DriverNotSpecifiedException example

  final protected static function openConnection($key, $target) {
    // If the requested database does not exist then it is an unrecoverable     // error.     if (!isset(self::$databaseInfo[$key])) {
      throw new ConnectionNotDefinedException('The specified database connection is not defined: ' . $key);
    }

    if (!self::$databaseInfo[$key][$target]['driver']) {
      throw new DriverNotSpecifiedException('Driver not specified for this database connection: ' . $key);
    }

    $driver_class = self::$databaseInfo[$key][$target]['namespace'] . '\\Connection';

    $client_connection = $driver_class::open(self::$databaseInfo[$key][$target]);
    $new_connection = new $driver_class($client_connection, self::$databaseInfo[$key][$target]);
    $new_connection->setTarget($target);
    $new_connection->setKey($key);

    // If we have any active logging objects for this connection key, we need     // to associate them with the connection we just opened.