oracle触发器记录表操作

创建学生表：Create table student(sid INT primary key,sname varchar(20))

创建日志表：Create table log_sutdent(LOGID INT primary key,CONTENT VARCHAR2(20),UPDATEDATA DATE)

创建序列：Create Sequence seq

start with 1

increment by 1

minvalue 1

maxvalue 1000000

nocycle

cache 20;

创建触发器,记录对表的操作：

create or replace trigger tr_test
  before insert or update or delete on student
declare
 content varchar(20);
begin
  if inserting  then
    content:='新增';
  elsif updating then
   content:='修改';
  else
     content:='删除';
  end if;
  Insert Into log_student Values(seq.nextval,content,SYSDATE);
end tr_test;

对表的操作

update student set sname='李四' where sid=2
insert into student values(1,'小咱')
delete  from student where sid=1

select log_sutdent

 触发器：只允许在周一或周五操作Student表

create or replace trigger tr_commit
  before insert or update or delete on student 
declare
begin
  if(TO_CHAR(SYSDATE,'DY') not IN ('MON','FRI')) then
  RAISE_APPLICATION_ERROR(-20500,'非法时间修改表错误');
  end if;
end tr_commit;