Question

我的oracle表上有一个更新触发器。.但似乎不起作用。.在其中创建触发器和表的架构是HR

CREATE OR REPLACE Trigger TR_FinlStatAssetDesignation_U
BEFORE update
on FINLSTATASSETDESIGNATION FOR EACH ROW
   DECLARE
   v_AtDateTime  TIMESTAMP(3);
   v_LogOperation  NUMBER(3,0);
   v_UserName  VARCHAR2(255);
   v_AppName  VARCHAR2(255);
   SWV_error NUMBER(10,0) DEFAULT 0;
BEGIN

   begin
      select USERNAME INTO v_UserName FROM v$session  WHERE (audsid = SYS_CONTEXT('userenv','sessionid')) AND ROWNUM <=1;
      EXCEPTION
      WHEN NO_DATA_FOUND THEN
         NULL;
   end;

   SELECT program INTO v_AppName FROM v$session WHERE audsid=userenv('sessionid'); 
   if (LENGTH(v_AppName) = 0) then 
      v_AppName := 'Unknown';
   end if; 

   SELECT SYSTIMESTAMP INTO v_AtDateTime FROM dual;

   if UPDATING('FinlStatAssetDesignation') then
      RAISE_APPLICATION_ERROR(-20000,'Invalid attempt to update OID FinlStatAssetDesignation in FinlStatAssetDesignation');
      /*    
      ROLLBACK */
      return;
   end if;

   if not UPDATING('UpdDate') then
      SWV_error := 0;
      begin
         UPDATE FinlStatAssetDesignation a SET(UpdDate) =(SELECT distinct v_AtDateTime FROM dual  where a.FinlStatAssetDesignation = :NEW.FinlStatAssetDesignation)
         WHERE ROWID IN(SELECT a.ROWID FROM FinlStatAssetDesignation a where a.FinlStatAssetDesignation = :NEW.FinlStatAssetDesignation);
         EXCEPTION
         WHEN OTHERS THEN
            SWV_error := SQLCODE;
      end;
      if SWV_error <> 0 then
         /* 
ROLLBACK */
return;

在此触发器中..第二部分，即下面的触发器不起作用..请帮助....它没有更新upddate列中的时间戳

SQL> select * from finlstatassetdesignation;

FINLSTATAS FINLSTATASSETDESIGNATIONDESC                       UPDOPERATION
---------- -------------------------------------------------- ------------
UPDDATE
---------------------------------------------------------------------------
one19      anyt                                                          0
           hinh
01-JAN-17 08.00.00.000000 AM


SQL> update finlstatassetdesignation set finlstatassetdesignationdesc ='nothing';

1 row updated.

SQL> select * From finlstatassetdesignation;

FINLSTATAS FINLSTATASSETDESIGNATIONDESC                       UPDOPERATION
---------- -------------------------------------------------- ------------
UPDDATE
---------------------------------------------------------------------------
one19      nothing                                                       0
01-JAN-17 08.00.00.000000 AM

Answer 1

您要在ON INSERT触发器中完成什么？根据您的评论

我仍然可以以“ hello”用户身份插入一行。因此触发器不起作用。

您似乎想阻止添加名为HELLO的用户-但是在触发器代码中，如果找到用户名HELLO，则只需从触发器中返回即可。那什么都做不了。要向系统发出不希望INSERT继续进行的信号，必须在触发器中引发异常。例如：

CREATE OR REPLACE Trigger TR_FinlStatAssetDesignation_I
  BEFORE Insert on FINLSTATASSETDESIGNATION
BEGIN
  if USER = 'HELLO' or USER = 'SYSTEM' then
    RAISE_APPLICATION_ERROR(-20000, 'Invalid user in TR_FinlStatAssetDesignation_I');
  end if;
END TR_FinlStatAssetDesignation_I;

以这种方式引发异常将阻止INSERT继续成功完成。您的代码负责提供适当的错误处理程序。

好运。

SQL更新触发器未按预期工作

1 个答案: