Mybatis_03_一对一

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.cmdzz</groupId>
    <artifactId>mybatis_day03_oneToMany</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>


    <dependencies>
        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>

        <!--mysql连接-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>

        <!--log4j-->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.12</version>
        </dependency>

        <!--junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.10</version>
        </dependency>


    </dependencies>

</project>

<?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">

<!-- mybatis的主配置文件 -->
<configuration>

    <!--引入配置文件-->
    <properties resource="jdbcConfig.properties"></properties>

    <!--配置别名 映射文件里可以直接用domain里的类名 不区分大小写-->
    <typeAliases>
        <package name="com.cmdzz.domain"></package>
    </typeAliases>

    <!--配置环境
        default="mysql" 随便写 当时下面的 environment id 要一致
    -->
    <environments default="mysql">
        <!--配置mysql的环境-->
        <environment id="mysql">
            <!--配置事务类型-->
            <transactionManager type="JDBC"></transactionManager>
            <!--配置数据源（连接池）-->
            <dataSource type="POOLED">
                <!-- 配置连接数据库的4个基本信息 -->
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>

    <!-- 指定映射配置文件的位置，映射配置文件指的是每个dao独立的配置文件 -->
  <!--  <mappers>
        <mapper resource="com/cmdzz/dao/IUserDao.xml"/>
    </mappers>
-->

    <!--直接扫描包-->
    <mappers>
        <package name="com.cmdzz.dao"></package>
    </mappers>
    <!-- 指定映射配置文件的位置，映射配置文件指的是每个dao独立的配置文件
       如果是用注解来配置的话，此处应该使用class属性指定被注解的dao全限定类名
   -->
  <!--  <mappers>
        <mapper class="com.cmdzz.dao.IUserDao"/>
    </mappers>-->
</configuration>

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis57plage
jdbc.username=root
jdbc.password=123456

<?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">

<mapper namespace="com.cmdzz.dao.IAccountDao">

    <!--定义封装account和user的resultMap-->
    <resultMap id="accountUserMap" type="account">
        <id property="id" column="aid"></id>
        <result property="uid" column="uid"></result>
        <result property="money" column="money"></result>
        <!--一对一的关系映射 column是数据库字段名-->
        <association property="user" column="uid" javaType="user">
            <id property="id" column="id"></id>
            <result column="username" property="userName"></result>
            <result column="address" property="address"></result>
            <result column="sex" property="sex"></result>
            <result column="birthday" property="birthday"></result>

        </association>
    </resultMap>


    <!--配置查询所有
      id="findAll" 是UserDao方法名 要一致
  -->
<!--

    <select id="findAll" resultType="account">
        select * from account
    </select>
-->


    <select id="findAll" resultMap="accountUserMap">
       SELECT u.*,a.id AS aid,a.uid,a.money FROM account a,USER u WHERE u.`id`=a.`UID`
    </select>


</mapper>

package com.cmdzz.dao;

import com.cmdzz.domain.Account;

import java.util.List;

/**
 * @author cmdzz
 * @date 2019/7/1 - 16:17
 */
public interface IAccountDao {

    /**
     * 查询所有账户
     * @return
     */
    List<Account> findAll();
}

package com.cmdzz.domain;

import java.io.Serializable;
import java.util.Date;

/**
 * @author cmdzz
 * @date 2019/6/26 - 12:01
 */
public class User implements Serializable {

    /**
     * 属性要和表的列名一样
     */
    private Integer id;
    private String userName;
    private Date birthday;
    private String sex;
    private String address;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", userName=‘" + userName + ‘\‘‘ +
                ", birthday=" + birthday +
                ", sex=‘" + sex + ‘\‘‘ +
                ", address=‘" + address + ‘\‘‘ +
                ‘}‘;
    }
}

package com.cmdzz.domain;


import java.io.Serializable;

/**
 * @author cmdzz
 * @date 2019/7/1 - 16:15
 */
public class Account implements Serializable {
    private Integer id;
    private  Integer uid;
    private Double money;

    private User user;

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Integer getUid() {
        return uid;
    }

    public void setUid(Integer uid) {
        this.uid = uid;
    }

    public Double getMoney() {
        return money;
    }

    public void setMoney(Double money) {
        this.money = money;
    }

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", uid=" + uid +
                ", money=" + money +
                ‘}‘;
    }
}

package com.cmdzz.test;

import com.cmdzz.dao.IAccountDao;
import com.cmdzz.dao.IUserDao;
import com.cmdzz.domain.Account;
import com.cmdzz.domain.User;
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 org.junit.After;
import org.junit.Before;
import org.junit.Test;

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

/**
 * @author cmdzz
 * @date 2019/6/26 - 17:21
 */
public class AccountTest {


    private InputStream in;
    private SqlSession sqlSession;
    private IAccountDao accountDao;

    @Before//用于在测试方法执行之前执行
    public void init()throws Exception{
        //1.读取配置文件，生成字节输入流
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.获取SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        //3.获取SqlSession对象
        sqlSession = factory.openSession();
        //4.获取dao的代理对象
        accountDao = sqlSession.getMapper(IAccountDao.class);
    }

    @After//用于在测试方法执行之后执行
    public void destroy()throws Exception{
        //提交事务
        sqlSession.commit();
        //6.释放资源
        sqlSession.close();
        in.close();
    }

    /**
    * 测试查询所有
    */
    @Test
    public void testFindAll() {

        //5.执行查询所有方法
        List<Account> accounts = accountDao.findAll();
        for(Account account:accounts){
            System.out.println("用户信息====================");
            System.out.println(account);
            System.out.println(account.getUser());
        }

    }




}