(mysql.info) mysql-stmt-execute
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(mysql.info) mysql-stmt-error
(mysql.info) c-api-prepared-statement-functions
(mysql.info) mysql-stmt-fetch
22.2.7.10 `mysql_stmt_execute()'
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`int mysql_stmt_execute(MYSQL_STMT *stmt)'
*Description*
`mysql_stmt_execute()' executes the prepared query associated with the
statement handle. The currently bound parameter marker values are sent
to server during this call, and the server replaces the markers with
this newly supplied data.
If the statement is an `UPDATE', `DELETE', or `INSERT', the total
number of changed, deleted, or inserted rows can be found by calling
`mysql_stmt_affected_rows()'. If this is a statement such as `SELECT'
that generates a result set, you must call `mysql_stmt_fetch()' to
fetch the data prior to calling any other functions that result in query
processing. For more information on how to fetch the results, refer to
mysql-stmt-fetch.
For statements that generate a result set, you can request that
`mysql_stmt_execute()' open a cursor for the statement by calling
`mysql_stmt_attr_set()' before executing the statement. If you execute
a statement multiple times, `mysql_stmt_execute()' closes any open
cursor before opening a new one.
*Return Values*
Zero if execution was successful. Non-zero if an error occurred.
*Errors*
* `CR_COMMANDS_OUT_OF_SYNC'
Commands were executed in an improper order.
* `CR_OUT_OF_MEMORY'
Out of memory.
* `CR_SERVER_GONE_ERROR'
The MySQL server has gone away.
* `CR_SERVER_LOST'
The connection to the server was lost during the query.
* `CR_UNKNOWN_ERROR'
An unknown error occurred.
*Example*
The following example demonstrates how to create and populate a table
using `mysql_stmt_init()', `mysql_stmt_prepare()',
`mysql_stmt_param_count()', `mysql_stmt_bind_param()',
`mysql_stmt_execute()', and `mysql_stmt_affected_rows()'. The `mysql'
variable is assumed to be a valid connection handle.
#define STRING_SIZE 50
#define DROP_SAMPLE_TABLE "DROP TABLE IF EXISTS test_table"
#define CREATE_SAMPLE_TABLE "CREATE TABLE test_table(col1 INT,\
col2 VARCHAR(40),\
col3 SMALLINT,\
col4 TIMESTAMP)"
#define INSERT_SAMPLE "INSERT INTO test_table(col1,col2,col3) VALUES(?,?,?)"
MYSQL_STMT *stmt;
MYSQL_BIND bind[3];
my_ulonglong affected_rows;
int param_count;
short small_data;
int int_data;
char str_data[STRING_SIZE];
unsigned long str_length;
my_bool is_null;
if (mysql_query(mysql, DROP_SAMPLE_TABLE))
{
fprintf(stderr, " DROP TABLE failed\n");
fprintf(stderr, " %s\n", mysql_error(mysql));
exit(0);
}
if (mysql_query(mysql, CREATE_SAMPLE_TABLE))
{
fprintf(stderr, " CREATE TABLE failed\n");
fprintf(stderr, " %s\n", mysql_error(mysql));
exit(0);
}
/* Prepare an INSERT query with 3 parameters */
/* (the TIMESTAMP column is not named; the server */
/* sets it to the current date and time) */
stmt = mysql_stmt_init(mysql);
if (!stmt)
{
fprintf(stderr, " mysql_stmt_init(), out of memory\n");
exit(0);
}
if (mysql_stmt_prepare(stmt, INSERT_SAMPLE, strlen(INSERT_SAMPLE)))
{
fprintf(stderr, " mysql_stmt_prepare(), INSERT failed\n");
fprintf(stderr, " %s\n", mysql_stmt_error(stmt));
exit(0);
}
fprintf(stdout, " prepare, INSERT successful\n");
/* Get the parameter count from the statement */
param_count= mysql_stmt_param_count(stmt);
fprintf(stdout, " total parameters in INSERT: %d\n", param_count);
if (param_count != 3) /* validate parameter count */
{
fprintf(stderr, " invalid parameter count returned by MySQL\n");
exit(0);
}
/* Bind the data for all 3 parameters */
memset(bind, 0, sizeof(bind));
/* INTEGER PARAM */
/* This is a number type, so there is no need to specify buffer_length */
bind[0].buffer_type= MYSQL_TYPE_LONG;
bind[0].buffer= (char *)&int_data;
bind[0].is_null= 0;
bind[0].length= 0;
/* STRING PARAM */
bind[1].buffer_type= MYSQL_TYPE_STRING;
bind[1].buffer= (char *)str_data;
bind[1].buffer_length= STRING_SIZE;
bind[1].is_null= 0;
bind[1].length= &str_length;
/* SMALLINT PARAM */
bind[2].buffer_type= MYSQL_TYPE_SHORT;
bind[2].buffer= (char *)&small_data;
bind[2].is_null= &is_null;
bind[2].length= 0;
/* Bind the buffers */
if (mysql_stmt_bind_param(stmt, bind))
{
fprintf(stderr, " mysql_stmt_bind_param() failed\n");
fprintf(stderr, " %s\n", mysql_stmt_error(stmt));
exit(0);
}
/* Specify the data values for the first row */
int_data= 10; /* integer */
strncpy(str_data, "MySQL", STRING_SIZE); /* string */
str_length= strlen(str_data);
/* INSERT SMALLINT data as NULL */
is_null= 1;
/* Execute the INSERT statement - 1*/
if (mysql_stmt_execute(stmt))
{
fprintf(stderr, " mysql_stmt_execute(), 1 failed\n");
fprintf(stderr, " %s\n", mysql_stmt_error(stmt));
exit(0);
}
/* Get the total number of affected rows */
affected_rows= mysql_stmt_affected_rows(stmt);
fprintf(stdout, " total affected rows(insert 1): %lu\n",
(unsigned long) affected_rows);
if (affected_rows != 1) /* validate affected rows */
{
fprintf(stderr, " invalid affected rows by MySQL\n");
exit(0);
}
/* Specify data values for second row, then re-execute the statement */
int_data= 1000;
strncpy(str_data, "The most popular Open Source database", STRING_SIZE);
str_length= strlen(str_data);
small_data= 1000; /* smallint */
is_null= 0; /* reset */
/* Execute the INSERT statement - 2*/
if (mysql_stmt_execute(stmt))
{
fprintf(stderr, " mysql_stmt_execute, 2 failed\n");
fprintf(stderr, " %s\n", mysql_stmt_error(stmt));
exit(0);
}
/* Get the total rows affected */
affected_rows= mysql_stmt_affected_rows(stmt);
fprintf(stdout, " total affected rows(insert 2): %lu\n",
(unsigned long) affected_rows);
if (affected_rows != 1) /* validate affected rows */
{
fprintf(stderr, " invalid affected rows by MySQL\n");
exit(0);
}
/* Close the statement */
if (mysql_stmt_close(stmt))
{
fprintf(stderr, " failed while closing the statement\n");
fprintf(stderr, " %s\n", mysql_stmt_error(stmt));
exit(0);
}
* For complete examples on the use of prepared statement
functions, refer to the file `tests/mysql_client_test.c'. This file can
be obtained from a MySQL source distribution or from the BitKeeper
source repository.
Info Catalog
(mysql.info) mysql-stmt-error
(mysql.info) c-api-prepared-statement-functions
(mysql.info) mysql-stmt-fetch
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