On 2/19/19 12:31 PM, Rob Nikander wrote:
Hi,
I’m trying to understand how procedures work with transactions. I tried the code below - it’s a simple procedure to print some notices and commit a transaction. If I call it from psql after a `begin`, then it gives an error. What does that error mean? Are procedures not allowed to commit/rollback if they are called within in an outer transaction?
Also, I tried putting a `start transaction` command in the procedure. I got another error: `unsupported transaction command in PL/pgSQL`. Are procedures not allowed to start transactions? Or is there another command?
thanks,
Rob
create or replace procedure t_test(n integer)
as $$
begin
raise notice 'current isolation level: %', (select current_setting('transaction_isolation'));
raise notice 'current txid: %', (select txid_current());
raise notice '---';
commit;
raise notice 'current isolation level: %', (select current_setting('transaction_isolation'));
raise notice 'current txid: %', (select txid_current());
end;
$$ language plpgsql;
psql> begin;
psql> call t_test(1);
Don't use the begin;
call t_test(1);
NOTICE: current isolation level: read committed
NOTICE: current txid: 592
NOTICE: ---
NOTICE: current isolation level: read committed
NOTICE: current txid: 593
CALL
A function already starts in a transaction.
NOTICE: current isolation level: read committed
NOTICE: current txid: 111490
NOTICE: ---
ERROR: invalid transaction termination
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
