Cannot delete a row when the trigger is enabled - postgresql

Question

Help Needed. i have a table and the respective audit table in emp schema.I was not able to delete the entry from the source table when the trigger is enabled.
The table is mapped to a trigger as stated below.
Below is the generic function , which i have used to audit across all the tables.
Function:
============
CREATE OR REPLACE FUNCTION emp.fn_entry_audit()
RETURNS trigger
LANGUAGE plpgsql
AS $function$
declare
col_name text:='';
audit_table_name text := TG_TABLE_NAME || '_audit';
begin
if TG_OP = 'UPDATE' or TG_OP = 'INSERT' THEN
EXECUTE format('INSERT INTO emp.%1$I SELECT ($1).*,'''||TG_OP||'''',audit_table_name) using NEW;
else
EXECUTE format('INSERT INTO emp.%1$I SELECT ($1).*,'''||TG_OP||'''',audit_table_name) using old;
end if;
return new;
END $function$
Trigger creation
=================
create trigger trig_anish before insert or delete or update on emp.test_empname for each row execute procedure acaas.fn_entry_audit()
Table
======
create table emp.test_empname(id int4,fname varchar(300) not null,lname varchar(400),salary int4,last_modified_dt timestamp);
create table emp.test_empname_audit(id int4,fname varchar(300) not null,lname varchar(400),salary int4,last_modified_dt timestamp,modified_type varchar(10));
The difference between the two is modified_type column, which will mention whether the data is of insert, update or delete(TG_OP from above function).
now when i insert the values in emp.test_empname, it is getting inserted correctly in emp.test_empname_audit.
select * from emp.test_empname;
emp.test_empname:
==================
id fname lname salary last_modified_dt
===============================================================
1 stacker pentacost 1000 04-04-18
2 lyri pav 2000 04-04-18
3 TEST TEST1 1000 04-04-18
select * from emp.test_empname_audit;
id fname lname salary last_modified_dt modified_type
===============================================================
1 stacker pentacost 1000 04-04-18 INSERT
2 lyri pav 1000 04-04-18 INSERT
2 lyri pav 2000 04-04-18 UPDATE
3 TEST TEST1 1000 04-04-18 Delete
Now, the issue is whenever I perform delete on source table (test_empname), the query is executing fine, but it shows 0 rows affected.
when i query in the table select * from test_empname where id=3, it still exists.But you can see the entry in audit as delete.
I disabled the trigger and performed delete function ,it executes fine and the row gets affected.How is the trigger affecting my delete functionality.Please help!!

Answer 1

CREATE OR REPLACE FUNCTION acaas.fn_entry_audit1()
RETURNS trigger
LANGUAGE plpgsql
AS $function$
declare
col_name text:='';
audit_table_name text := TG_TABLE_NAME || '_audit';
begin
if TG_OP = 'UPDATE' or TG_OP = 'INSERT' THEN
EXECUTE format('INSERT INTO acaas.%1$I SELECT ($1).*,'''||TG_OP||'''',audit_table_name) using NEW;
return new;
else
EXECUTE format('INSERT INTO acaas.%1$I SELECT ($1).*,'''||TG_OP||'''',audit_table_name) using old;
return old;
end if;
END $function$