--建表语句create table student(id number(9),name varchar2(64),age number(5));create table class(id number(9),name varchar2(64),teacherid number(9),studentid number(9));create table teacher(id number(9),name varchar2(64),age number(5)); --学生信息 insert into student values(1,‘yangml‘,23); insert into student values(2,‘zhangj‘,23); insert into student values(3,‘zhulj‘,26); insert into student values(4,‘chenglp‘,26); --老师信息 insert into teacher values(1,‘yangls‘,33); insert into teacher values(2,‘zhangls‘,33); insert into teacher values(3,‘zhuls‘,33); insert into teacher values(4,‘chenls‘,33); --班级信息 insert into class values(1,‘一年级‘,1,1); insert into class values(2,‘二年级‘,2,2); insert into class values(3,‘三年级‘,3,3); insert into class values(4,‘四年级‘,4,4); --删除触发器 create or replace trigger trigdel before delete on class for each row declare -- local variables here begin delete from teacher where teacher.id=:old.id; delete from student where student.id=:old.id; end trigdel; --测试删除 delete from class; select * from class; select * from student; select * from teacher;
简单入门的Oracle触发器使用
时间: 2024-10-28 16:25:59