Why doesn't this update...

[Spam.Diz]

I have a simple script I am testing and it says ok but when I go to my phpadmin browse it shows no changes. I am running this as a scheduled task from the cron folder. I have also tried without the check for null and still said ok. All help appreciated. Thanks.

<?php
error_reporting(E_ALL & ~E_NOTICE);
if ($DB_site == NULL)
{
	exit;
}
$DB_site->query(" 
   UPDATE " . TABLE_PREFIX . "user 
   posts = 0, reputation = 0
"); 
?>