On 17 October 2011 15:20, Merlin Moncure <mmoncure@gmail.com> wrote:
> A better way to do this is to query information_schema:
>
> PERFORM 1 FROM information_schema.tables where schema_name = x and
> table_name = y;
>
> IF FOUND THEN
> CREATE TABLE ...
> END IF;
>
> (there is a race condition in the above code -- do you see it? if
> concurrent access to this function is an issue, you have to LOCK an
> object before running the PERFORM or perhaps use an advisory lock).
Is there? You'd think that with transactional DDL and the code running
in a single transaction (namely inside a stored function) it would be
concurrency-safe.
--
If you can't see the forest for the trees,
Cut the trees and you'll see there is no forest.