loggin postgresql when others exception - postgresql

Question

Database: RDS PostgreSQL 12
I have a simeple proc that errors out. When it errors out I would like to log a record of it and then raise the exception. However I can only get it to do one of those things. I can either get it to log the error or I can raise the exception. I've tried both inserting the record directly from the exception block or by calling a proc that will insert the record into the table. How can I get it to do both? I'll post the code for the two blocks below. Any help would be appreciated!
CREATE OR REPLACE PROCEDURE error_test_prc ()
LANGUAGE plpgsql
AS $body$
DECLARE
var1 int;
BEGIN
SELECT 10/0 INTO var1;
EXCEPTION
WHEN OTHERS THEN
--INSERT INTO mdm_raw.raw_err_msg(msg_date, msg) VALUES(current_date, 'test');
CALL mdm_raw.error_logging_prc('this is a different proc test');
RAISE EXCEPTION 'Caught in Block 1 %', SQLERRM;
END;
$body$
CREATE OR REPLACE PROCEDURE error_logging_prc (msg_text text)
LANGUAGE plpgsql
AS $body$
DECLARE
var1 int;
BEGIN
INSERT INTO mdm_raw.raw_err_msg(msg_date, msg) VALUES(current_date, msg_text);
EXCEPTION
WHEN OTHERS THEN
RAISE EXCEPTION 'Error Caught in error_logging_prc %', SQLERRM;
END;
$body$

Answer 1

The only known way to achieve that is to use the dblink extension to create a new connection from the database to itself. You can write your log message via dblink and commit it, then throw the error that will roll back the current transaction.

Answer 2

You can accomplish this by rollback on the current transaction, then insert and commit your log. See lines marked with --<<<<< in your procedure below. Another would be setting up a dblink.
CREATE OR REPLACE PROCEDURE error_test_prc ()
LANGUAGE plpgsql
AS $body$
DECLARE
var1 int;
BEGIN
SELECT 10/0 INTO var1;
EXCEPTION
WHEN OTHERS THEN
declare --<<<<<<
msg text --<<<<<<
begin --<<<<<<
msg = sqlerrm; --<<<<<<
rollback; --<<<<<<
CALL mdm_raw.error_logging_prc('this is a different proc test');
RAISE EXCEPTION 'Caught in Block 1 %',msg;
end ;
END;
$body$
CREATE OR REPLACE PROCEDURE error_logging_prc msg_text text)
LANGUAGE plpgsql
AS $body$
DECLARE
var1 int;
BEGIN
INSERT INTO mdm_raw.raw_err_msg(msg_date, msg) VALUES(current_date, msg_text);
commit; --<<<<<<
EXCEPTION
WHEN OTHERS THEN
RAISE EXCEPTION 'Error Caught in error_logging_prc %', SQLERRM;
END;
$body$