From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com> |
Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Foreign key trigger timing bug? |
Date: | 2005-12-09 19:42:53 |
Message-ID: | 200512091942.jB9JgrA25777@candle.pha.pa.us |
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Lists: | pgsql-hackers |
Stephan Szabo wrote:
> On Wed, 7 Dec 2005, Bruce Momjian wrote:
>
> > I had an open 8.1 item that was:
> >
> > o fix foreign trigger timing issue
> >
> > Would someone supply text for a TODO entry on this, as I don't think we
> > fixed it in 8.1.
>
> I'd split this into two separate items now.
>
> Fix before delete triggers on cascaded deletes to run after the cascaded
> delete is done. This is odd, but seems to be what the spec requires.
>
> Fix problems with referential action caused before triggers that modify
> rows that would also be modified by the referential action. Right now,
> this has a few symptoms, either you can get spurious seeming errors from
> the constraint or you can end up with invalid data in the referencing
> table. As far as I can see, the spec doesn't have much to say about this
> because the spec doesn't seem to allow before triggers to modify tables.
I have updated the CREATE TRIGGER documentation to highlight these
items, and the fact we consider our current behavior on the first item
to be correct.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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