public static function connect($dbType, $dbName, $serverName = '127.0.0.1', $port = '3306', $user = 'root', $password = '', $options = [], $cache = false) {
		self::$db = new Database ( $dbType, $dbName, $serverName, $port, $user, $password, $options, $cache );
		try {
			self::$db->connect ();
		} catch ( \Exception $e ) {
			Logger::error ( "DAO", $e->getMessage () );
			throw new DAOException ( $e->getMessage (), $e->getCode (), $e->getPrevious () );
		}
	}