$res = XDB::query('SELECT prenom,IF(nom_usage="",nom,nom_usage) AS nom,promo,user_id
FROM auth_user_md5
WHERE user_id={?}', $p);
$res = XDB::query('SELECT prenom,IF(nom_usage="",nom,nom_usage) AS nom,promo,user_id
FROM auth_user_md5
WHERE user_id={?}', $p);