Обсуждение: How can I write trigger on a columns insert/update?
How can I write trigger on a columns insert/update?
CREATE TRIGGER mytrigger
BEFORE
INSERT OR UPDATE
OF mycolumn ON mytable
FOR EACH ROW
EXECUTE PROCEDURE myfunction();
I am getting error “syntax error at or near "OF"
Thanks
Dinesh Pandey wrote: > How can I write trigger on a columns insert/update? > > CREATE TRIGGER mytrigger > BEFORE > INSERT OR UPDATE > OF mycolumn ON mytable You don't I'm afraid. It's not a feature that's supported yet. You have to check which column(s) were changed in your functions. It is on the TODO list though: http://www.postgresql.org/docs/faqs.TODO.html -- Richard Huxton Archonet Ltd
On Thu, 2005-05-19 at 04:35, Richard Huxton wrote: > Dinesh Pandey wrote: > > How can I write trigger on a columns insert/update? > > > > CREATE TRIGGER mytrigger > > BEFORE > > INSERT OR UPDATE > > OF mycolumn ON mytable > > You don't I'm afraid. It's not a feature that's supported yet. You have > to check which column(s) were changed in your functions. > > It is on the TODO list though: > http://www.postgresql.org/docs/faqs.TODO.html > Just to add there is someone working on this for 8.1, hopefully it will get done. Also the workaround is to create a regular trigger and then do a check in the function IF NEW.mycol <> OLD.mycol THEN... it's not quite as spiff but should do what you want. Robert Treat -- Build A Brighter Lamp :: Linux Apache {middleware} PostgreSQL