Greetings list,
Running pg 8.2.3. on a windows machine, I have become blind in a
trigger definition puzzle, so hope that somebody may help me understand
where I goof.
I have a base table i_s that has three tables that inherit from it, one
of them being i_s_nowhere. The base table should be left empty, but I
want it to be the prime port of call for data changes. Hence the
following set-up. Let me try to be brief, in the hope of not leaving
out relevant detail.
Base table def is as follows:
CREATE TABLE i_s
(sidx integer NOT NULL, -- The s identifiergid integer NOT NULL, -- The i identifierstatus character(1),confirmation
character(1),CONSTRAINTpk_is PRIMARY KEY (sidx, gid)
)
WITH (OIDS=FALSE);
And the trigger definition is here:
CREATE TRIGGER aw_archival_is2BEFORE UPDATE OR INSERT OR DELETEON i_sFOR EACH ROWEXECUTE PROCEDURE aw_archive_test();
And the trigger function:
CREATE OR REPLACE FUNCTION aw_archive_test()RETURNS "trigger" AS
$BODY$
BEGINRAISE WARNING 'Starting isa trigger for %', TG_OP;IF (TG_OP = 'UPDATE') THEN RAISE WARNING 'Calling insert_isa
withupdate';ELSIF (TG_OP = 'INSERT') THEN RAISE WARNING 'Calling insert_isa with insert';ELSIF (TG_OP = 'DELETE')
THEN RAISE WARNING 'Calling insert_isa with delete';END IF; RETURN NULL;
END;
$BODY$LANGUAGE 'plpgsql' VOLATILE;
The trigger is enabled.
Yes, this does intentionally nothing. The real code will obviously take
care of data change in proper subtables. Well, the trigger should do
nothing now . . . What I cannot get round to understanding is that an
insert attempt will nicely give me two warnings, and will not insert, as
expected with this code:
WARNING: Starting isa trigger for INSERTWARNING: Calling insert_isa with insert
Query returned successfully: 0 rows affected, 31 ms execution time.
But an attempt to update actually magically goes to the proper subtable
and performs the update:
Query returned successfully: 1 rows affected, 16 ms execution time.
Where did I deserve this?? ;-)
In attempts to solve this I did mess around with trigger and trigger
function definitions a bit. Could there be funny traces of this? What
is the best way to analyse this behavior? I am testing from a pgAdmin
1.8 setup.
All suggestions welcome!
--
Rolf A. de By
The Netherlands
