public static function updateReservationStatus($resId, $status, $sendEmail)
 {
     Database::doQuery("UPDATE " . Database::addPrefix(ReservationDao::table_name) . " SET mod_status = '" . Database::makeStringSafe($status) . "'" . " WHERE res_id = '" . Database::makeStringSafe($resId) . "'");
     if ($sendEmail) {
         $reservation = ReservationDao::getReservation($resId);
         $user = UserDao::getUserByID($reservation->userId);
         EmailUtil::sendUpdateReservationNotice($user, $reservation);
     }
 }