mysql_change_user() - 0

 Changes the user and causes the database specified by
        db to become the default (current) database
        on the connection specified by mysql. In
        subsequent queries, this database is the default for table
        references that include no explicit database specifier.dbmysqlmysql_change_user() fails if the
        connected user cannot be authenticated or does not have
        permission to use the database. In this case, the user and
        database are not changed.mysql_change_user()mysql_change_user()Pass a db parameter of
        NULL if you do not want to have a default
        database.dbNULLThis function resets the session state as if one had done a new
        connect and reauthenticated. (See
        Section 25.8.16, “Controlling Automatic Reconnection Behavior”.) It always performs a
        ROLLBACK of
        any active transactions, closes and drops all temporary tables,
        and unlocks all locked tables. Session system variables are
        reset to the values of the corresponding global system
        variables. Prepared statements are released and
        HANDLER variables are closed.
        Locks acquired with GET_LOCK()
        are released. These effects occur even if the user did not
        change.Section 25.8.16, “Controlling Automatic Reconnection Behavior”ROLLBACKROLLBACKHANDLERHANDLERGET_LOCK()GET_LOCK()To reset the connection state in a more lightweight manner
        without changing the user, use
        mysql_reset_connection().mysql_reset_connection()mysql_reset_connection()

Syntax

my_bool mysql_change_user(MYSQL *mysql, const char
        *user, const char *password, const char *db)

Example

if (mysql_change_user(&mysql, "user", "password", "new_database"))
{
   fprintf(stderr, "Failed to change user.  Error: %s\n",
           mysql_error(&mysql));
}

Output / Return Value

 Zero for success. Nonzero if an error occurred.

Limitations

Alternatives / See Also

Reference