oracle 通过序列实现某字段自增

-- 创建表
create table items(
       id int primary key,
       name varchar(32) not null,
       price int not null,
       detail varchar(100),
       pic varchar(512),
       createtime date

);

-- 创建序列
create sequence sq_items
-- 自增步长
increment by 1
-- 始值
start with 1
-- 没有最大值
nomaxvalue
-- 不循环
nocycle; 

--创建触发器，将序列与表的字段关联起来，并实现自增
create or replace trigger itmes_trig
before insert on items
for each row
declare
begin
 select sq_items.nextval into :new.id from dual;
end items_trig;

insert into items (name,price) values('lf',12);
insert into items (name,price) values('tl',22);
insert into items (name,price) values('lt',22);
select * from items;