mysql_stmt_execute 执行成功，但是数据库中无数据

miweimihui 2012-07-26 08:45:26

#define STRING_SIZE 40

#define DROP_SAMPLE_TABLE "DROP TABLE IF EXISTS test_table"

#define CREATE_SAMPLE_TABLE "CREATE TABLE test_table(col1 INT, col2 INT)"

#define INSERT_SAMPLE "INSERT INTO test_table(col1,col2) VALUES(?,?)"

int main(){

MYSQL_STMT *stmt;

MYSQL_BIND bind[2];

my_ulonglong affected_rows;

int param_count;

/*short*/ int small_data;

int int_data=200;

char str_data[STRING_SIZE];

unsigned long str_length;

my_bool is_null;

MYSQL *mysql;

mysql = mysql_init(NULL);

mysql_real_connect(mysql, "localhost", "root", "123456", "testmm", 0, NULL, 0);

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 != 2) /* 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*/MYSQL_TYPE_LONG;

bind[1].buffer= (char *)&int_data;

bind[1].is_null= 0;

bind[1].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);

}

/* 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);

}

mysql_close(mysql);

}

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