[support] How to get the auto-increment value

Hi All I have a table, where 'cid' field is of type "serial".

Schema declaration is -> *"'cid' => array('type' => 'serial', 'unsigned' => TRUE, 'not null' => TRUE, ),"*

Aim is to have an incremented value for it. The code is as below

*$lastid = 0; for($delta = 0; $delta < $all_companies; $delta++) { $lastid = db_last_insert_id(rs_companies, cid) + 1; db_query( 'INSERT INTO {rs_companies} ( cid, uid, prevcompany, joindate, releasedate) ' ."VALUES (%d, '%d', '%s', '%d', '%d')", $lastid, *

With this, I find this 'cid' field is not auto incrementing. Any idea, whats the wrong here.

Best Regards Austin.