--
-- acs_message__message_p/1
--
create or replace function acs_message__message_p(
  integer
) returns bool as $$

declare
    p_message_id          alias for $1;
    v_check_message_id  integer;
begin
    select count(message_id) into v_check_message_id
        from acs_messages where message_id = p_message_id;

    if v_check_message_id <> 0 then
        return 't';
    else
        return 'f';
    end if;
end;$$ language plpgsql;