OCA\OcSms\Db\SmsMapper::getLastTimestamp PHP Method

    public function getLastTimestamp($userId)
    {
        $query = \OCP\DB::prepare('SELECT max(sms_date) as mx FROM ' . '*PREFIX*ocsms_smsdatas WHERE user_id = ?');
        $result = $query->execute(array($userId));
        if ($row = $result->fetchRow()) {
            return $row["mx"];
        }
        return 0;
    }