-- -- 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;