From: | "Josh Berkus" <josh(at)agliodbs(dot)com> |
---|---|
To: | Rory Campbell-Lange <mail(at)campbell-lange(dot)net>, pgsql-novice(at)postgresql(dot)org |
Subject: | Re: return column id from insert |
Date: | 2002-11-12 17:37:07 |
Message-ID: | web-1822663@davinci.ethosmedia.com |
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Lists: | pgsql-novice |
Rory,
> The issue is this:
> I need to make a database insert and then make an image with the
> resulting column id number, which is provided by a sequence.
I think you mean "primary key" or "row id", not "column id". There is
no "column id".
> This has to be a single action, otherwise I could fall into a race
> condition with another insert going on concurrently.
No, you can't. PostgreSQL sequences are guarenteed 100% unique
regardless of concurrent updates. Simply put:
BEGIN TRANSACTION;
INSERT INTO some_table ( columns )
VALUES ( values);
SELECT CURRVAL('some_table_seq');
COMMIT TRANSACTION;
Easy, no?
Now please go read the online docs, or better yet, buy an introductory
PostgreSQL book. There's a lot to learn.
-Josh Berkus
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