PEAR DB Return Serial

Hi everyone, I'm writing a script that inserts data into a postgres table. The ID column is the primary key, and is just a serial that auto increments on every insert. I need to know how to get PEAR to return the value of the inserted ID. So, say I have something like this: $data = array(1, 'true'); $sth=$this->db->prepare("insert into customer (id_vendor, status) values (?,?)"); $r=$this->db->execute($sth,$data); Say the results of the insert look something like this: Id | id_vendor | status 23 1 t I need PEAR to return the number 23 to me without having to do a fetch query seperately. Anyway to get this? Thanks