Re: Emulating trigger BEFORE SELECT behavior

From: Atri Sharma <atri(dot)jiit(at)gmail(dot)com>
To: fabriziomello(at)gmail(dot)com
Cc: Adrian Klaver <adrian(dot)klaver(at)gmail(dot)com>, Alfonso Afonso <aafonsoc(at)gmail(dot)com>, PostgreSQL General <pgsql-general(at)postgresql(dot)org>
Subject: Re: Emulating trigger BEFORE SELECT behavior
Date: 2013-04-18 14:38:49
Message-ID: CAOeZVidRs_dHbULZCvD5w-8iOedaHWZf5oTTLL5Mi-_afB1UTw@mail.gmail.com
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> Why you just create your track function and a view to call it?
>
> Example:
>
> BEGIN;
>
> CREATE TABLE foo (id SERIAL PRIMARY KEY, data TEXT);
> CREATE TABLE foo_track(tracktime TIMESTAMP DEFAULT now(), foo_row foo);
>
> INSERT INTO foo (data) SELECT 'Some Data'||id FROM generate_series(1,10) AS
> id;
>
> CREATE OR REPLACE FUNCTION foo_track_func(foo) RETURNS integer AS
> $$
> INSERT INTO foo_track(foo_row) VALUES ($1) RETURNING (foo_row).id
> $$
> LANGUAGE sql;
>
> CREATE VIEW v_foo AS SELECT foo.*, foo_track_func(foo.*) FROM foo;
>
> SELECT * FROM v_foo;
> SELECT * FROM foo_track;
>
> COMMIT;
>
>

Wow! It seems just right. Thanks, let me try it out.

Regards,

Atri

--
Regards,

Atri
l'apprenant

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