数据库操作

//创建数据库

create table if not exists user

(

userid integer primary key autoincrement,

username varchar(128),

classid integer

)

//插入数据库对象

insert into user

(username,classid)

values

('王五',3)

//按格式显示数据库

select userid as 用户序列号, username as 用户名,classid as 班级号 from user 

//更新数据库

update user set classid = 3 where userid = 1

//删除数据库内部数据

delete from user where classid = 2