public function __construct($user, $password, $database, $host, $port = 3306, $engine = "mssql")
 {
     parent::__construct($user, $password, $database, $host, $port, $engine);
 }
 public function __construct($user, $password, $database, $host, $port = 5432, $engine = "postgresql")
 {
     parent::__construct($user, $password, $database, $host, $port, $engine);
 }