The following bug has been logged on the website:
Bug reference: 6551
Logged by: Adam Buraczewski
Email address: [email protected]
PostgreSQL version: 9.1.3
Operating system: Linux (Fedora 16)
Description:
Hi!
I have just found strange behaviour of PL/pgSQL in case of using OUT
parameters and GET DIAGNOSTICS var = ROW_COUNT (PostgreSQL 9.1.3). Here is a
self-contained example:
create table t (c integer);
create function p(out x1 integer, out x2 integer, out x3 integer)
as $$
begin
insert into t values (1);
get diagnostics x1 = row_count;
insert into t values (2);
get diagnostics x2 = row_count;
insert into t values (3);
get diagnostics x3 = row_count;
end;
$$ language plpgsql;
select * from p();
x1 | x2 | x3
----+----+----
| 1 | 1
Why x1 is NULL instead of the value 1? I found a workaround: declare a
temporary variable inside the function then assign ROW_COUNT to that
variable and then assign temporary variable to the OUT parameter. It works
but probably is not the solution one could expect:
create function p_workaround(out x1 integer, out x2 integer, out x3
integer)
as $$
declare
tmpvar integer;
begin
insert into t values (1);
get diagnostics tmpvar = row_count;
x1 := tmpvar;
insert into t values (2);
get diagnostics x2 = row_count;
insert into t values (3);
get diagnostics x3 = row_count;
end;
$$ language plpgsql;
select * from p_workaround();
x1 | x2 | x3
----+----+----
1 | 1 | 1
Best regards,
Adam
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