (field_type) {
case MYSQL_TYPE_TINY:
{
uchar value= **row;
/* sic: we need to cast to 'signed char' as 'char' may be unsigned */
longlong data= field_is_unsigned ? (longlong) value :
(longlong) (signed char) value;
fetch_long_with_conversion(param, field, data, 0);
*row+= 1;
break;
}
case MYSQL_TYPE_SHORT:
case MYSQL_TYPE_YEAR:
{
short value= sint2korr(*row);
longlong data= field_is_unsigned ? (longlong) (unsigned short) value :
(longlong) value;
fetch_long_with_conversion(param, field, data, 0);
*row+= 2;
break;
}
case MYSQL_TYPE_INT24: /* mediumint is sent as 4 bytes int */
case MYSQL_TYPE_LONG:
{
int32 value= sint4korr(*row);
longlong data= field_is_unsigned ? (longlong) (uint32) value :
(longlong) value;
fetch_long_with_conversion(param, field, data, 0);
*row+= 4;
break;
}
case MYSQL_TYPE_LONGLONG:
{
longlong value= (longlong)sint8korr(*row);
fetch_long_with_conversion(param, field, value,
field->flags & UNSIGNED_FLAG);
*row+= 8;
break;
}
case MYSQL_TYPE_FLOAT:
{
float value;
float4get(value,*row);
fetch_float_with_conversion(param, field, value, FLT_DIG);
*row+= 4;
break;
}
case MYSQL_TYPE_DOUBLE:
{
double value;
float8get(value,*row);
fetch_float_with_conversion(param, field, value, DBL_DIG);
*row+= 8;
break;
}
case MYSQL_TYPE_DATE:
{
MYSQL_TIME tm;
read_binary_date(&tm, row);
fetch_datetime_with_conversion(param, field, &tm);
break;
}
case MYSQL_TYPE_TIME:
{
MYSQL_TIME tm;
read_binary_time(&tm, row);
fetch_datetime_with_conversion(param, field, &tm);
break;
}
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
{
MYSQL_TIME tm;
read_binary_datetime(&tm, row);
fetch_datetime_with_conversion(param, field, &tm);
break;
}
default:
{
ulong length= net_field_length(row);
fetch_string_with_conversion(param, (char*) *row, length);
*row+= length;
break;
}
}
}
/*
Functions to fetch data to application buffers without conversion.
All functions have the following characteristics:
SYNOPSIS
fetch_result_xxx()
param MySQL bind param
pos Row value
DESCRIPTION
These are no-conversion functions, used in binary protocol to store
rows in application buffers. A function used only if type of binary data
is compatible with type of application buffer.
RETURN
none
*/
static void fetch_result_tinyint(MYSQL_BIND *param, MYSQL_FIELD *field,
uchar **row)
{
my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
uchar data= **row;
*(uchar *)param->buffer= data;
*param->error= param->is_unsigned != field_is_unsigned && data > INT_MAX8;
(*row)++;
}
static void fetch_result_short(MYSQL_BIND *param, MYSQL_FIELD *field,
uchar **row)
{
my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
ushort data= (ushort) sint2korr(*row);
shortstore(param->buffer, data);
*param->error= param->is_unsigned != field_is_unsigned && data > INT_MAX16;
*row+= 2;
}
static void fetch_result_int32(MYSQL_BIND *param,
MYSQL_FIELD *field __attribute__((unused)),
uchar **row)
{
my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
uint32 data= (uint32) sint4korr(*row);
longstore(param->buffer, data);
*param->error= param->is_unsigned != field_is_unsigned && data > INT_MAX32;
*row+= 4;
}
static void fetch_result_int64(MYSQL_BIND *param,
MYSQL_FIELD *field __attribute__((unused)),
uchar **row)
{
my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
ulonglong data= (ulonglong) sint8korr(*row);
*param->error= param->is_unsigned != field_is_unsigned && data > LONGLONG_MAX;
longlongstore(param->buffer, data);
*row+= 8;
}
static void fetch_result_float(MYSQL_BIND *param,
MYSQL_FIELD *field __attribute__((unused)),
uchar **row)
{
float value;
float4get(value,*row);
floatstore(param->buffer, value);
*row+= 4;
}
static void fetch_result_double(MYSQL_BIND *param,
MYSQL_FIELD *field __attribute__((unused)),
uchar **row)
{
double value;
float8get(value,*row);
doublestore(param->buffer, value);
*row+= 8;
}
static void fetch_result_time(MYSQL_BIND *param,
MYSQL_FIELD *field __attribute__((unused)),
uchar **row)
{
MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
read_binary_time(tm, row);
}
static void fetch_result_date(MYSQL_BIND *param,
MYSQL_FIELD *field __attribute__((unused)),
uchar **row)
{
MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
read_binary_date(tm, row);
}
static void fetch_result_datetime(MYSQL_BIND *param,
MYSQL_FIELD *field __attribute__((unused)),
uchar **row)
{
MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
read_binary_datetime(tm, row);
}
static void fetch_result_bin(MYSQL_BIND *param,
MYSQL_FIELD *field __attribute__((unused)),
uchar **row)
{
ulong length= net_field_length(row);
ulong copy_length= min(length, param->buffer_length);
memcpy(param->buffer, (char *)*row, copy_length);
*param->length= length;
*param->error= copy_length < length;
*row+= length;
}
static void fetch_result_str(MYSQL_BIND *param,
MYSQL_FIELD *field __attribute__((unused)),
uchar **row)
{
ulong length= net_field_length(row);
ulong copy_length= min(length, param->buffer_length);
memcpy(param->buffer, (char *)*row, copy_length);
/* Add an end null if there is room in the buffer */
if (copy_length != param->buffer_length)
((uchar *)param->buffer)[copy_length]= '\0';
*param->length= length; /* return total length */
*param->error= copy_length < length;
*row+= length;
}
/*
functions to calculate max lengths for strings during
mysql_stmt_store_result()
*/
static void skip_result_fixed(MYSQL_BIND *param,
MYSQL_FIELD *field __attribute__((unused)),
uchar **row)
{
(*row)+= param->pack_length;
}
static void skip_result_with_length(MYSQL_BIND *param __attribute__((unused)),
MYSQL_FIELD *field __attribute__((unused)),
uchar **row)
{
ulong length= net_field_length(row);
(*row)+= length;
}
static void skip_result_string(MYSQL_BIND *param __attribute__((unused)),
MYSQL_FIELD *field,
uchar **row)
{
ulong length= net_field_length(row);
(*row)+= length;
if (field->max_length < length)
field->max_length= length;
}
/*
Check that two field types are binary compatible i. e.
have equal representation in the binary protocol and
require client-side buffers of the same type.
SYNOPSIS
is_binary_compatible()
type1 parameter type supplied by user
type2 field type, obtained from result set metadata
RETURN
TRUE or FALSE
*/
static my_bool is_binary_compatible(enum enum_field_types type1,
enum enum_field_types type2)
{
static const enum enum_field_types
range1[]= { MYSQL_TYPE_SHORT, MYSQL_TYPE_YEAR, MYSQL_TYPE_NULL },
range2[]= { MYSQL_TYPE_INT24, MYSQL_TYPE_LONG, MYSQL_TYPE_NULL },
range3[]= { MYSQL_TYPE_DATETIME, MYSQL_TYPE_TIMESTAMP, MYSQL_TYPE_NULL },
range4[]= { MYSQL_TYPE_ENUM, MYSQL_TYPE_SET, MYSQL_TYPE_TINY_BLOB,
MYSQL_TYPE_MEDIUM_BLOB, MYSQL_TYPE_LONG_BLOB, MYSQL_TYPE_BLOB,
MYSQL_TYPE_VAR_STRING, MYSQL_TYPE_STRING, MYSQL_TYPE_GEOMETRY,
MYSQL_TYPE_DECIMAL, MYSQL_TYPE_NULL };
static const enum enum_field_types
*range_list[]= { range1, range2, range3, range4 },
**range_list_end= range_list + sizeof(range_list)/sizeof(*range_list);
const enum enum_field_types **range, *type;
if (type1 == type2)
return TRUE;
for (range= range_list; range != range_list_end; ++range)
{
/* check that both type1 and type2 are in the same range */
bool type1_found= FALSE, type2_found= FALSE;
for (type= *range; *type != MYSQL_TYPE_NULL; type++)
{
type1_found|= type1 == *type;
type2_found|= type2 == *type;
}
if (type1_found || type2_found)
return type1_found && type2_found;
}
return FALSE;
}
/*
Setup a fetch function for one column of a result set.
SYNOPSIS
setup_one_fetch_function()
param output buffer descriptor
field column descriptor
DESCRIPTION
When user binds result set buffers or when result set
metadata is changed, we need to setup fetch (and possibly
conversion) functions for all columns of the result set.
In addition to that here we set up skip_result function, used
to update result set metadata in case when
STMT_ATTR_UPDATE_MAX_LENGTH attribute is set.
Notice that while fetch_result is chosen depending on both
field->type and param->type, skip_result depends on field->type
only.
RETURN
TRUE fetch function for this typecode was not found (typecode
is not supported by the client library)
FALSE success
*/
static my_bool setup_one_fetch_function(MYSQL_BIND *param, MYSQL_FIELD *field)
{
/* Setup data copy functions for the different supported types */
switch (param->buffer_type) {
case MYSQL_TYPE_NULL: /* for dummy binds */
/*
It's not binary compatible with anything the server can return:
no need to setup fetch_result, as it'll be reset anyway
*/
*param->length= 0;
break;
case MYSQL_TYPE_TINY:
param->fetch_result= fetch_result_tinyint;
*param->length= 1;
break;
case MYSQL_TYPE_SHORT:
case MYSQL_TYPE_YEAR:
param->fetch_result= fetch_result_short;
*param->length= 2;
break;
case MYSQL_TYPE_INT24:
case MYSQL_TYPE_LONG:
param->fetch_result= fetch_result_int32;
*param->length= 4;
break;
case MYSQL_TYPE_LONGLONG:
param->fetch_result= fetch_result_int64;
*param->length= 8;
break;
case MYSQL_TYPE_FLOAT:
param->fetch_result= fetch_result_float;
*param->length= 4;
break;
case MYSQL_TYPE_DOUBLE:
param->fetch_result= fetch_result_double;
*param->length= 8;
break;
case MYSQL_TYPE_TIME:
param->fetch_result= fetch_result_time;
*param->length= sizeof(MYSQL_TIME);
break;
case MYSQL_TYPE_DATE:
param->fetch_result= fetch_result_date;
*param->length= sizeof(MYSQL_TIME);
break;
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
param->fetch_result= fetch_result_datetime;
*param->length= sizeof(MYSQL_TIME);
break;
case MYSQL_TYPE_TINY_BLOB:
case MYSQL_TYPE_MEDIUM_BLOB:
case MYSQL_TYPE_LONG_BLOB:
case MYSQL_TYPE_BLOB:
case MYSQL_TYPE_BIT:
DBUG_ASSERT(param->buffer_length != 0);
param->fetch_result= fetch_result_bin;
break;
case MYSQL_TYPE_VAR_STRING:
case MYSQL_TYPE_STRING:
case MYSQL_TYPE_DECIMAL:
case MYSQL_TYPE_NEWDECIMAL:
DBUG_ASSERT(param->buffer_length != 0);
param->fetch_result= fetch_result_str;
break;
default:
return TRUE;
}
if (! is_binary_compatible(param->buffer_type, field->type))
param->fetch_result= fetch_result_with_conversion;
/* Setup skip_result functions (to calculate max_length) */
param->skip_result= skip_result_fixed;
switch (field->type) {
case MYSQL_TYPE_NULL: /* for dummy binds */
param->pack_length= 0;
field->max_length= 0;
break;
case MYSQL_TYPE_TINY:
param->pack_length= 1;
field->max_length= 4; /* as in '-127' */
break;
case MYSQL_TYPE_YEAR:
case MYSQL_TYPE_SHORT:
param->pack_length= 2;
field->max_length= 6; /* as in '-32767' */
break;
case MYSQL_TYPE_INT24:
field->max_length= 9; /* as in '16777216' or in '-8388607' */
param->pack_length= 4;
break;
case MYSQL_TYPE_LONG:
field->max_length= 11; /* '-2147483647' */
param->pack_length= 4;
break;
case MYSQL_TYPE_LONGLONG:
field->max_length= 21; /* '18446744073709551616' */
param->pack_length= 8;
break;
case MYSQL_TYPE_FLOAT:
param->pack_length= 4;
field->max_length= MAX_DOUBLE_STRING_REP_LENGTH;
break;
case MYSQL_TYPE_DOUBLE:
param->pack_length= 8;
field->max_length= MAX_DOUBLE_STRING_REP_LENGTH;
break;
case MYSQL_TYPE_TIME:
field->max_length= 15; /* 19:23:48.123456 */
param->skip_result= skip_result_with_length;
case MYSQL_TYPE_DATE:
field->max_length= 10; /* 2003-11-11 */
param->skip_result= skip_result_with_length;
break;
break;
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
param->skip_result= skip_result_with_length;
field->max_length= MAX_DATE_STRING_REP_LENGTH;
break;
case MYSQL_TYPE_DECIMAL:
case MYSQL_TYPE_NEWDECIMAL:
case MYSQL_TYPE_ENUM:
case MYSQL_TYPE_SET:
case MYSQL_TYPE_GEOMETRY:
case MYSQL_TYPE_TINY_BLOB:
case MYSQL_TYPE_MEDIUM_BLOB:
case MYSQL_TYPE_LONG_BLOB:
case MYSQL_TYPE_BLOB:
case MYSQL_TYPE_VAR_STRING:
case MYSQL_TYPE_STRING:
case MYSQL_TYPE_BIT:
param->skip_result= skip_result_string;
break;
default:
return TRUE;
}
return FALSE;
}
/*
Setup the bind buffers for resultset processing
*/
my_bool STDCALL mysql_stmt_bind_result(MYSQL_STMT *stmt, MYSQL_BIND *bind)
{
MYSQL_BIND *param, *end;
MYSQL_FIELD *field;
ulong bind_count= stmt->field_count;
uint param_count= 0;
DBUG_ENTER("mysql_stmt_bind_result");
DBUG_PRINT("enter",("field_count: %d", bind_count));
if (!bind_count)
{
int errorcode= (int) stmt->state < (int) MYSQL_STMT_PREPARE_DONE ?
CR_NO_PREPARE_STMT : CR_NO_STMT_METADATA;
set_stmt_error(stmt, errorcode, unknown_sqlstate);
DBUG_RETURN(1);
}
/*
We only need to check that stmt->field_count - if it is not null
stmt->bind was initialized in mysql_stmt_prepare
stmt->bind overlaps with bind if mysql_stmt_bind_param
is called from mysql_stmt_store_result.
*/
if (stmt->bind != bind)
memcpy((char*) stmt->bind, (char*) bind, sizeof(MYSQL_BIND) * bind_count);
for (param= stmt->bind, end= param + bind_count, field= stmt->fields ;
param < end ;
param++, field++)
{
DBUG_PRINT("info",("buffer_type: %u field_type: %u",
(uint) param->buffer_type, (uint) field->type));
/*
Set param->is_null to point to a dummy variable if it's not set.
This is to make the execute code easier
*/
if (!param->is_null)
param->is_null= &param->is_null_value;
if (!param->length)
param->length= &param->length_value;
if (!param->error)
param->error= &param->error_value;
param->param_number= param_count++;
param->offset= 0;
if (setup_one_fetch_function(param, field))
{
strmov(stmt->sqlstate, unknown_sqlstate);
sprintf(stmt->last_error,
ER(stmt->last_errno= CR_UNSUPPORTED_PARAM_TYPE),
field->type, param_count);
DBUG_RETURN(1);
}
}
stmt->bind_result_done= BIND_RESULT_DONE;
if (stmt->mysql->options.report_data_truncation)
stmt->bind_result_done|= REPORT_DATA_TRUNCATION;
DBUG_RETURN(0);
}
/*
Fetch row data to bind buffers
*/
static int stmt_fetch_row(MYSQL_STMT *stmt, uchar *row)
{
MYSQL_BIND *bind, *end;
MYSQL_FIELD *field;
uchar *null_ptr, bit;
int truncation_count= 0;
/*
Precondition: if stmt->field_count is zero or row is NULL, read_row_*
function must return no data.
*/
DBUG_ASSERT(stmt->field_count);
DBUG_ASSERT(row);
if (!stmt->bind_result_done)
{
/* If output parameters were not bound we should just return success */
return 0;
}
null_ptr= row;
row+= (stmt->field_count+9)/8; /* skip null bits */
bit= 4; /* first 2 bits are reserved */
/* Copy complete row to application buffers */
for (bind= stmt->bind, end= bind + stmt->field_count, field= stmt->fields ;
bind < end ;
bind++, field++)
{
*bind->error= 0;
if (*null_ptr & bit)
{
/*
We should set both row_ptr and is_null to be able to see
nulls in mysql_stmt_fetch_column. This is because is_null may point
to user data which can be overwritten between mysql_stmt_fetch and
mysql_stmt_fetch_column, and in this case nullness of column will be
lost. See mysql_stmt_fetch_column for details.
*/
bind->row_ptr= NULL;
*bind->is_null= 1;
}
else
{
*bind->is_null= 0;
bind->row_ptr= row;
(*bind->fetch_result)(bind, field, &row);
truncation_count+= *bind->error;
}
if (!((bit<<=1) & 255))
{
bit= 1; /* To next byte */
null_ptr++;
}
}
if (truncation_count && (stmt->bind_result_done & REPORT_DATA_TRUNCATION))
return MYSQL_DATA_TRUNCATED;
return 0;
}
int cli_unbuffered_fetch(MYSQL *mysql, char **row)
{
if (packet_error == net_safe_read(mysql))
return 1;
*row= ((mysql->net.read_pos[0] == 254) ? NULL :
(char*) (mysql->net.read_pos+1));
return 0;
}
/*
Fetch and return row data to bound buffers, if any
*/
int STDCALL mysql_stmt_fetch(MYSQL_STMT *stmt)
{
int rc;
uchar *row;
DBUG_ENTER("mysql_stmt_fetch");
if ((rc= (*stmt->read_row_func)(stmt, &row)) ||
((rc= stmt_fetch_row(stmt, row)) && rc != MYSQL_DATA_TRUNCATED))
{
stmt->state= MYSQL_STMT_PREPARE_DONE; /* XXX: this is buggy */
stmt->read_row_func= (rc == MYSQL_NO_DATA) ?
stmt_read_row_no_data : stmt_read_row_no_result_set;
}
else
{
/* This is to know in mysql_stmt_fetch_column that data was fetched */
stmt->state= MYSQL_STMT_FETCH_DONE;
}
DBUG_RETURN(rc);
}
/*
Fetch data for one specified column data
SYNOPSIS
mysql_stmt_fetch_column()
stmt Prepared statement handler
bind Where data should be placed. Should be filled in as
when calling mysql_stmt_bind_result()
column Column to fetch (first column is 0)
ulong offset Offset in result data (to fetch blob in pieces)
This is normally 0
RETURN
0 ok
1 error
*/
int STDCALL mysql_stmt_fetch_column(MYSQL_STMT *stmt, MYSQL_BIND *bind,
uint column, ulong offset)
{
MYSQL_BIND *param= stmt->bind+column;
DBUG_ENTER("mysql_stmt_fetch_column");
if ((int) stmt->state < (int) MYSQL_STMT_FETCH_DONE)
{
set_stmt_error(stmt, CR_NO_DATA, unknown_sqlstate);
return 1;
}
if (column >= stmt->field_count)
{
set_stmt_error(stmt, CR_INVALID_PARAMETER_NO, unknown_sqlstate);
DBUG_RETURN(1);
}
if (!bind->error)
bind->error= &bind->error_value;
*bind->error= 0;
if (param->row_ptr)
{
MYSQL_FIELD *field= stmt->fields+column;
uchar *row= param->row_ptr;
bind->offset= offset;
if (bind->is_null)
*bind->is_null= 0;
if (bind->length) /* Set the length if non char/binary types */
*bind->length= *param->length;
else
bind->length= &param->length_value; /* Needed for fetch_result() */
fetch_result_with_conversion(bind, field, &row);
}
else
{
if (bind->is_null)
*bind->is_null= 1;
}
DBUG_RETURN(0);
}
/*
Read all rows of data from server (binary format)
*/
int cli_read_binary_rows(MYSQL_STMT *stmt)
{
ulong pkt_len;
uchar *cp;
MYSQL *mysql= stmt->mysql;
MYSQL_DATA *result= &stmt->result;
MYSQL_ROWS *cur, **prev_ptr= &result->data;
NET *net = &mysql->net;
DBUG_ENTER("cli_read_binary_rows");
mysql= mysql->last_used_con;
while ((pkt_len= net_safe_read(mysql)) != packet_error)
{
cp= net->read_pos;
if (cp[0] != 254 || pkt_len >= 8)
{
if (!(cur= (MYSQL_ROWS*) alloc_root(&result->alloc,
sizeof(MYSQL_ROWS) + pkt_len - 1)))
{
set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
goto err;
}
cur->data= (MYSQL_ROW) (cur+1);
*prev_ptr= cur;
prev_ptr= &cur->next;
memcpy((char *) cur->data, (char *) cp+1, pkt_len-1);
cur->length= pkt_len; /* To allow us to do sanity checks */
result->rows++;
}
else
{
/* end of data */
*prev_ptr= 0;
mysql->warning_count= uint2korr(cp+1);
mysql->server_status= uint2korr(cp+3);
DBUG_PRINT("info",("status: %u warning_count: %u",
mysql->server_status, mysql->warning_count));
DBUG_RETURN(0);
}
}
set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
err:
DBUG_RETURN(1);
}
/*
Update meta data for statement
SYNOPSIS
stmt_update_metadata()
stmt Statement handler
row Binary data
NOTES
Only updates MYSQL_FIELD->max_length for strings
*/
static void stmt_update_metadata(MYSQL_STMT *stmt, MYSQL_ROWS *data)
{
MYSQL_BIND *bind, *end;
MYSQL_FIELD *field;
uchar *null_ptr, bit;
uchar *row= (uchar*) data->data;
#ifndef DBUG_OFF
uchar *row_end= row + data->length;
#endif
null_ptr= row;
row+= (stmt->field_count+9)/8; /* skip null bits */
bit= 4; /* first 2 bits are reserved */
/* Go through all fields and calculate metadata */
for (bind= stmt->bind, end= bind + stmt->field_count, field= stmt->fields ;
bind < end ;
bind++, field++)
{
if (!(*null_ptr & bit))
(*bind->skip_result)(bind, field, &row);
DBUG_ASSERT(row <= row_end);
if (!((bit<<=1) & 255))
{
bit= 1; /* To next byte */
null_ptr++;
}
}
}
/*
Store or buffer the binary results to stmt
*/
int STDCALL mysql_stmt_store_result(MYSQL_STMT *stmt)
{
MYSQL *mysql= stmt->mysql;
MYSQL_DATA *result= &stmt->result;
DBUG_ENTER("mysql_stmt_store_result");
mysql= mysql->last_used_con;
if (!stmt->field_count)
DBUG_RETURN(0);
if ((int) stmt->state < (int) MYSQL_STMT_EXECUTE_DONE ||
mysql->status != MYSQL_STATUS_GET_RESULT)
{
set_stmt_error(stmt, CR_COMMANDS_OUT_OF_SYNC, unknown_sqlstate);
DBUG_RETURN(1);
}
if (result->data)
{
free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
result->data= NULL;
result->rows= 0;
stmt->data_cursor= NULL;
}
if (stmt->update_max_length && !stmt->bind_result_done)
{
/*
We must initalize the bind structure to be able to calculate
max_length
*/
MYSQL_BIND *bind, *end;
MYSQL_FIELD *field;
bzero((char*) stmt->bind, sizeof(*stmt->bind)* stmt->field_count);
for (bind= stmt->bind, end= bind + stmt->field_count, field= stmt->fields;
bind < end ;
bind++, field++)
{
bind->buffer_type= MYSQL_TYPE_NULL;
bind->buffer_length=1;
}
if (mysql_stmt_bind_result(stmt, stmt->bind))
DBUG_RETURN(1);
stmt->bind_result_done= 0; /* No normal bind done */
}
if ((*mysql->methods->read_binary_rows)(stmt))
{
free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
result->data= NULL;
result->rows= 0;
mysql->status= MYSQL_STATUS_READY;
DBUG_RETURN(1);
}
if (stmt->update_max_length)
{
MYSQL_ROWS *cur= result->data;
for(; cur; cur=cur->next)
stmt_update_metadata(stmt, cur);
}
stmt->data_cursor= result->data;
mysql->affected_rows= stmt->affected_rows= result->rows;
stmt->read_row_func= stmt_read_row_buffered;
mysql->unbuffered_fetch_owner= 0; /* set in stmt_execute */
mysql->status= MYSQL_STATUS_READY; /* server is ready */
DBUG_RETURN(0); /* Data buffered, must be fetched with mysql_stmt_fetch() */
}
/*
Seek to desired row in the statement result set
*/
MYSQL_ROW_OFFSET STDCALL
mysql_stmt_row_seek(MYSQL_STMT *stmt, MYSQL_ROW_OFFSET row)
{
MYSQL_ROW_OFFSET offset= stmt->data_cursor;
DBUG_ENTER("mysql_stmt_row_seek");
stmt->data_cursor= row;
DBUG_RETURN(offset);
}
/*
Return the current statement row cursor position
*/
MYSQL_ROW_OFFSET STDCALL
mysql_stmt_row_tell(MYSQL_STMT *stmt)
{
DBUG_ENTER("mysql_stmt_row_tell");
DBUG_RETURN(stmt->data_cursor);
}
/*
Move the stmt result set data cursor to specified row
*/
void STDCALL
mysql_stmt_data_seek(MYSQL_STMT *stmt, my_ulonglong row)
{
MYSQL_ROWS *tmp= stmt->result.data;
DBUG_ENTER("mysql_stmt_data_seek");
DBUG_PRINT("enter",("row id to seek: %ld",(long) row));
for (; tmp && row; --row, tmp= tmp->next)
;
stmt->data_cursor= tmp;
if (!row && tmp)
{
/* Rewind the counter */
stmt->read_row_func= stmt_read_row_buffered;
stmt->state= MYSQL_STMT_EXECUTE_DONE;
}
DBUG_VOID_RETURN;
}
/*
Return total rows the current statement result set
*/
my_ulonglong STDCALL mysql_stmt_num_rows(MYSQL_STMT *stmt)
{
DBUG_ENTER("mysql_stmt_num_rows");
DBUG_RETURN(stmt->result.rows);
}
/*
Free the client side memory buffers, reset long data state
on client if necessary, and reset the server side statement if
this has been requested.
*/
static my_bool reset_stmt_handle(MYSQL_STMT *stmt, uint flags)
{
/* If statement hasn't been prepared there is nothing to reset */
if ((int) stmt->state > (int) MYSQL_STMT_INIT_DONE)
{
MYSQL *mysql= stmt->mysql;
MYSQL_DATA *result= &stmt->result;
/*
Reset stored result set if so was requested or it's a part
of cursor fetch.
*/
if (result->data && (flags & RESET_STORE_RESULT))
{
/* Result buffered */
free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
result->data= NULL;
result->rows= 0;
stmt->data_cursor= NULL;
}
if (flags & RESET_LONG_DATA)
{
MYSQL_BIND *param= stmt->params, *param_end= param + stmt->param_count;
/* Clear long_data_used flags */
for (; param < param_end; param++)
param->long_data_used= 0;
}
stmt->read_row_func= stmt_read_row_no_result_set;
if (mysql)
{
if ((int) stmt->state > (int) MYSQL_STMT_PREPARE_DONE)
{
if (mysql->unbuffered_fetch_owner == &stmt->unbuffered_fetch_cancelled)
mysql->unbuffered_fetch_owner= 0;
if (stmt->field_count && mysql->status != MYSQL_STATUS_READY)
{
/* There is a result set and it belongs to this statement */
(*mysql->methods->flush_use_result)(mysql);
if (mysql->unbuffered_fetch_owner)
*mysql->unbuffered_fetch_owner= TRUE;
mysql->status= MYSQL_STATUS_READY;
}
}
if (flags & RESET_SERVER_SIDE)
{
/*
Reset the server side statement and close the server side
cursor if it exists.
*/
char buff[MYSQL_STMT_HEADER]; /* packet header: 4 bytes for stmt id */
int4store(buff, stmt->stmt_id);
if ((*mysql->methods->advanced_command)(mysql, COM_STMT_RESET, buff,
sizeof(buff), 0, 0, 0))
{
set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
mysql->net.sqlstate);
stmt->state= MYSQL_STMT_INIT_DONE;
return 1;
}
stmt_clear_error(stmt);
}
}
stmt->state= MYSQL_STMT_PREPARE_DONE;
}
return 0;
}
my_bool STDCALL mysql_stmt_free_result(MYSQL_STMT *stmt)
{
DBUG_ENTER("mysql_stmt_free_result");
/* Free the client side and close the server side cursor if there is one */
DBUG_RETURN(reset_stmt_handle(stmt, RESET_LONG_DATA | RESET_STORE_RESULT));
}
/********************************************************************
statement error handling and close
*********************************************************************/
/*
Close the statement handle by freeing all alloced resources
SYNOPSIS
mysql_stmt_close()
stmt Statement handle
RETURN VALUES
0 ok
1 error
*/
my_bool STDCALL mysql_stmt_close(MYSQL_STMT *stmt)
{
MYSQL *mysql= stmt->mysql;
int rc= 0;
DBUG_ENTER("mysql_stmt_close");
free_root(&stmt->result.alloc, MYF(0));
free_root(&stmt->mem_root, MYF(0));
if (mysql)
{
mysql->stmts= list_delete(mysql->stmts, &stmt->list);
/*
Clear NET error state: if the following commands come through
successfully, connection will still be usable for other commands.
*/
net_clear_error(&mysql->net);
if ((int) stmt->state > (int) MYSQL_STMT_INIT_DONE)
{
char buff[MYSQL_STMT_HEADER]; /* 4 bytes - stmt id */
if (mysql->unbuffered_fetch_owner == &stmt->unbuffered_fetch_cancelled)
mysql->unbuffered_fetch_owner= 0;
if (mysql->status != MYSQL_STATUS_READY)
{
/*
Flush result set of the connection. If it does not belong
to this statement, set a warning.
*/
(*mysql->methods->flush_use_result)(mysql);
if (mysql->unbuffered_fetch_owner)
*mysql->unbuffered_fetch_owner= TRUE;
mysql->status= MYSQL_STATUS_READY;
}
int4store(buff, stmt->stmt_id);
if ((rc= simple_command(mysql, COM_STMT_CLOSE, buff, 4, 1)))
{
set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
mysql->net.sqlstate);
}
}
}
my_free((gptr) stmt, MYF(MY_WME));
DBUG_RETURN(test(rc));
}
/*
Reset the statement buffers in server
*/
my_bool STDCALL mysql_stmt_reset(MYSQL_STMT *stmt)
{
DBUG_ENTER("mysql_stmt_reset");
DBUG_ASSERT(stmt != 0);
/* Reset the client and server sides of the prepared statement */
DBUG_RETURN(reset_stmt_handle(stmt, RESET_SERVER_SIDE | RESET_LONG_DATA));
}
/*
Return statement error code
*/
uint STDCALL mysql_stmt_errno(MYSQL_STMT * stmt)
{
DBUG_ENTER("mysql_stmt_errno");
DBUG_RETURN(stmt->last_errno);
}
const char *STDCALL mysql_stmt_sqlstate(MYSQL_STMT * stmt)
{
DBUG_ENTER("mysql_stmt_sqlstate");
DBUG_RETURN(stmt->sqlstate);
}
/*
Return statement error message
*/
const char *STDCALL mysql_stmt_error(MYSQL_STMT * stmt)
{
DBUG_ENTER("mysql_stmt_error");
DBUG_RETURN(stmt->last_error);
}
/********************************************************************
Transactional APIs
*********************************************************************/
/*
Commit the current transaction
*/
my_bool STDCALL mysql_commit(MYSQL * mysql)
{
DBUG_ENTER("mysql_commit");
DBUG_RETURN((my_bool) mysql_real_query(mysql, "commit", 6));
}
/*
Rollback the current transaction
*/
my_bool STDCALL mysql_rollback(MYSQL * mysql)
{
DBUG_ENTER("mysql_rollback");
DBUG_RETURN((my_bool) mysql_real_query(mysql, "rollback", 8));
}
/*
Set autocommit to either true or false
*/
my_bool STDCALL mysql_autocommit(MYSQL * mysql, my_bool auto_mode)
{
DBUG_ENTER("mysql_autocommit");
DBUG_PRINT("enter", ("mode : %d", auto_mode));
DBUG_RETURN((my_bool) mysql_real_query(mysql, auto_mode ?
"set autocommit=1":"set autocommit=0",
16));
}
/********************************************************************
Multi query execution + SPs APIs
*********************************************************************/
/*
Returns true/false to indicate whether any more query results exist
to be read using mysql_next_result()
*/
my_bool STDCALL mysql_more_results(MYSQL *mysql)
{
my_bool res;
DBUG_ENTER("mysql_more_results");
res= ((mysql->last_used_con->server_status & SERVER_MORE_RESULTS_EXISTS) ?
1: 0);
DBUG_PRINT("exit",("More results exists ? %d", res));
DBUG_RETURN(res);
}
/*
Reads and returns the next query results
*/
int STDCALL mysql_next_result(MYSQL *mysql)
{
DBUG_ENTER("mysql_next_result");
if (mysql->status != MYSQL_STATUS_READY)
{
strmov(mysql->net.sqlstate, unknown_sqlstate);
strmov(mysql->net.last_error,
ER(mysql->net.last_errno=CR_COMMANDS_OUT_OF_SYNC));
DBUG_RETURN(1);
}
mysql->net.last_error[0]= 0;
mysql->net.last_errno= 0;
strmov(mysql->net.sqlstate, not_error_sqlstate);
mysql->affected_rows= ~(my_ulonglong) 0;
if (mysql->last_used_con->server_status & SERVER_MORE_RESULTS_EXISTS)
DBUG_RETURN((*mysql->methods->next_result)(mysql));
DBUG_RETURN(-1); /* No more results */
}
MYSQL_RES * STDCALL mysql_use_result(MYSQL *mysql)
{
return (*mysql->methods->use_result)(mysql);
}
my_bool STDCALL mysql_read_query_result(MYSQL *mysql)
{
return (*mysql->methods->read_query_result)(mysql);
}
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