oracle创建主键自增字段

创建表

create table LoginUser

(

  Pid number(6) primary key,

  username varchar(20) not null,

  userpwd varchar(20) not null,

  usertype varchar(12) not null

);

  创建序列

create sequence LoginUser_seq

increment by 1

start with 1

nomaxvalue 

nominvalue

nocache

创建触发器其中一定要注意new.pid这个地方

create or replace trigger tr_user

before insert on loginuser

for each row

  begin

    select LoginUser_seq.nextval into :new.pid from dual;

    end;

    

  执行sql插入语句

insert into LoginUser(username,Userpwd,Usertype) values('jack','123','管理员');

insert into LoginUser(username,Userpwd,Usertype) values('jney','123','普通用户');

  查看执行结果

select * from loginuser