The technical reference gives an example of a trigger on a table - employee
Just to test this, I have created the following table,
CREATE TABLE employee
(name VARCHAR(30),
age int4,
state VARCHAR(2),
manager VARCHAR(3),
adult VARCHAR(3));
The I created a simple Function, as follows :
CREATE FUNCTION trig_insert_update_check_emp() RETURNS opaque AS '
The "opaque" type has been split into several different ones, if you're using a recent version of PG, you'll want "RETURNS trigger".
[snip]
Now, when I execute the following :
INSERT INTO employee (name,age,state,manager) VALUES ('sean',29,'tx','yes');
I get :
ERROR fmgr_info function 6264440 cache lookup failed
This usually means you redefined something - PG isn't smart enough (yet) to re-check all the dependencies in something like this. I'd guess you dropped/recreated the function after defining the trigger, yes?
The solution in older versions is to put the CREATE FUNCTION and CREATE TRIGGER in the same file so that you drop/recreate both together.
HTH -- Richard Huxton Archonet Ltd
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