Opens a connection to the server specified by the given key and target.
$key: The database connection key, as specified in settings.php. The default is "default".
$target: The database target to open.
Drupal\Core\Database\ConnectionNotDefinedException
Drupal\Core\Database\DriverNotSpecifiedException
protected static final function openConnection($key, $target) {
if (empty(self::$databaseInfo)) {
self::parseConnectionInfo();
}
// 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: ' . $key);
}
if (!($driver = self::$databaseInfo[$key][$target]['driver'])) {
throw new DriverNotSpecifiedException('Driver not specified for this database connection: ' . $key);
}
$driver_class = "Drupal\\Core\\Database\\Driver\\{$driver}\\Connection";
$new_connection = new $driver_class(self::$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.
if (!empty(self::$logs[$key])) {
$new_connection
->setLogger(self::$logs[$key]);
}
return $new_connection;
}