On Mon, 2002-07-29 at 20:52, Peter Atkins wrote: > Is there a possibility of another application accessing the DB and using the > id before my function has completed the transaction? I'm concerned with the > possibility of cross-over of ID's if the insert hangs. > > There's no way to return the id of that insert inherently, and then use it > for the second insert? I think SQL uses something like ADD_ID, not sure.
That's the beauty of the nextval statement. The database internally sequences requests to it so that you're kept out of harm's way. Say process A called the function,and nextval returns 16. The function now continues on its way, but is not finished when process B then calls the function (before A is done), and nextval returns 17. So, then function called by process A returns 16, and the function called by process B returns 17. That means that unless the results of process B depend in some way upon the results of process A, there's no problem. -Ken -- Ken Corey CTO http://www.atomic-interactive.com 07720 440 731 ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org
