public static function getConnection()
 {
     if (!self::$_connection) {
         //ambil semua konfigurasi di config
         $dbDns = Config::getConfig('dbdns');
         $dbPass = Config::getConfig('dbpass');
         $dbUser = Config::getConfig('dbuser');
         //now koneksi dengan PDO
         try {
             self::$_connection = new PDO($dbDns, $dbuser, $dbUser);
             if (self::$_connection === FALSE) {
                 throw new Exception("Koneksi Gagal");
             } else {
                 $this->konek = self::$_connection;
             }
         } catch (PDOException $e) {
             echo "Error : " . $e->getMessage() . "<br/>";
         }
     }
     return self::$_connection;
 }