private static function _saveControlUrl()
        {


            $oStatement = self::$_connection->prepare('INSERT INTO  `system_settings` (`key` ,`value`)VALUES (:key,  :value);');
            $oResult    = $oStatement->execute(array(
                                                   ":key"   => "control_url",
                                                   ":value" => self::$_data['controlUrl'],
                                               ));

            if ($oResult !== true) {
                throw new Exception("Error while inserting control url");
            }

            $oStatement = self::$_connection->prepare('INSERT INTO `license` (`id`, `max_clients`, `domain`, `serial`, `valid_until`) VALUES (null, 0, :control_url , \'\', 0);');
            $oResult    = $oStatement->execute(array(
                                                   ":control_url" => self::$_data['controlUrl'],
                                               ));


        }