Question

触发此触发器时收到错误ORA-04091：

    CREATE OR REPLACE TRIGGER SendNotifications 
       AFTER UPDATE OF penalty_amount ON Penalites
       FOR EACH ROW
   DECLARE
      phone_no number(9,0);
       BEGIN  
          SELECT PHONE_NUMBER INTO phone_no
            FROM ADRESSES
            INNER JOIN ORDERS
              ON adresses.ID_READER = orders.ID_READER
            INNER JOIN PENALITES
              ON orders.ID_ORDER = penalites.ID_ORDER
          WHERE :new.ISPAID = 'N';

          DBMS_OUTPUT.PUT_LINE('Phone numbers where selected.');
       END;
    /

我想我应该使用：new。和：老。但我不知道如何处理它。你能给我任何建议或起点吗？

Answer 1

触发器中的SELECT语句正在尝试从PENALTIES检索数据，该表是定义触发器的表。不允许这样的行触发器从定义它们的表中检索数据。您有三种选择：

删除FOR EACH ROW或
从SELECT语句中删除PENALTIES。看来这个陈述会做同等的事情：

SELECT PHONE_NUMBER FROM ADRESSES INNER JOIN ORDERS ON adresses.ID_READER = orders.ID_READER WHERE :new.ISPAID = 'N' AND orders.ID_ORDER = :new.ID_ORDER;
将此转换为复合触发器。 See this answer for details

祝你好运。

触发触发时突变表错误

1 个答案: