Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1XC4IR-0006xK-5F for pgsql-sql@arkaria.postgresql.org; Tue, 29 Jul 2014 10:06:15 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.80) (envelope-from ) id 1XC4IQ-0007lh-3L for pgsql-sql@arkaria.postgresql.org; Tue, 29 Jul 2014 10:06:14 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1XC4IP-0007lY-Ao for pgsql-sql@postgresql.org; Tue, 29 Jul 2014 10:06:13 +0000 Received: from post.officenet.no ([195.225.13.103]) by magus.postgresql.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1XC4IM-0000YK-0j for pgsql-sql@postgresql.org; Tue, 29 Jul 2014 10:06:12 +0000 Received: from [10.47.1.10] (helo=tc7-on) by post.officenet.no with esmtp (Exim 4.76) (envelope-from ) id 1XC4IJ-00010E-Ih for pgsql-sql@postgresql.org; Tue, 29 Jul 2014 12:06:09 +0200 Received: from localhost ([127.0.0.1] helo=tc7-on) by tc7-on with esmtp (Exim 4.76) (envelope-from ) id 1XC4Hu-000BFF-VN for pgsql-sql@postgresql.org; Tue, 29 Jul 2014 12:05:42 +0200 Date: Tue, 29 Jul 2014 12:05:42 +0200 (CEST) From: Andreas Joseph Krogh To: pgsql-sql@postgresql.org Message-ID: In-Reply-To: Subject: Re: Update columns in the same table in a deferred constraint trigger MIME-Version: 1.0 X-Mailer: Visena Mail 1.9.0-SNAPSHOT X-Spam-Score: -1.0 X-Spam-Report: SpamAssasin (score=-1.0, required 5.0 ALL_TRUSTED=-1, HTML_MESSAGE=0.001) X-Pg-Spam-Score: 1.4 (+) Content-Type: multipart/related; boundary="----=_Part_16_1353407492.1406628342811" List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-sql Precedence: bulk Sender: pgsql-sql-owner@postgresql.org ------=_Part_15_128492561.1406628342811 Content-Type: multipart/related; boundary="----=_Part_16_1353407492.1406628342811" ------=_Part_16_1353407492.1406628342811 Content-Type: multipart/alternative; boundary="----=_Part_17_641867712.1406628342885" ------=_Part_17_641867712.1406628342885 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable P=C3=A5 tirsdag 29. juli 2014 kl. 12:01:48, skrev Pavel Stehule < pavel.stehule@gmail.com >: =C2=A0 =C2=A0 20= 14-07-29 11:59=20 GMT+02:00 Andreas Joseph Krogh>:=20 P=C3=A5 tirsdag 29. juli 2014 kl. 11:56:17, skrev Pavel Stehule < pavel.stehule@gmail.com >: Hi =C2=A0 2014-0= 7-29=20 11:52 GMT+02:00 Andreas Joseph Krogh>: Hi all. =C2=A0 I have this simple schema: =C2= =A0 create=20 table fisk( =C2=A0=C2=A0=C2=A0 name varchar primary key, =C2=A0=C2=A0=C2=A0 autofisk varchar ); =C2=A0 I want to update the column "autofisk" on commit based the value= of=20 "name", so I created this trigger: =C2=A0 CREATE OR REPLACE FUNCTION fisk_t= f()=20 returns TRIGGER AS $$ BEGIN =C2=A0=C2=A0=C2=A0 raise notice 'name %', NEW.name ; =C2=A0=C2=A0=C2=A0 NEW.autofisk =3D NEW.name || CURRENT_= TIMESTAMP::text; =C2=A0=C2=A0=C2=A0 RETURN NEW; END; $$ LANGUAGE plpgsql; =C2=A0 CREATE CONSTRAINT TRIGGER fisk_t AFTER INSERT = OR=20 UPDATE ON fisk DEFERRABLE INITIALLY DEFERRED =C2=A0 It should be BEFORE INS= ERT OR=20 UPDATE trigger =C2=A0 He he, yes - I know that will work, but I need the tr= igger to=20 be run as a constraint-trigger, on commit, after all the data is populated = in=20 other tables and this table. =C2=A0 It is not possible - Postgres can chang= e data=20 only before writing =C2=A0 Is there a work-around, so I in the trigger can = issue for=20 example: =C2=A0 update fisk set autofisk =3D NEW.name ||= =20 CURRENT_TIMESTAMP::text where name =3D NEW.name; =C2=A0 without it also tri= ggering the=20 trigger? =C2=A0 I have tried this but the commit never returns, I think bec= ause it=20 recursively triggers the trigger again for that modification. =C2=A0 Will= =20 temporarily disabeling the trigger inside the trigger (in a transaction) wo= rk? =C2=A0 --Andreas Joseph Krogh CTO / Partner - Visena AS Mobile: +47 909 56 963=20 andreas@visena.com www.visena.com=20 =C2=A0 ------=_Part_17_641867712.1406628342885 Content-Type: text/html;charset=UTF-8 Content-Transfer-Encoding: quoted-printable
P=C3=A5 tirsdag 29. juli 2014 kl. 12:01:48, skrev Pavel Stehule <pavel.stehule@gmail.com>:
=C2=A0
=C2=A0
2014-07-29 11:59 GMT+02:00 Andreas Joseph Krogh = <andreas@visena.com>:
P=C3=A5 tirsdag 29. juli 2014 kl. 11:56:17, skrev Pavel Stehule <pavel.stehule@gm= ail.com>:
Hi
=C2=A0
2014-07-29 11:52 GMT+02:00 Andreas Joseph Krogh = <andreas@visena.com>:
Hi all.
=C2=A0
I have this simple schema:
=C2=A0
create table fisk(
=C2=A0=C2=A0=C2=A0 name varchar primary key,
=C2=A0=C2=A0=C2=A0 autofisk varchar
);
=C2=A0
I want to update the column "autofisk" on commit based the v= alue of "name", so I created this trigger:
=C2=A0
CREATE OR REPLACE FUNCTION fisk_tf() returns TRIGGER AS $$
BEGIN
=C2=A0=C2=A0=C2=A0 raise notice 'name %', NEW.name;
=C2=A0=C2=A0=C2=A0 NEW.autofisk =3D NEW.name || CURRENT_TIMESTAMP::text;
=C2=A0=C2=A0=C2=A0 RETURN NEW;
END;
$$ LANGUAGE plpgsql;
=C2=A0
CREATE CONSTRAINT TRIGGER fisk_t AFTER INSERT OR UPDATE ON fisk DEFERR= ABLE INITIALLY DEFERRED
=C2=A0
It should be BEFORE INSERT OR UPDATE trigger
=C2=A0
He he, yes - I know that will work, but I need the trigger to be run a= s a constraint-trigger, on commit, after all the data is populated in other= tables and this table.
=C2=A0
It is not possible - Postgres can change data only before= writing
=C2=A0
Is there a work-around, so I in the trigger can issue for example:
=C2=A0
update fisk set autofisk =3D NEW.name || CURRENT_TIMESTAMP::text where name =3D NEW.name;
=C2=A0
without it also triggering the trigger?
=C2=A0
I have tried this but the commit never returns, I think because it rec= ursively triggers the trigger again for that modification.
=C2=A0
Will temporarily disabeling the trigger inside the trigger (in a trans= action) work?
=C2=A0
--
Andrea= s Joseph Krogh
CTO / Partner<= /span> - Visena AS
Mobile: +47 90= 9 56 963
=3D""
=C2=A0
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