Re: Bug for view with rules

Hi Donald,

I've tried this and it does indeed cause a crash. As suspected though,
it does appear to be ADO at fault, so I don't think there's a great deal
I can do about it I'm afraid.

Of course, pgAdmin III won't have this problem...

Regards, Dave.

-----Original Message-----
From: Donald Fraser [mailto:demolish(at)cwgsy(dot)net]
Sent: 23 December 2002 14:22
To: pgadmin-support(at)postgresql(dot)org
Subject: [pgadmin-support] Bug for view with rules


Hi Dave,
thanks for the latest fix.

Have spent all morning creating the situation for a view that
causes a crash - here it is...

First create a simple table such as:


CREATE TABLE public.tbl_catchbug (
id int4,
s_sometext text
) WITHOUT OIDS;

GRANT ALL ON TABLE public.tbl_catchbug TO PUBLIC;

GRANT ALL ON TABLE public.tbl_catchbug TO postgres;

Next create a view for the table such as:


CREATE VIEW public.vu_tbl_catchbug AS SELECT t.id, t.s_sometext
FROM tbl_catchbug AS t;

GRANT INSERT, SELECT, UPDATE ON TABLE public.vu_tbl_catchbug TO
PUBLIC;

GRANT ALL ON TABLE public.vu_tbl_catchbug TO postgres;

Next create a function in PL/SQL such as:


CREATE FUNCTION raise_exception1(text) RETURNS int4 AS '
DECLARE s_message ALIAS FOR $1;
BEGIN
RAISE EXCEPTION s_message;
RETURN -1;
END; ' LANGUAGE 'plpgsql';

Next create the following rules for the view:


CREATE RULE rul_vu_tbl_catchbug_i1 AS ON INSERT TO
vu_tbl_catchbug WHERE (id IS NULL AND s_sometext IS NULL) DO (SELECT
raise_exception1('You must supply some data'));

CREATE RULE rul_vu_tbl_catchbug_i2 AS ON INSERT TO
vu_tbl_catchbug WHERE (id IS NULL) DO (INSERT INTO tbl_catchbug (id,
s_sometext) VALUES('1', NEW.s_sometext));

CREATE RULE rul_vu_tbl_catchbug_i3 AS ON INSERT TO
vu_tbl_catchbug WHERE (id IS NOT NULL) DO (SELECT raise_exception1('This
is an exception'));

CREATE RULE rul_vu_tbl_catchbug_i4 AS ON INSERT TO
vu_tbl_catchbug DO INSTEAD NOTHING;

Finally do an insert into the view with the following SQL
statement:

INSERT INTO vu_tbl_catchbug (s_sometext) VALUES('This should
crash pgAdminII');

That should do the trick...

I'm off for the rest of the festive season (back to work on the
2nd),
hope you have a good one too,
regards,
Donald.