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：

 1 create or replace trigger secure_emp
 2 before
 3 insert or update or delete on cux_employees
 4 
 5 begin
 6   if (to_char(SYSDATE,'DY') IN ('星期六','星期日')) or (to_char(SYSDATE,'HH24') NOT BETWEEN '08' AND '18') then
 7      if deleting then
 8          raise_application_error(-20502,'You may delete from EMPLOYEES table only during business hours.');
 9      elsif inserting then
10          raise_application_error(-20500,'You may insert into EMPLOYEES table only during business hours.');
11      elsif updating('salary') then
12          raise_application_error(-20503,'You may update SALARY only during business hours.');
13      else
14          raise_application_error(-20504,'You may update EMPLOYEES table only during normal hours.');
15      end if;
16   end if;
17 end;