1、创建表
create table Test_Increase( userid number(10) NOT NULL primary key, /*主键,自动增加*/ username varchar2(20) );
2、创建自动增长序列
CREATE SEQUENCE TestIncrease_Sequence INCREMENT BY 1 -- 每次加几个 START WITH 1 -- 从1开始计数 NOMAXVALUE -- 不设置最大值 ,设置最大值:maxvalue 9999 NOCYCLE -- 一直累加,不循环 CACHE 10;
3、创建触发器
CREATE TRIGGER Test_Increase BEFORE insert ON Test_Increase FOR EACH ROW /*对每一行都检测是否触发*/ begin select TestIncrease_Sequence.nextval into:New.userid from dual; end; / /*退出sqlplus行编辑*/
4、提交
commit
;
5、测试
insert into Test_Increase(Username) values('test');
转自:http://www.cnblogs.com/lizhishugen/archive/2012/11/29/2794692.html