oracle插入或更新某一个指定列来执行触发器

表结构：

create table TZ_GXSX

(

  ID              VARCHAR2(15),

  PROJECT         VARCHAR2(50),

  TXYX            NUMBER(22) default '0',

  CDATE           DATE,

  RISK            VARCHAR2(10),

  DEGREE          VARCHAR2(10),

  PROB            VARCHAR2(10),

  PRESSURE_LEVEL  VARCHAR2(20),

  NETWORKDIVISION VARCHAR2(20),

  AUTHOR          VARCHAR2(20),

  INP_DATE        DATE

)

直接更新：

create or replace trigger GXSX_trg

  before update ON TZ_GXSX

  FOR EACH ROW



BEGIN

 :new.INP_DATE:=sysdate;

EXCEPTION

  WHEN OTHERS THEN

    RAISE;

END GXSX_trg;

 排除指定列名"CDATE" 来执行更新:

create or replace trigger GXSX_trg

  before update ON TZ_GXSX

  FOR EACH ROW



BEGIN

 if updating('CDATE')=false

   then

 :new.INP_DATE:=sysdate;

 end if;

EXCEPTION

  WHEN OTHERS THEN

    RAISE;

END GXSX_trg;