From: Louis-David Mitterrand <cunctator@apartia.ch>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-sql@hub.org
Subject: Re: knowing which columns have beend UPDATEd inside a TRIGGER?
Date: Wed, 25 Oct 2000 08:23:20 +0200
Message-ID: <20001025082320.A1941@styx> (raw)
In-Reply-To: <26414.972427863@sss.pgh.pa.us>
References: <20001024155506.A775@styx>
<26414.972427863@sss.pgh.pa.us>
On Tue, Oct 24, 2000 at 06:51:03PM -0400, Tom Lane wrote:
> Louis-David Mitterrand <cunctator@apartia.ch> writes:
> > Is there a way to know which columns are being UPDATEd or INSERTEd from
> > inside a trigger, either in C or pl/pgsql?
>
> Huh? An INSERT always inserts all columns, by definition. Some of them
> might be null and/or equal to their default values, but they're all
> there.
*slap* Doh! Thanks for clearing up my mind about this ;-)
> For an UPDATE, you could check to see whether old.col = new.col.
> This would miss the case where an UPDATE command is explicitly setting
> a column to the same value it already had; dunno if you care or not.
That is so obvious I didn't think about it, and it's exactly what I
need.
Thanks a lot,
--
Louis-David Mitterrand - ldm@apartia.org - http://www.apartia.org
Hi. This is my friend, Jack Shit, and you don't know him.
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To: pgsql-sql@postgresql.org
Cc: cunctator@apartia.ch, tgl@sss.pgh.pa.us, pgsql-sql@hub.org
Subject: Re: knowing which columns have beend UPDATEd inside a TRIGGER?
In-Reply-To: <20001025082320.A1941@styx>
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