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);
            }
        }
    }
    

    
}