Date: Tue, 29 Jul 2014 11:52:12 +0200 (CEST)
From: Andreas Joseph Krogh <andreas@visena.com>
To: pgsql-sql@postgresql.org
Message-ID: <VisenaEmail.39.362cb9f24c93a770.14781853e94@tc7-on>
Subject: Update columns in the same table in a deferred constraint trigger
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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 value=
 of=20
"name", so I created this trigger: =C2=A0 CREATE OR REPLACE FUNCTION fisk_t=
f()=20
returns TRIGGER AS $$
 BEGIN
 =C2=A0=C2=A0=C2=A0 raise notice 'name %', NEW.name <http://NEW.name>;
 =C2=A0=C2=A0=C2=A0 NEW.autofisk =3D NEW.name <http://NEW.name> || CURRENT_=
TIMESTAMP::text;
 =C2=A0=C2=A0=C2=A0 RETURN NEW;
 END;
 $$ LANGUAGE plpgsql; =C2=A0 CREATE CONSTRAINT TRIGGER fisk_t AFTER INSERT =
OR=20
UPDATE ON fisk DEFERRABLE INITIALLY DEFERRED
 FOR EACH ROW EXECUTE PROCEDURE fisk_tf(); =C2=A0 The problem is that "auto=
fisk" is=20
never populated: andreak=3D# begin;
 BEGIN
 andreak=3D# insert into fisk(name) values ('a');
 INSERT 0 1
 andreak=3D# commit;
 NOTICE:=C2=A0 name a
 COMMIT
 andreak=3D# table fisk;
 =C2=A0name | autofisk
 ------+----------
 =C2=A0a=C2=A0=C2=A0=C2=A0 |
 (1 row) =C2=A0 Is it possible to do what I want, namely to update a column=
 in a=20
table in an AFTER INSERT OR UPDATE constraint trigger on the same table? =
=C2=A0=20
Thanks. =C2=A0 -- Andreas Joseph Krogh CTO / Partner - Visena AS Mobile: +4=
7 909 56=20
963 andreas@visena.com <mailto:andreas@visena.com> www.visena.com=20
<https://www.visena.com>  <https://www.visena.com>
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<div>Hi all.</div>

<div>=C2=A0</div>

<div>I have this simple schema:</div>

<div>=C2=A0</div>

<div>create table fisk(<br>
=C2=A0=C2=A0=C2=A0 name varchar primary key,<br>
=C2=A0=C2=A0=C2=A0 autofisk varchar<br>
);</div>

<div>=C2=A0</div>

<div>I want to update the column &quot;autofisk&quot; on commit based the v=
alue of &quot;name&quot;, so I created this trigger:</div>

<div>=C2=A0</div>

<div>CREATE OR REPLACE FUNCTION fisk_tf() returns TRIGGER AS $$<br>
BEGIN<br>
=C2=A0=C2=A0=C2=A0 raise notice 'name %', <a href=3D"http://NEW.name" targe=
t=3D"_blank">NEW.name</a>;<br>
=C2=A0=C2=A0=C2=A0 NEW.autofisk =3D <a href=3D"http://NEW.name" target=3D"_=
blank">NEW.name</a> || CURRENT_TIMESTAMP::text;<br>
=C2=A0=C2=A0=C2=A0 RETURN NEW;<br>
END;<br>
$$ LANGUAGE plpgsql;</div>

<div>=C2=A0</div>

<div>CREATE CONSTRAINT TRIGGER fisk_t AFTER INSERT OR UPDATE ON fisk DEFERR=
ABLE INITIALLY DEFERRED<br>
FOR EACH ROW EXECUTE PROCEDURE fisk_tf();</div>

<div>=C2=A0</div>

<div>The problem is that &quot;autofisk&quot; is never populated:</div>

<div>
<div>andreak=3D# begin;<br>
BEGIN<br>
andreak=3D# insert into fisk(name) values ('a');<br>
INSERT 0 1<br>
andreak=3D# commit;<br>
NOTICE:=C2=A0 name a<br>
COMMIT<br>
andreak=3D# table fisk;<br>
=C2=A0name | autofisk<br>
------+----------<br>
=C2=A0a=C2=A0=C2=A0=C2=A0 |<br>
(1 row)</div>

<div>=C2=A0</div>

<div>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?</div>

<div>=C2=A0</div>

<div>Thanks.</div>
</div>

<div>=C2=A0</div>

<div class=3D"origo-email-signature">
<div>--
<div><span style=3D"font-family:arial,helvetica,sans-serif;"><strong>Andrea=
s Joseph Krogh</strong></span></div>

<div><span style=3D"font-family:arial,helvetica,sans-serif;">CTO / Partner<=
/span> - Visena AS</div>

<div><span style=3D"font-family:arial,helvetica,sans-serif;">Mobile: +47 90=
9 56 963</span></div>

<div><a href=3D"mailto:andreas@visena.com">andreas@visena.com</a></div>

<div><a href=3D"https://www.visena.com">www.visena.com</a></div>

<div style=3D"padding-top: 5px"><a href=3D"https://www.visena.com"><img alt=
=3D"" src=3D"cid:part_F15878384999805BGLH"></a></div>
</div>
</div>
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