Checking result of $db->query_write
 

What is the recommended way of checking the outcome of a "$db->query_write"?

I want to either update a record with a defined id number, or insert a record if the id number doesn't exist. I thought that I would be able to do an update transaction first, check if there is an error, and only then do an insert transaction if needed.

All suggestions as to the best way to do this gratefully received. :)

You can use mysql_affected_rows();
I'm not sure but vBulletin may use $vbulletin->db->affected_rows();

Thank you Andrew, I'll look into that. :)