public static function create(Comment $oComment)
 {
     $sQuery = 'insert into comment(product_id,name, user_email,comment,mark,date) values(';
     $sQuery .= "'{$oComment->getProduct()->getId()}', '{$oComment->getName()}','{$oComment->getUser()->getEmail()}','{$oComment->getComment()}','{$oComment->getMark()}','{$oComment->getDate()}'";
     $sQuery .= ')';
     $iRetExec = DBOperation::exec($sQuery);
     if (null !== ($sLastSqlError = DBOperation::getLastSqlError())) {
         throw new \Exception($sLastSqlError);
     }
 }