mybatis之关联(2)

MapperAssoDao.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">

<mapper namespace="association.AssoDao">

    <!--关联：使用对象关联方法-->
    <select id="selectByAsso2" parameterType="String" resultMap="selectByAsso2">
        SELECT u.id uid,u.name uname,u.age uage,s.name sname,s.salary ssalary FROM user u, salary s
                WHERE u.name = s.name AND u.name = #{name}
    </select>
    <resultMap type="association.AssoObj" id="selectByAsso2">
        <result property="id" column="uid"/>
        <result property="name" column="uname"/>
        <result property="age" column="uage"/>
        <result property="salary.name" column="sname"/>
        <result property="salary.salary" column="ssalary"/>
    </resultMap>

    <!--关联：使用association关联方法-->
    <select id="selectByAsso3" parameterType="String" resultMap="selectByAsso3">
        SELECT u.id uid,u.name uname,u.age uage,s.name sname,s.salary ssalary FROM user u, salary s
        WHERE u.name = s.name AND u.name = #{name}
    </select>
    <resultMap type="association.AssoObj" id="selectByAsso3">
        <result property="id" column="uid"/>
        <result property="name" column="uname"/>
        <result property="age" column="uage"/>
        <association property="salary" javaType="bean.Salary">
            <id property="name" column="sname"></id>
            <id property="salary" column="ssalary"></id>
        </association>
    </resultMap>

</mapper>

TestAsso.java

package association;

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

/*
* 关联举例
*
* */
public class TestAsso {
    String resource = "mybatis-config-assosciation.xml";
    SqlSessionFactory sqlSessionFactory = null;
    SqlSession session = null;

    //    关联：使用对象关联方法
    @Test
    public void testSelectByAsso2() {
        AssoDao dao = session.getMapper(AssoDao.class);
        List<AssoObj> assoObjs = dao.selectByAsso2("Tom");
        System.out.println("查询到AssoObj：" + assoObjs);
    }

    //    关联：使用association关联方法
    @Test
    public void testSelectByAsso3() {
        AssoDao dao = session.getMapper(AssoDao.class);
        List<AssoObj> assoObjs = dao.selectByAsso3("Tom");
        System.out.println("查询到AssoObj：" + assoObjs);
    }


    @Before
    public void before() {
//        System.out.println("Before");
        try {
            InputStream inputStream = Resources.getResourceAsStream(resource);
//            创建工厂
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
//            创建session对象
            session = sqlSessionFactory.openSession();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @After
    public void close() {
        session.close();
//        System.out.println("After");
    }

}

AssoDao.java

package association;

import org.apache.ibatis.annotations.Select;

import java.util.List;

public interface AssoDao {
    public List selectByAsso2(String name);

    public List selectByAsso3(String name);

}