Message-ID: <1029879444.3d62b694112ac@bugs.unl.edu.ar>
Date: Tue, 20 Aug 2002 18:37:24 -0300
From: Martin Marques <martin@bugs.unl.edu.ar>
To: Stephan Szabo <sszabo@megazone23.bigpanda.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: functions and triggers
References: <20020820141353.B45554-100000@megazone23.bigpanda.com>
In-Reply-To: <20020820141353.B45554-100000@megazone23.bigpanda.com>
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Quoting Stephan Szabo <sszabo@megazone23.bigpanda.com>:

> 
> > The problemas are two:
> >
> > 1) when I try to create the trigger, it says that the function doesn't
> exist.
> > Why is this happening?
> 
> You should probably show us what you were trying to do, but I'm going to
> guess that the function doesn't have the right signature.  On
> current versions, Trigger functions should return opaque and take no
> arguments (any arguments given on the create trigger line are passed
> in a different fashion).

I have this function which works OK.

CREATE FUNCTION ahora (integer) RETURNS integer AS '
UPDATE usuarios SET tmodif = now()
WHERE codigo = $1;
SELECT 1 as RESULT;
' LANGUAGE SQL

> > 2) How does the trigger tell the function the row number identifier?
> 
> I'm not sure what you mean by this.  Getting at the row being worked on
> depends somewhat on what language you're using.

I thought about a simple SQL that does the update.
You mean I just call the function from the trigger and thats all?


-- 
Porqué usar una base de datos relacional cualquiera,
si podés usar PostgreSQL?
-----------------------------------------------------------------
Martín Marqués                  |        mmarques@unl.edu.ar
Programador, Administrador, DBA |       Centro de Telematica
                       Universidad Nacional
                            del Litoral
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