From: | Victor Yegorov <vyegorov(at)gmail(dot)com> |
---|---|
To: | pgsql-general <pgsql-general(at)postgresql(dot)org> |
Subject: | Unexpected results from CALL and AUTOCOMMIT=off |
Date: | 2024-06-03 14:41:38 |
Message-ID: | CAGnEboiRe+fG2QxuBO2390F7P8e2MQ6UyBjZSL_w1Cej+E4=Vw@mail.gmail.com |
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Greetings.
I am observing the following results on PostgreSQL 15.7
First, setup:
create table t_test(x bigint);
insert into t_test values(0);
create or replace function f_get_x()
returns bigint
language plpgsql
stable
as $function$
declare
l_result bigint;
begin
select x into l_result from t_test;
--raise notice 'f_get_x() >> x=%', l_result;
--raise notice 'f_get_x() >> xact=%', txid_current_if_assigned();
return l_result;
end;
$function$;
create or replace procedure f_print_x(x bigint)
language plpgsql
as $procedure$
begin
raise notice 'f_print_x() >> x=%', x;
--raise notice 'f_print_x() >> xact=%', txid_current_if_assigned();
end;
$procedure$;
Now, the case:
\set AUTOCOMMIT off
do
$$ begin
--raise notice 'do >> xact=%', txid_current_if_assigned();
update t_test set x = 1;
--raise notice 'do >> xact=%', txid_current_if_assigned();
raise notice 'do >> x=%', f_get_x();
--raise notice 'do >> xact=%', txid_current_if_assigned();
call f_print_x(f_get_x());
end; $$;
NOTICE: do >> x=1
NOTICE: f_print_x() >> x=0
DO
I don't understand why CALL statement is not seeing an updated record.
With AUTOCOMMIT=on, all goes as expected.
I tried to examine snapshots and xids (commented lines), but they're always
the same.
Can you explain this behavior, please? Is it expected?
--
Victor Yegorov
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