public static function connect(User $oUser)
 {
     $sQuery = "select * from user where email ='{$oUser->getEmail()}' and password = '******' limit 1";
     $bResult = false !== DBOperation::getOne($sQuery);
     if ($bResult) {
         $_SESSION['email'] = $oUser->getEmail();
     } else {
         unset($_SESSION['email']);
     }
     return $bResult;
 }