mysql\_select\_db(3) MariaDB Connector/C mysql\_select\_db(3)

## [Name](#Name)

mysql\_select\_db - selects a database as default

## [Synopsis](#Synopsis)

```
#include <mysql.h>
int mysql_select_db(MYSQL * mysql,


                    const char * db);
    
```

## [Description](#Description)

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

## [Parameters](#Parameters)

•

mysql is a connection identifier, which was previously allocated by [**mysql\_init(3)**](/man/enterprise-packages/mariadb-13.0/mysql_init.3) and connected by [**mysql\_real\_connect(3)**](/man/enterprise-packages/mariadb-13.0/mysql_real_connect.3).

•

db - the default database name

## [Notes](#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)**](/man/enterprise-packages/mariadb-13.0/mariadb_get_infov.3) API function.

•

The default database can also be set by the db parameter in [**mysql\_real\_connect(3)**](/man/enterprise-packages/mariadb-13.0/mysql_real_connect.3).

## [Examples](#Examples)

## [SQL](#SQL)

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

## [MariadDB Connector/C](#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;
}
    
```

## [See also](#See_also)

[**mysql\_real\_connect(3)**](/man/enterprise-packages/mariadb-13.0/mysql_real_connect.3)

Version 3.4

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Document: mysql_select_db(3) from mariadb-13.0 13.0.2-r2 (Chainguard OS)