[calorie]

If your DB class is for the same database where vB is located, it might just be easier to be rid of your class. Otherwise you can try a class_bbcode.php file edit, replacing query_read with just query, but if you are going to file edit, then maybe set a constant in your script, and then file edit the vB script, so that for your script $db->query is used and for vB, it uses what it uses.