On Wed, Aug 16, 2006 at 01:35:47AM -0400, Harpreet Dhaliwal wrote: > I'm trying to create a trigger with the following definition: > > CREATE TRIGGER insert_price_change AFTER INSERT OR DELETE OR UPDATE ON > raw_email > FOR EACH ROW EXECUTE PROCEDURE add_one(1); > > Procedure / Function add_one has the following definition > > CREATE FUNCTION add_one(integer) RETURNS integer > AS '/usr/local/pgsql/jsb/add_one', 'add_one' > LANGUAGE C STRICT; > > function add_one is running fine. > > When I try to create the trigger insert_price_change, it throws me the > follwoing error: > > ERROR: function add_one() does not exist
Trigger functions must return type "trigger" and they must be declared with no arguments. You can pass an argument as in your CREATE TRIGGER statement but a trigger function receives its arguments differently than an ordinary function. See the Triggers chapter in the documentation, especially "Writing Trigger Functions in C":
Unless you need to use C I'd suggest using PL/pgSQL. Even if you do need to use C I'd recommend practicing with PL/pgSQL to learn the basics with a simpler language.
