mybatis配置

1.加入mybatis的jar包
2.orm:操作数据库（crud->连接）
  2.1编写配置文件mybatis.xml放到src下面
     2.1.1配置JDBC的数据源



"http://mybatis.org/dtd/mybatis-3-config.dtd">






value="jdbc:mysql://localhost/jingteng?useUnicode=true&characterEncoding=utf-8" />






2.2.2加入映射文件地址,相当于配置接口类UserMapper






3.配置UserMapper.xml文件 (主要做添加修改删除查询）

     
insert into userinfo(id,username,userage,useraddress)
values(#{任意名字},#{任意名字},#{任意名字},#{任意名字})




--------------------------------

"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

     
insert into userinfo(userid,userpwd,userage)
values(#{userid},#{userpwd},#{userage})




------------------------------------------
4.添加，修改，删除，按主键查询，查询所有：


UserinfoMapper.java:


package mapper;


import java.util.List;


import domain.Userinfo;


public interface UserinfoMapper {
//添加
public void saveUserinfo(Userinfo userinfo);
//修改
public void updateUserinfo(Userinfo userinfo);
//删除
public void deleteUserinfo(String userid);
//按住键查询
public Userinfo getUserinfo(String userid);
//查询集合
public List getUserinfos();
}


---------------------------------------------
UserinfoMapper.xml:



  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">





insert into userinfo(userid,userpwd,userage)
values(#{userid},#{userpwd},#{userage})



update userinfo set userpwd = #{userpwd},userage = #{userage} 
where userid = #{userid}



delete from userinfo where userid = #{userid}



select * from userinfo where userid =#{userid}









select * from userinfo


--------------------------------------------------------------------------
测试  Test.java:


package test;


import java.io.IOException;
import java.io.Reader;
import java.util.List;


import mapper.UserinfoMapper;


import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;


import domain.Userinfo;


public class Test {
public static void main(String[] args) throws IOException {
Reader reader = Resources.getResourceAsReader("mybatis.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
SqlSession session = sqlSessionFactory.openSession();

//添加
Userinfo userinfo = new Userinfo();
userinfo.setUserid("9");
userinfo.setUserpwd("9999");
userinfo.setUserage(2799);

//实例化mapper类
UserinfoMapper mapper = session.getMapper(UserinfoMapper.class);

//mapper.saveUserinfo(userinfo);//添加
//mapper.updateUserinfo(userinfo);//修改
//mapper.deleteUserinfo("9");//删除

//按主键查询
// Userinfo u2 = mapper.getUserinfo("888");
// System.out.println(u2.getUserage());
//

//查询所有
List userinfos = mapper.getUserinfos();
System.out.println(userinfos.size());
session.commit();
}
}