From: Pavel Stehule <pavel.stehule@gmail.com>
To: Andreas Joseph Krogh <andreas@visena.com>
Cc: postgres list <pgsql-sql@postgresql.org>
Subject: Re: Update columns in the same table in a deferred constraint trigger
Date: Tue, 29 Jul 2014 11:56:17 +0200
Message-ID: <CAFj8pRBGLHFwp8Gur2VydJ3TmpXG=1yPs_qwMR0bnVf6O2CAuA@mail.gmail.com> (raw)
In-Reply-To: <VisenaEmail.39.362cb9f24c93a770.14781853e94@tc7-on>
References: <VisenaEmail.39.362cb9f24c93a770.14781853e94@tc7-on>
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Hi
2014-07-29 11:52 GMT+02:00 Andreas Joseph Krogh <andreas@visena.com>:
> Hi all.
>
> I have this simple schema:
>
> create table fisk(
> name varchar primary key,
> autofisk varchar
> );
>
> I want to update the column "autofisk" on commit based the value of
> "name", so I created this trigger:
>
> CREATE OR REPLACE FUNCTION fisk_tf() returns TRIGGER AS $$
> BEGIN
> raise notice 'name %', NEW.name;
> NEW.autofisk = NEW.name || CURRENT_TIMESTAMP::text;
> RETURN NEW;
> END;
> $$ LANGUAGE plpgsql;
>
> CREATE CONSTRAINT TRIGGER fisk_t AFTER INSERT OR UPDATE ON fisk DEFERRABLE
> INITIALLY DEFERRED
>
It should be BEFORE INSERT OR UPDATE trigger
Regards
Pavel
> FOR EACH ROW EXECUTE PROCEDURE fisk_tf();
>
> The problem is that "autofisk" is never populated:
> andreak=# begin;
> BEGIN
> andreak=# insert into fisk(name) values ('a');
> INSERT 0 1
> andreak=# commit;
> NOTICE: name a
> COMMIT
> andreak=# table fisk;
> name | autofisk
> ------+----------
> a |
> (1 row)
>
> Is it possible to do what I want, namely to update a column in a table in
> an AFTER INSERT OR UPDATE constraint trigger on the same table?
>
> Thanks.
>
> --
> *Andreas Joseph Krogh*
> CTO / Partner - Visena AS
> Mobile: +47 909 56 963
> andreas@visena.com
> www.visena.com
> <https://www.visena.com;
>
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To: pgsql-sql@postgresql.org
Cc: pavel.stehule@gmail.com, andreas@visena.com
Subject: Re: Update columns in the same table in a deferred constraint trigger
In-Reply-To: <CAFj8pRBGLHFwp8Gur2VydJ3TmpXG=1yPs_qwMR0bnVf6O2CAuA@mail.gmail.com>
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