From: Tom Lane <tgl@sss.pgh.pa.us>
To: ldm@apartia.ch
Cc: pgsql-sql@hub.org
Subject: Re: knowing which columns have beend UPDATEd inside a TRIGGER?
Date: Tue, 24 Oct 2000 18:51:03 -0400
Message-ID: <26414.972427863@sss.pgh.pa.us> (raw)
In-Reply-To: <20001024155506.A775@styx>
References: <20001024155506.A775@styx>
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.
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.
regards, tom lane
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, ldm@apartia.ch, pgsql-sql@hub.org
Subject: Re: knowing which columns have beend UPDATEd inside a TRIGGER?
In-Reply-To: <26414.972427863@sss.pgh.pa.us>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox