Error: Relation "abc.emp_audit" does not exist. when i add schema name in all objects. it was working fine without schema - sql

Question

CREATE TABLE abc.emp
(
empname TEXT NOT NULL,
salary INTEGER
);
CREATE TABLE abc.emp_audit
(
operation CHAR(1) NOT NULL,
stamp TIMESTAMP NOT NULL,
userid TEXT NOT NULL,
empname TEXT NOT NULL,
salary INTEGER
);
CREATE FUNCTION abc.audit()
returns TRIGGER AS $$ ...
EXECUTE format
( 'INSERT INTO %I SELECT ''I'', current_timestamp, %L, ($1::%I.%I).*',
tg_argv[0], CURRENT_USER, tg_table_schema, tg_table_name ) using new;
... $$;
CREATE TRIGGER emp_audit_trig after
INSERT
OR
UPDATE
OR
DELETE
ON abc.emp FOR each row
EXECUTE FUNCTION
abc.audit('abc.emp_audit');
I got error : Relation "abc.emp_audit" does not exist . How to correct this issue when schema added in tables ad audit tables, functions, and triggers arguments.

Answer 1

You'd have to use two parameters, one for the schema and one for the table. In the trigger function, use
EXECUTE
format(
'INSERT INTO %I.%I SELECT ''I'', current_timestamp, %L, ($1::%I.%I).*',
TG_ARGV[0], TG_ARGV[1],
current_user,
TG_TABLE SCHEMA, TG_TABLE NAME
) USING NEW;
Then define the trigger as
CREATE TRIGGER ... EXECUTE FUNCTION abc.audit('abc', 'emp_audit');

Answer 2

An alternative to the one proposed by #Laurenz Albe is to stick to a single parameter and then split it before creating the INSERT statement, e.g
CREATE FUNCTION abc.audit() RETURNS TRIGGER AS $$
DECLARE
tbname TEXT := (string_to_array(tg_argv[0],'.'))[1];
schname TEXT := (string_to_array(tg_argv[0],'.'))[2];
BEGIN
-- rest of your code ...
EXECUTE format('INSERT INTO %I.%I SELECT ''I'', current_timestamp, %L, ($1::%I.%I).*',
tbname,schname,CURRENT_USER,tg_table_schema,tg_table_name ) USING NEW;
-- rest of your code ...
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
CREATE TRIGGER emp_audit_trig AFTER INSERT OR UPDATE OR DELETE
ON abc.emp FOR EACH ROW EXECUTE FUNCTION abc.audit('abc.emp_audit');
Demo: db<>fiddle