public static function subscribe(User $oUser)
{
$sQuery = "insert into user(email, password,address,name,firstname,cp,city) ";
$sQuery .= "values('{$oUser->getEmail()}','{$oUser->getCryptedPassword()}','{$oUser->getAddress()}','{$oUser->getName()}','{$oUser->getFirstName()}','{$oUser->getCp()}','{$oUser->getCity()}')";
return DBOperation::exec($sQuery);
}