IF IN_DN_NUMBER IS NOT NULL THEN     SELECT COUNT(*) INTO V_HAS FROM SALEFROMSTORE WHERE ORDERID = IN_DN_NUMBER;    IF V_HAS = 0 THEN        OU_RETURN := ‘ERROR‘;        OU_MSG := ‘您保存的交货单已经不存在，请确认后再保存！‘;        RETURN;   --EXIT; 这个是不返回直接退出    END IF;END IF;