ios开发之数据库FMDB
选择以下按钮进行编辑
数据库的创建
create table if not exists StudentInfo(sid integer,username vachar(20),password vachar(20),scare vachar(20))
插入
insert into StudentInfo(sid,username,password,score)
values(1501,'zhangsan','123','100’)
查询
select "from StudentInfo”;
查询指定字段
select username from StudentInfo;
查询指定条件的信息
select *from StudentInfo where username=‘zhangsan’
根据指定多个条件查询
select *from StudentInfo where username='zhangsan' and password=‘123'
默认升序排序
select *from StudentInfo order by score
降序排序
select *from StudentInfo order by score desc
统计行数
select count(*)from StudentInfo
修改数据
update StudentInfo set score='100' where username='zhangsan’;
删除数据
delete from StudentInfo where sid='1502'