create table t_(
user_id number not null primary key,
user_name varchar2(30),
credits number,
user_password varchar2(32),
last_visit date,
last_ip varchar2(23)
)
- 为这个表创建序列
create sequence T_SEQ
minvalue 1
maxvalue 999999999999999999999999999
start with 21
increment by 1
cache 20;
- 创建一个触发器
create or replace trigger ttr
before insert on t
for each row
begin
select t_seq.nextval into :new.id from dual;
end t_tr;
- 测试
insert into t_user values(null,’xiaoming’,123,’111’,sysdate,’192.168.37.132’);insert into t_user values(6,124,’192.168.37.132’);select * from t_user
