The PL/pgSQL page on triggers (
https://www.postgresql.org/docs/16/plpgsql-trigger.html ) contains the
following example (I'm excerpting only the essential parts here):
Example 43.4. A PL/pgSQL Trigger Function for Auditing
...
CREATE TABLE emp_audit(
operation char(1) NOT NULL,
stamp timestamp NOT NULL,
userid text NOT NULL, -- <= COLUMN IN QUESTION
empname text NOT NULL,
salary integer
);
CREATE OR REPLACE FUNCTION process_emp_audit() RETURNS TRIGGER AS
$emp_audit$
BEGIN
--
-- Create a row in emp_audit to reflect the operation performed
on emp,
-- making use of the special variable TG_OP to work out the
operation.
--
IF (TG_OP = 'DELETE') THEN
INSERT INTO emp_audit SELECT 'D', now(), user, OLD.*; -- <=
ARGUMENT IN QUESTION
-- similar code with same issue follows for the other TG_OPs...
The emp_audit table has a column named 'userid', which in actual usage
(next-to-last line quoted) is populated by 'user' which seems undefined in
the context. Was that intended to be 'current_user', or am I missing
something?
