I use to follow the "skype" way of accessing Postgres - to wrap everything into stored procedures.
This is minimalistic wrapper over pg module to allow just this.
If I get to it, here will be the documentation and reasoning why I think it worth doing.
Example of syntax for function returning one row:
create or replace function test ()
returns table (
"status" int,
"data" text
) as $$
begin
return query select 200::int, 'ok'::text;
end;
$$ language plpgsql security definer;