Question

表1：客户

cust_no | cust_credbal | cred_status
表2：customer_credittopup

cust_no | trans_amount

我有上面的两个表，在插入Table2以更新Table1之后，我写了一个更新触发器。因此，在Table1中添加cust_credbal + cust_credbal中的Tabl1中的新值后，trans_amount Table2中的金额会更新。如何在更新后添加if语句以检查cust_credbal是否为＆gt;超过20，然后cred_status被设置为'有效'，否则'已排除'

我的触发器显示此错误：第8行出错：PLS-00049：错误的绑定变量'NEW.CUST_CREDITBAL'

CREATE OR REPLACE TRIGGER after_insert_credittopup
AFTER INSERT ON customer_credittopup
FOR EACH ROW 
DECLARE 
  credit number(11);
BEGIN
  UPDATE customers
     SET cust_creditbal=cust_creditbal +:new.trans_amount
   WHERE cust_no=:new.cust_no;

  SELECT Cust_creditbal INTO credit 
    FROM customers WHERE cust_no=:new.cust_no;

  IF(:new.cust_creditbal>0) THEN
    UPDATE customers
       SET Cust_credstatus='Valid'
     WHERE cust_no=:new.cust_no;
  end if;
end;
/

Answer 1

这里似乎只需要1个更新声明：

UPDATE customers
SET cust_creditbal=cust_creditbal +:new.trans_amount,
Cust_credstatus = CASE WHEN cust_creditbal +:new.trans_amount > 0 THEN 'Valid'
 ELSE 'Invalid' 
 --or if you don't want to change status in such case just put 
 --ELSE Cust_credstatus 
 END
 WHERE cust_no=:new.cust_no;
 --SELECT Cust_creditbal INTO credit FROM customers WHERE cust_no=:new.cust_no;
 --IF(:new.cust_creditbal>0) THEN
 --UPDATE customers
 --SET Cust_credstatus='Valid'
 --WHERE cust_no=:new.cust_no;

Answer 2

NEW.CUST_CREDITBAL与cust_credbal

不符

在Oracle触发器中使用if语句

2 个答案: