表字段自增加

1.创建表

CREATE TABLE items (
id number(11) NOT NULL ,
name varchar(32) NOT NULL,
price float NOT NULL,
detail clob ,
pic varchar(64),
createtime date ,
PRIMARY KEY (id)
)

2.创建序列

create sequence items_idautoinc
minvalue 1
maxvalue 9999999999999999999999999999
start with 1
increment by 1
nocache;

3.添加数据

insert  into items(id,name,price,detail,pic,createtime) values (items_idautoinc.nextval,'笔记本',6000.0,'笔记本性能好，质量好！！！！！',NULL,to_date( '2018-02-01', 'yyyy-MM-dd'))

4.效果图

5.第二种方法就是建立一个触发器，在往表里插入数据时id自动加一

CREATE OR REPLACE TRIGGER "insert_items_idautoinc"
   BEFORE INSERT ON items
   REFERENCING OLD AS OLD NEW AS NEW FOR EACH ROW
 DECLARE
 BEGIN
   SELECT items_idautoinc.NEXTVAL INTO :NEW.ID FROM DUAL;
 END insert_items_idautoinc;

　　插入一条数据，没有id和值

insert  into items(name,price,detail,pic,createtime) values ('笔记本1',6000.0,'笔记本性能好，质量好！！！！！',NULL,to_date( '2018-02-01', 'yyyy-MM-dd'))

　　效果图