public function getReviewUserHash($sUserId)
    {
        $oDb = \OxidEsales\Eshop\Core\DatabaseProvider::getDb();
        $sReviewUserHash = $oDb->getOne('select md5(concat("oxid", oxpassword, oxusername )) from oxuser where oxid = ' . $oDb->quote($sUserId) . '');

        return $sReviewUserHash;
    }