oracle 字段自动增长设计

1.创建用户数据表

CREATE TABLE USERTEST
(
 id number not null,
 uname varchar2(20) not null,
 upass varchar2(20) not null
);

2.创建自动增长的序列

create  sequence ID_SEQ
minvalue 1
maxvalue 999999999999999999999999999
start with 1
increment by 1
cache 20
order;

3.创建触发器，在执行插入操作的时候触发

create or replace trigger uid_trigger
before insert on USERTEST
for each row
begin
select id_seq.nextval into :new.id from dual;
end;

4.提交，检测一下自增长主键的设定

insert into USERTEST(uname,upass) values('张三','1233');

commit;