Question

错误在哪里，在我看来很好，但是我得到了错误。

我尝试过，将旧到旧引用为新。

也许错误在于变量。

SQL> create or replace trigger before_delete
      2         before delete
      3     on accounts
      4  declare 
      5     v_username varchar2(20);
      6   begin
      7     select user into v_username
      8     from dual;
      9     insert into accounts_history
     10     (
     11         id, 
     12             new_name,
     13             old_name,
     14             new_amount,
     15             old_amount,
     16             change_date,
     17         delted_by
     18     )
     19     values
     20     (      
     21         :old.acc_id
     22         :old.acc_name
     23         :old.acc_name
     24         :old.acc_amount
     25         :old.acc_amount
     26         sysdate,
     27         v_username
     28   );
     29   end;
     30   /
        insert into accounts_history
            *
    ERROR at line 9:
    ORA-04082: NEW or OLD references not allowed in table level triggers

Answer 1

这里的错误似乎很清楚-您有一个语句级触发器，而不是行级触发器（没有for each row子句）和you can't use the old/new pseudorecords at statement level。

看起来实际上是您想要的，所以需要添加该子句：

create or replace trigger before_delete
before delete
on accounts
for each row
begin
    insert into accounts_history
    (
        id,
        new_name,
        old_name,
        new_amount,
        old_amount,
        change_date,
        delted_by
    )
    values
    (
        :old.acc_id,
        :old.acc_name,
        :old.acc_name,
        :old.acc_amount,
        :old.acc_amount,
        sysdate,
        user
   );
end;
/

您无需通过对偶查询即可将user放入变量中，可以直接对其进行赋值；但是您根本不需要该变量；您可以直接在user子句中引用values调用。

删除前日志触发错误，我找不到错误

1 个答案: