select/display last inserted serial id in postgres

Question

in sql server I do like this:

insert into foo(name) values(\'bob\')
select @@identity;

so I get a query/scalar result displayed

how to

Answer 1

It would be

GET DIAGNOSTICS YourParam = RESULT_OID;

See here http://www.postgresql.org/docs/8.2/static/plpgsql-statements.html scroll down to 37.6.6. Obtaining the Result Status

asker edit: I tried this:

create or replace function aaa() returns int as $$ 
declare 
a int;
begin
insert into oameni values(default, 'aaa');
get diagnostics a = result_oid;
return a;
end;
$$ language plpgsql;

it always returns 0, you know what's wrong here?