1建立數據表
Code
create table Test_Increase(
userid number(10) primary key, /*主鍵，自動增加*/
username varchar2(20)
);
2創建自動增長序列
CREATE SEQUENCE TestIncrease_Sequence
INCREMENT BY 1 -- 每次加幾個
START WITH 1 -- 從1開始計數
NOMAXVALUE -- 不設置最大值
NOCYCLE -- 一直累加，不循環
CACHE 10;
3創建觸發器
CREATE TRIGGER Test_Increase BEFORE
insert ON Test_Increase FOR EACH ROW
begin
select TestIncrease_Sequence.nextval into:New.userid from dual;
end;
4 提交
commit;
5 測試
反復執行如下語句:
insert into Test_Increase(Username) values('test')
6 查看插入結果:
userid username
1 test
2 test
3 test
4 test
5 test
6 test
7 test
8 test
9 test