procedures and transactions

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);

NOTICE: current isolation level: read committed
NOTICE: current txid: 111490
NOTICE: ---
ERROR: invalid transaction termination