mybatisProxy

config.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">

  <configuration>

  <!-- 次属性可以指定类的全路径，同时给他一个别名  相当于（id="'class=""）
      <typeAliases >
          <typeAlias type="com.mybatis.entry.userMapper" alias="umapper"/>
      </typeAliases>
  -->  

  <!-- 默认创建此工厂 默认模式 -->
      <environments default="development">
          <environment id="development">
              <transactionManager type="JDBC" />
              <!-- 配置数据库连接信息 -->
              <dataSource type="POOLED">
                  <property name="driver" value="com.mysql.jdbc.Driver" />
                  <property name="url" value="jdbc:mysql://localhost:3306/mybatis" />
                  <property name="username" value="root" />
                  <property name="password" value="root" />
              </dataSource>
          </environment>
      </environments>

      <mappers>
          <!-- 注册userMapper.xml文件，
          userMapper.xml位于me.gacl.mapping这个包下，
                        所以resource写成me/gacl/mapping/userMapper.xml
          -->
          <mapper resource="com/mybatis/dao/userMapper.xml"/>
      </mappers>
  </configuration>

UserMapper.xml

 <?xml version="1.0" encoding="UTF-8"?>
  <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

     <!-- namespace命名空间,作用就是对sql进行分类化的管理,理解为sql隔离
         注意:使用mapper代理开发时，namespace有特殊作用
      -->

  <!--  <mapper namespace = "umapper">   -->
 <mapper namespace = "com.mybatis.dao.UserMapper">
     <!-- 通过SELECT执行数据库查询
         id:标识映射文件中的sql，称为statement的id;
             将sql语句封装在mapperStatement的对象中，所以Id称为Statement的id;
         parameterType:指定输入参数的类型,这里指定int型
         #{}:表示一个占位符;
         #{id}:其中Id表示接收输入的参数，参数名称就是Id,如果输入参数是简单类型，#{}中的参数名可以任意，可以是value或者其它名称;
         resultType:指定sql输出结果所映射的java对象类型,select指定resultType表示将单条记录映射成java对象。
     -->

     <select id = "selectById" parameterType="int" resultType="com.mybatis.entry.User">
         select * from user where id=#{id}
     </select>
     <!-- 根据用户名称模糊查询用户信息,可能返回多条数据
         resultType:指定的就是单条记录所映射的java类型;
         ${}:表示拼接sql字符串，将接收到的参数内容不加任何修饰拼接在sql中.
                 使用${}拼接sql，可能会引起sql注入
         ${value}:接收输入参数的内容，如果传入的是简单类型,${}中只能使用value
      -->

     <select id="selectUserAndYear" resultType="com.mybatis.entry.UserMore">
         select `user`.*,phone.*
         from user,phone
         where phone.phonenum = `user`.phoneNum and name=#{name};
     </select>

     <!-- 数据库字段与类属性名不一致时 -->
     <select id="selectUserAndYearMap" resultMap="UserMap" >
         select `user`.*,phone.*
         from user,phone
         where phone.phonenum = `user`.phoneNum and name=#{name};
     </select>
     <!-- 一对一的resultMap关联方式 -->
     <resultMap type="com.mybatis.entry.User" id="UserMap">
         <id column="id" property="id"/>
         <result column="name" property="name"/>
         <result column="phoneNum" property="phoneNum"/>

         <association property="phone" javaType="com.mybatis.entry.Phone">
             <id column="id" property="id"/>
             <result column="phoneNum" property="phoneNum"/>
             <result column="year" property="year"/>
         </association>
     </resultMap>

      <select id="selectUserAndQQMap" resultMap="QQMap">
         select `user`.*,qq.*
         from user,qq
         where `user`.id = qq.userId and user.name=#{name};
     </select>
     <!-- 一对多的resultMap关联方式 -->
     <resultMap type="com.mybatis.entry.User" id="QQMap">
         <id column="id" property="id"/>
         <result column="name" property="name"/>
         <result column="phoneNum" property="phoneNum"/>

         <collection property="qqs" ofType="com.mybatis.entry.QQ">
             <id column="qq_id" property="id"/>
             <result column="qqName" property="qqName"/>
             <result column="password" property="password"/>
             <result column="userId" property="userId"/>
         </collection>
     </resultMap>
 </mapper>

UserMapper.java

 package com.mybatis.dao;

 import java.util.List;

 import com.mybatis.entry.User;
 import com.mybatis.entry.UserMore;

 public interface UserMapper {

     public User selectById(int id)throws Exception;

     public UserMore selectUserAndYear(String name)throws Exception;

     public List<User> selectUserAndYearMap(String name)throws Exception;

     public List<User> selectUserAndQQMap(String name)throws Exception;

 }

UserService.java

 package com.mybatis.service;

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

 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 com.mybatis.dao.UserMapper;
 import com.mybatis.entry.User;
 import com.mybatis.entry.UserMore;

 public class UserService {

     SqlSessionFactory factory;

     public void before() throws IOException{
         InputStream in = Resources.getResourceAsStream("conf.xml");
         factory = new SqlSessionFactoryBuilder().build(in);
     }

     public User selectById(int id) throws Exception{
         //先获取一个session工厂
         before();
         //生产出一个session
         SqlSession session = factory.openSession();
         //获取user session对象(代理人)
         UserMapper mapper = session.getMapper(UserMapper.class);

         User user = mapper.selectById(id);
         return user;
     }

     public UserMore selectUserAndYear(String name) throws Exception{
         before();
         SqlSession session = factory.openSession();
         UserMapper mapper = session.getMapper(UserMapper.class);
         UserMore more = mapper.selectUserAndYear(name);
         return more;
     }

     public List<User> selectUserAndYearMap(String name) throws Exception{
         before();
         SqlSession session = factory.openSession();
         UserMapper mapper = session.getMapper(UserMapper.class);
         List<User> list = mapper.selectUserAndYearMap(name);
         return list;
     }

     public List<User> selectUserAndQQMap(String name) throws Exception{
         before();
         SqlSession session = factory.openSession();
         UserMapper mapper = session.getMapper(UserMapper.class);
         List<User> list = mapper.selectUserAndQQMap(name);
         return list;
     }
 }

User.java

 package com.mybatis.entry;

 import java.util.List;

 public class User {

     private Integer id;
     private String name;
     private String phoneNum;
     private Phone phone;
     private List<QQ> qqs;

     public User() {
         super();
     }

     public User(String name, String phoneNum) {
         this.name = name;
         this.phoneNum = phoneNum;
     }

     public User(Integer id, String name, String phoneNum) {
         super();
         this.id = id;
         this.name = name;
         this.phoneNum = phoneNum;
     }

     public List<QQ> getQqs() {
         return qqs;
     }

     public void setQqs(List<QQ> qqs) {
         this.qqs = qqs;
     }

     public Phone getPhone() {
         return phone;
     }

     public void setPhone(Phone phone) {
         this.phone = phone;
     }

     public Integer getId() {
         return id;
     }
     public void setId(Integer id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public String getPhoneNum() {
         return phoneNum;
     }
     public void setPhoneNum(String phoneNum) {
         this.phoneNum = phoneNum;
     }

     @Override
     public String toString() {
         return "User [id=" + id + ", name=" + name + ", phoneNum=" + phoneNum + ", phone=" + phone + ", qqs=" + qqs
                 + "]";
     }

 }

QQ.java

 package com.mybatis.entry;

 public class QQ {
     private Integer id;
     private String qqName;
     private String password;
     private Integer userId;

     public QQ() {
         super();
     }
     public Integer getId() {
         return id;
     }
     public void setId(Integer id) {
         this.id = id;
     }
     public String getQqName() {
         return qqName;
     }
     public void setQqName(String qqName) {
         this.qqName = qqName;
     }
     public String getPassword() {
         return password;
     }
     public void setPassword(String password) {
         this.password = password;
     }
     public Integer getUserId() {
         return userId;
     }
     public void setUserId(Integer userId) {
         this.userId = userId;
     }
     @Override
     public String toString() {
         return "QQ [id=" + id + ", qqName=" + qqName + ", password=" + password + ", userId=" + userId + "]";
     }

 }

Phone.java

 package com.mybatis.entry;

 public class Phone {

     private Integer id;
     private String phoneNum;
     private Integer year;

     public Integer getId() {
         return id;
     }
     public void setId(Integer id) {
         this.id = id;
     }
     public String getPhoneNum() {
         return phoneNum;
     }
     public void setPhoneNum(String phoneNum) {
         this.phoneNum = phoneNum;
     }
     public Integer getYear() {
         return year;
     }
     public void setYear(Integer year) {
         this.year = year;
     }

     @Override
     public String toString() {
         return "Phone [id=" + id + ", phoneNum=" + phoneNum + ", year=" + year + "]";
     }

 }

UserMore.java

 package com.mybatis.entry;

 public class UserMore extends User{

     private Integer year;

     public UserMore() {
         super();
     }

     public Integer getYear() {
         return year;
     }

     public void setYear(Integer year) {
         this.year = year;
     }

     @Override
     public String toString() {
         return "UserMore [year=" + year + "]";
     }

 }

Test.java

 package com.mybatis.test;

 import java.util.List;

 import com.mybatis.entry.QQ;
 import com.mybatis.entry.User;
 import com.mybatis.entry.UserMore;
 import com.mybatis.service.UserService;

 public class Test {

     @org.junit.Test
     public void testSelectById() throws Exception{
         UserService service = new UserService();
         User user= service.selectById(1);
         System.out.println(user);
     }

     @org.junit.Test
     public void testUserAndYear() throws Exception{
         UserService service = new UserService();
         UserMore more= service.selectUserAndYear("刘杨");
         System.out.println("id:"+more.getId()+"  name:"+more.getName()+
                 "  phoneNum:"+more.getPhoneNum()+"  year:"+more.getYear());
     }

     @org.junit.Test
     public void testUserAndYearMap() throws Exception{
         UserService service = new UserService();
         List<User> list = service.selectUserAndYearMap("刘杨");
         for(User u:list){
             System.out.println(u.getId()+" "+u.getName()+" "+u.getPhoneNum()+" "+u.getPhone().getYear());
             System.out.println(u);
         }
     }

     @org.junit.Test
     public void testUserAndQQMap() throws Exception{
         UserService service = new UserService();
         List<User> list = service.selectUserAndQQMap("刘杨");
         for(User u:list){
             System.out.print(u.getName()+ "=: ");
             System.out.println(u);
             for(QQ qq:u.getQqs()){
                 System.out.println(qq);
             }
         }
     }

 }