sql中的更新触发器

Question

我想在特定行更新时实现触发器。

offer 表中有一个名为 pno 的属性。

create table logFile
(
    pno int primary key, 
    user_name varchar(100), 
    date_chan date, 
    old_Price int, 
    new_Price int
);

create or replace trigger update_price_property 
   AFTER UPDATE OF price ON offer 
   IF pno = 80 // this won't work, how can I add this condition?
   BEGIN
     insert into logFile values (:old.pno, user, sysdate, :old.price, :new.price);
   END;
/

Answer 1

您可以将其表述为insert：

BEGIN
    insert into logFile 
        select :old.pno, user, sysdate, :old.price, :new.price
        from dual
        where :old.pno = 80;  -- or is this :new.pno?
END;

当然，您也可以使用if 条件。