Question

我在创建以下触发器时遇到错误：有任何线索如何解决？

13 32 PLS-00103：遇到下列情况之一时遇到符号“WHEN”:. （* @％＆amp; = - +＆lt; /＆gt; at in是mod的余数不是rem然后＆lt;＆gt;或！=或〜=＆gt; =＆lt; =＆lt;＆gt;和/或类似

create or replace trigger "CONVEYANCE_REQUEST_T3"
BEFORE
insert or update on "CONVEYANCE_REQUEST"
for each row
begin

CASE 
when :NEW.REGULAR_TRAVEL_MODE = '2 WHEELER' THEN
 BEGIN
     CASE
         when :NEW.WAY_TYPE = 'ONE WAY' THEN 
              SELECT RATE_PER_KM * :NEW.REGULAR_DISTANCE_ONEWAY * 1 INTO  :NEW.REGULAR_AMOUNT FROM CONVEYANCE_RATE WHERE TRAVEL_MODE = :NEW.REGULAR_TRAVEL_MODE;
         WHEN :NEW.WAY_TYPE ='TWO WAY' THEN
              SELECT RATE_PER_KM * :NEW.REGULAR_DISTANCE_ONEWAY * 2 INTO :NEW.REGULAR_AMOUNT FROM CONVEYANCE_RATE WHERE TRAVEL_MODE = :NEW.REGULAR_TRAVEL_MODE;
     END CASE;
 END;
when :NEW.REGULAR_TRAVEL_MODE WHEN = '4 WHEELER' THEN
 BEGIN
     CASE
        when :NEW.WAY_TYPE = 'ONE WAY' THEN 
              SELECT RATE_PER_KM * :NEW.REGULAR_DISTANCE_ONEWAY * 1 INTO :NEW.REGULAR_AMOUNT FROM CONVEYANCE_RATE WHERE TRAVEL_MODE = :NEW.REGULAR_TRAVEL_MODE;
         WHEN :NEW.WAY_TYPE ='TWO WAY' THEN
              SELECT RATE_PER_KM * :NEW.REGULAR_DISTANCE_ONEWAY * 2 INTO   :NEW.REGULAR_AMOUNT FROM CONVEYANCE_RATE WHERE TRAVEL_MODE = :NEW.REGULAR_TRAVEL_MODE;
     END CASE;
 END;


END CASE;
END;

Answer 1

你不能some_variable := (SELECT some_column FROM ...)。而是在查询中执行所有计算并使用SELECT ... INTO分配结果。例如，以下是如何对:NEW.REGULAR_AMOUNT进行第一次分配：

SELECT RATE_PER_KM * :NEW.REGULAR_DISTANCE_ONEWAY * 1
  INTO :NEW.REGULAR_AMOUNT
  FROM CONVEYANCE_RATE ...

我会留给你处理其余的案件。

Answer 2

以下行还有其他时间..

when :NEW.REGULAR_TRAVEL_MODE WHEN = '4 WHEELER' THEN

尝试以下代码

when :NEW.REGULAR_TRAVEL_MODE = '4 WHEELER' THEN

使用案例分配价值

2 个答案: