Oracle數據庫使用觸發器記錄表數據修改記錄

--日誌記錄表
CREATE TABLE T_LOG
(
  RID      VARCHAR2(32 BYTE),
  NAME      VARCHAR2(1000 BYTE),
  RQ        DATE      DEFAULT sysdate,
  OLDVALUE  VARCHAR2(255 BYTE),
  NEWVALUE  VARCHAR2(255 BYTE)
);

CREATE INDEX IDX_T_LOG_RID ON T_LOG (RID)；

--目標表
CREATE TABLE T_TARGET
(
  id char(32 BYTE),
  NAME      VARCHAR2(20 BYTE),
  salary        number,
  birthday date
);

alter table T_TARGET  add constraint  primary key (id);

--觸發器

CREATE OR REPLACE TRIGGER TR_TARGET_MODIFYLOG
AFTER UPDATE
ON T_TARGET
REFERENCING NEW AS New OLD AS Old
FOR EACH ROW
DECLARE
BEGIN
  if :new.birthday<>:old.birthday 
    or nvl2(:new.birthday,1,0)+nvl2(:old.birthday,1,0)=1 
  then 
  	 insert into T_LOG (rid,name,newvalue,oldvalue)
  	 		values(:new.id,'生日',
  	 		  to_char(:new.birthday,'yyyy-mm-dd'),
  	 		  to_char(:old.birthday,'yyyy-mm-dd'));
  end if;
  if :new.name<>:old.name 
    or nvl2(:new.name,1,0)+nvl2(:old.name,1,0)=1 
  then 
  	 insert into t_log (rid,name,newvalue,oldvalue)
  	 		values(:new.id,'姓名',:new.name,:old.name);
  end if;
  if :new.salary<>:old.salary 
    or nvl2(:new.salary,1,0)+nvl2(:old.salary,1,0)=1 
  then 
  	 insert into t_log (rid,name,newvalue,oldvalue)
  	 		values(:new.id,'工資',:new.salary,:old.salary);
  end if;
END TR_TARGET_MODIFYLOG;
/