From: nha <lyondif02@free.fr>
To: Chester C Young <chestercyoung@yahoo.com>
Cc: PgSQL-sql <pgsql-sql@postgresql.org>
Subject: Re: how to tell if column set on update
Date: Tue, 21 Jul 2009 02:07:03 +0200
Message-ID: <4A6506A7.10809@free.fr> (raw)
In-Reply-To: <74512.7116.qm@web54304.mail.re2.yahoo.com>
References: <74512.7116.qm@web54304.mail.re2.yahoo.com>
Hello,
Le 20/07/09 15:19, chester c young a écrit :
> within a trigger need to know if the UPDATE statement set a column. the column might be set to the old value or a different value.
>
> (want to make sure the app is sending all necessary values)
>
> thanks
>
If the column to test is known -- e.g. column MyCol --, NEW.MyCol and
OLD.MyCol -- respectively value of MyCol after UPDATE and value of MyCol
before UPDATE -- can be compared.
I may be wrong if you are looking for the column(s) that are really
updated, not if such a column is updated or not. In this case, each
column of the target table may be tested with their respective new and
old values as well.
Regards.
--
nha / Lyon / France.
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Cc: lyondif02@free.fr, chestercyoung@yahoo.com
Subject: Re: how to tell if column set on update
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