From: Neil Saunders <n.j.saunders@gmail.com>
To: Leif B. Kristensen <leif@solumslekt.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: Triggers
Date: Tue, 22 Nov 2005 16:10:38 +0000
Message-ID: <ddcd549e0511220810k4cd578a7p700540a05ca4c827@mail.gmail.com> (raw)
In-Reply-To: <200511221644.35656.leif@solumslekt.org>
References: <Pine.LNX.4.44.0511221825001.24697-100000@matrix.gatewaynet.com>
<200511221644.35656.leif@solumslekt.org>
Try:
create or replace function update_last_edit() returns trigger as
$$
begin
new.last_edit=now();
return new;
end;
$$ language plpgsql;
On 11/22/05, Leif B. Kristensen <leif@solumslekt.org> wrote:
> On Tuesday 22 November 2005 17:25, Achilleus Mantzios wrote:
> >O Leif B. Kristensen Ýãñáøå óôéò Nov 22, 2005 :
> >> I'm trying to understand triggers. I have read the documentation in
> >> the manual as well as the few pages in the Douglas book about the
> >> subject, but I don't see how to implement a trigger that simply
> >> updates a 'last_edit' date field in my 'persons' table whenever I do
> >> an insert or update into my 'participants' table; that is a trigger
> >> that basically does an "UPDATE persons SET 'last_edit' = NOW() WHERE
> >> persons.person_id = participants.person_fk". Is that even possible?
> >
> >smth like:
> >foodb=# CREATE or REPLACE FUNCTION upd_dad() RETURNS "trigger" AS '
> >foodb'# BEGIN
> >foodb'# UPDATE dad set lastedit=now() where id=new.dadid;
> >foodb'# RETURN new;
> >foodb'# END;
> >foodb'# '
> >foodb-# LANGUAGE plpgsql;
> >CREATE FUNCTION
> >foodb=# CREATE TRIGGER upd_dad_tg AFTER INSERT OR UPDATE ON kid FOR
> > EACH ROW EXECUTE PROCEDURE upd_dad();
>
> leif=> create or replace function update_last_edit() returns trigger as
> $$
> leif$> begin
> leif$> update persons set last_edit=now() where person_id=new.person_fk;
> leif$> return new;
> leif$> end;
> leif$> $$ language plpgsql;
> CREATE FUNCTION
> leif=> create trigger update_last_edit after insert or update on
> participants
> leif-> for each row execute procedure update_last_edit();
> CREATE TRIGGER
> leif=> insert into participants (participant_id,person_fk) values (1,1);
> ERROR: record "new" has no field "last_edit"
> CONTEXT: PL/pgSQL function "process_last_edited" line 2 at assignment
> leif=>
>
> What am I missing?
> --
> Leif Biberg Kristensen | Registered Linux User #338009
> http://solumslekt.org/ | Cruising with Gentoo/KDE
>
> ---------------------------(end of broadcast)---------------------------
> TIP 2: Don't 'kill -9' the postmaster
>
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To: pgsql-sql@postgresql.org
Cc: n.j.saunders@gmail.com, leif@solumslekt.org
Subject: Re: Triggers
In-Reply-To: <ddcd549e0511220810k4cd578a7p700540a05ca4c827@mail.gmail.com>
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