mysql自动增长字段 auto_increment

auto_increment设置mysql int型并且主键字段为自动增长字段。

如：

建表

create table tang

(

id int auto_increment,

name varchar(20) not null,

password varchar(20)

);

插入数据

insert into tang(name,password) values('tang1','tang');

insert into tang(name,password) values('tang2','tang');

insert into tang(name,password) values('tang3','tang');

insert into tang(name,password) values('tang4','tang');

insert into tang(name,password) values('tang'5,'tang');