Question

如果价格涨幅超过10％，则此触发器会抛出错误。出于某种原因，我收到了PLS-00103错误。

CREATE OR REPLACE TRIGGER product_price_updt
BEFORE UPDATE ON PRODUCT
FOR EACH ROW
DECLARE
price_error VARCHAR2(100);
BEGIN
IF (:new.price > :old.price * 1.1) THEN raise price_error;
END IF;
EXCEPTION 
when price_error then ('Price increase is greater than 10%, update cancelled');
END;

这是我在编译时看到的。

Error(7,78): PLS-00103: Encountered the symbol ")" when expecting one of the following:     * & = - + < / > at in is mod remainder not rem    <an exponent (**)> <> or != or ~= >= <= <> and or like like2    like4 likec as between || multiset member submultiset

也许我的语法错了，错误是误导。我无法找到问题。

Answer 1

RAISE必须与EXCEPTION一起使用 - 在这里你使用VARCHAR2参数，这是一个问题。我能看到的另一个是你的异常块中你有一个字符串（'价格上涨大于10％，更新已取消'）你需要某种函数调用。我建议将你的触发器重写为：

CREATE OR REPLACE TRIGGER product_price_updt
  BEFORE UPDATE ON PRODUCT
  FOR EACH ROW
DECLARE
  price_error EXCEPTION;
BEGIN
  IF (:new.price > :old.price * 1.1) THEN
    raise price_error;
  END IF;
EXCEPTION 
  when price_error then
    DBMS_OUTPUT.PUT_LINE('Price increase is greater than 10%, update cancelled');
END product_price_updt;

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触发器的PLS-00103错误

1 个答案: