orcle中触发器的使用
通过触发器和sequence实现id的自动增加
一,创建表格
create table user_test(
id number not null,
age number,
name varchar2(30)
);
二,建立sequence
create sequence user_seq
minValue 100
maxValue 999999
start with 100
increment by 1
cache 20;
三,创建触发器
create or replace trigger user_trigger
before insert on user_test for each row
begin
select user_seq.nextval into:new.id from dual;
end user_trigger;
注意:new.id的id为user_test表格中的列,dual;和user_trigger;中的;必须有
四,测试
insert into user_test(age,name) values(28,'Jack');
insert into user_test(age,name) values(27,'Tom');
insert into user_test(age,name) values(29,'Rose');
select * from user_teset
五,测试结束
drop sequence user_seq;
drop trigger user_trigger;
drop table user_test;