From: | nha <lyondif02(at)free(dot)fr> |
---|---|
To: | Chester C Young <chestercyoung(at)yahoo(dot)com> |
Cc: | PgSQL-sql <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: how to tell if column set on update |
Date: | 2009-07-21 00:07:03 |
Message-ID: | 4A6506A7.10809@free.fr |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-sql |
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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