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);

 }