Thread: triggers vs. 'NEW in non-rule query' -- SOLVED?
On Sat, Mar 03, 2001 at 11:50:03PM -0500, Ron Peterson wrote: > > Could you provide an example of what *doesn't* work? > i THINK i've got it! MWAAH HA HA... i follow the example from the postgresql-doc/html/user/c4*40.html document and define a function to be called via TRIGGER... CREATE FUNCTION easy() RETURNS OPAQUE AS ' DECLARE x CHAR(1) := NEW.somefield FROM 1 FOR 1; BEGIN -- whatever, yada yada, bada bing bada boom RETURN NEW; END; ' language 'plpgsql'; and this results in "ERROR: use of NEW in non-rule procedure" when actually called via TRIGGER. i change it instead to CREATE FUNCTION easy() RETURNS OPAQUE AS ' DECLARE x CHAR(1); -- no := assignment here BEGIN x := NEW.somefield FROM 1 FOR 1; -- whatever, yada yada, bada bing bada boom RETURN NEW; END; ' language 'plpgsql'; and suddenly all is right with the world. so i can't refer to the NEW (or probably OLD) pseudotables WITHIN THE DECLARE section. apparently. Q: is this a bug? is this a feature? -- It is always hazardous to ask "Why?" in science, but it is often interesting to do so just the same. -- Isaac Asimov, 'The Genetic Code' will@serensoft.com http://groups.yahoo.com/group/newbieDoc -- we need your brain! http://www.dontUthink.com/ -- your brain needs us!
will trillich wrote: > > i THINK i've got it! MWAAH HA HA... > Congrats > i follow the example from the postgresql-doc/html/user/c4*40.html > document and define a function to be called via TRIGGER... > > CREATE FUNCTION easy() RETURNS OPAQUE AS ' > DECLARE > x CHAR(1) := NEW.somefield FROM 1 FOR 1; > BEGIN > -- whatever, yada yada, bada bing bada boom > RETURN NEW; > END; > ' language 'plpgsql'; Grmpf - exactly that's missing in the "#option dump" output - the calculation of default values for variable initialization. I was looking at your log-snippent over and over again and couldn't see it :-) > > and this results in "ERROR: use of NEW in non-rule procedure" > when actually called via TRIGGER. i change it instead to > > CREATE FUNCTION easy() RETURNS OPAQUE AS ' > DECLARE > x CHAR(1); -- no := assignment here > BEGIN > x := NEW.somefield FROM 1 FOR 1; > -- whatever, yada yada, bada bing bada boom > RETURN NEW; > END; > ' language 'plpgsql'; > > and suddenly all is right with the world. so i can't refer to the > NEW (or probably OLD) pseudotables WITHIN THE DECLARE section. > apparently. > > Q: is this a bug? is this a feature? A missing feature, and something that should be on 7.2's TODO. Jan -- #======================================================================# # It's easier to get forgiveness for being wrong than for being right. # # Let's break this rule - forgive me. # #================================================== JanWieck@Yahoo.com # _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com
> > apparently. > > > > Q: is this a bug? is this a feature? > > A missing feature, and something that should be on 7.2's > TODO. > Please supply a TODO line. I can't figure it out. -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 853-3000 + If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania 19026