oracle插入修改触发器改变时间

CREATE OR REPLACE TRIGGER "MYUSAP".TR_USAP_USER_ROLE_INDATE_TIME    before  INSERT OR UPDATE ON TB_USAP_USER_ROLE_LINK FOR EACH ROWBEGIN     IF INSERTING THEN        :NEW.link_indate := SYSDATE;    ELSIF UPDATING then        :NEW.link_indate := SYSDATE;    END IF;    END;