Oracle数据库多事件触发器案例

Oracle数据库多事件触发器，在Trigger Body中判断具体事件，举例：

create or replace trigger secure_emp
before
insert or update or delete on cux_employees

begin
  if (to_char(SYSDATE,'DY') IN ('星期六','星期日')) or (to_char(SYSDATE,'HH24') NOT BETWEEN '08' AND '18') then
     if deleting then
         raise_application_error(-20502,'You may delete from EMPLOYEES table only during business hours.');
     elsif inserting then
         raise_application_error(-20500,'You may insert into EMPLOYEES table only during business hours.');
     elsif updating('salary') then
         raise_application_error(-20503,'You may update SALARY only during business hours.');
     else
         raise_application_error(-20504,'You may update EMPLOYEES table only during normal hours.');
     end if;
  end if;
end;

补充：

Oracle触发器产生冲突问题（ORA-04091）的解决方案参考文档：https://wenku.baidu.com/view/a6d40c2bbd64783e09122b7d.html