mysql_select_db - selects a database as default

Name Synopsis Description Parameters Notes Examples SQL MariadDB Connector/C See also

Name

mysql_select_db − selects a database as default

Synopsis

#include <mysql.h>

int mysql_select_db(MYSQL * mysql,
const char * db);

Description

Selects a database as default. Returns zero on success, non−zero on failure

Parameters

	•		mysql is a connection identifier, which was previously allocated by mysql_init(3) and connected by mysql_real_connect(3).
	•		db − the default database name

Notes

	•		To retrieve the name of the default database either execute the SQL command SELECT DATABASE() or retrieve the value via mariadb_get_infov(3) API function.
	•		The default database can also be set by the db parameter in mysql_real_connect(3).

Examples

SQL

# switch to default database test
USE test;
# check default database
SELECT DATABASE();
+−−−−−−−−−−−−+
| database() |
+−−−−−−−−−−−−+
| test |
+−−−−−−−−−−−−+

MariadDB Connector/C

static int set_default_db(MYSQL *mysql)
{
int rc;
char *default_db;

/* change default database to test */
rc= mysql_select_db(mysql, "test");
if (rc)
return rc; /* Error */

/* get the default database */
rc= mariadb_get_infov(mysql, MARIADB_CONNECTION_SCHEMA, &default_db);
if (rc)
return rc; /* Error */

if (strcmp("test", default_db) != NULL)
{
printf("Wrong default database\n");
return 1;
}
printf("Default database: %s", default_db);
return 0;
}