轻量级sqlite是增删改查

--创建数据库

create database ios

--使用数据库

use ios

--创建数据表

create table student

(

stuid int primary key autoincrement,

stuname varchar(20),

stupwd varchar(20)

)

--查询所有信息

select * from student

--增加信息

insert into student(stuname,stupwd)

values ('lisi','123456')

--修改

update student set stuname = '李四'

where stuid = 1

update student set stuname = '李四',stupwd='Sd123'

where stuid = 1

--删除

delete from student where stuid=1

查询

1、查询所有信息

select * from student

2、查询表中的行数

select count(*) from student

3、降序排列

select * from student order by stuid desc

升序排列

select * from student order by stuid asc

4、分组

select count(*)from student group by stuname