Re: Problems with transactions and sequences

Sune Nielsen <sunegn(at)image(dot)dk> writes:
> Now, the problem is that I wish to extract the sequence number from a
> newly inserted user, like this:

> INSERT INTO Users (name) VALUES ('JohnDoe');
> SELECT CURRVAL('users_bid_seq');

> This works perfectly(!), but my project involves multiple simultanous
> users so I have to use transactions like this:

> BEGIN;
> INSERT INTO Users (name) VALUES ('JohnDoe');
> SELECT CURRVAL('users_bid_seq');
> COMMIT;

No, you don't need the BEGIN/COMMIT. Read the description of currval
again.

> This, however, doesn't work although I thought it should. It doesn't
> return anything at all?!?!

Surely it does. You didn't say exactly what client-side code you are
using, but I suspect it's looking at the result of the COMMIT step
(ie, nothing) instead of the result of the prior SELECT.

regards, tom lane