mybatis change 6

mybatis_train/src/main/java/com/mapper/AccountMapper.java

@@ -1,5 +1,6 @@
 package com.mapper;
 
+import com.pojo.dto.AccountVO;
 import com.pojo.entity.AccountEntity;
 import com.pojo.entity.AccountRealEntity;
 import org.apache.ibatis.annotations.Mapper;
@@ -13,4 +14,8 @@ public interface AccountMapper {
     void updateOne(AccountEntity accountEntity);
     void insertOne(AccountEntity accountEntity);
     AccountRealEntity findByResultMap();
+    // 多对一查询
+    AccountVO findVO(Integer id);
+
+
 }

mybatis_train/src/main/java/com/mapper/DepartmentMapper.java

@@ -0,0 +1,10 @@
+package com.mapper;
+
+import com.pojo.dto.DepartmentVO;
+
+public interface DepartmentMapper {
+
+    // 一对多查询
+    DepartmentVO oneFindMore(Integer id);
+
+}

mybatis_train/src/main/java/com/pojo/dto/AccountVO.java

@@ -0,0 +1,17 @@
+package com.pojo.dto;
+
+import com.pojo.entity.AccountEntity;
+import com.pojo.entity.DepartmentEntity;
+import lombok.Data;
+
+@Data
+public class AccountVO  {
+    private Integer id;
+    private String userName;
+    private Double balance;
+    // 部门Id
+    private Integer depId;
+    // 部门信息
+    private DepartmentEntity departmentEntity;
+
+}

mybatis_train/src/main/java/com/pojo/dto/DepartmentVO.java

@@ -0,0 +1,13 @@
+package com.pojo.dto;
+
+import com.pojo.entity.AccountEntity;
+import com.pojo.entity.DepartmentEntity;
+import lombok.Data;
+
+import java.util.List;
+
+@Data
+public class DepartmentVO extends DepartmentEntity {
+    private List<AccountEntity> accountEntities;
+
+}

mybatis_train/src/main/java/com/pojo/entity/AccountRealEntity.java

@@ -7,4 +7,6 @@ public class AccountRealEntity {
     private Integer id;
     private String userName;
     private Double balance;
+    // 部门Id
+    private Integer depId;
 }

mybatis_train/src/main/java/com/pojo/entity/DepartmentEntity.java

@@ -0,0 +1,9 @@
+package com.pojo.entity;
+
+import lombok.Data;
+
+@Data
+public class DepartmentEntity {
+    public Integer depId;
+    public String depName;
+}

mybatis_train/src/main/resources/com/mapper/AccountMapper.xml

@@ -7,6 +7,18 @@
         <result property="userName" column="user_name"></result>
         <result property="balance" column="balance"></result>
     </resultMap>
+    <resultMap id="voMap" type="com.pojo.dto.AccountVO">
+        <id property="id" column="id"></id>
+        <result property="balance" column="balance"></result>
+        <result property="depId" column="dep_id"></result>
+        <result property="userName" column="user_name"></result>
+<!--        association专门用来处理多对一关系映射-->
+        <association property="departmentEntity" javaType="com.pojo.entity.DepartmentEntity">
+            <id property="depId" column="dep_id"></id>
+            <result property="depName" column="dep_name"></result>
+        </association>
+    </resultMap>
+
     <select id="findAll" resultType="account"
             parameterType="java.lang.Integer"
     >
@@ -21,4 +33,9 @@
     <select id="findByResultMap" resultType="com.pojo.entity.AccountRealEntity">
         select * from account where id = 3
     </select>
+    <select id="findVO" resultMap="voMap" parameterType="java.lang.Integer">
+        select a.*,b.dep_name from account a left join department b on a.dep_id = b.dep_id
+        where a.id = #{id}
+    </select>
+
 </mapper>

mybatis_train/src/main/resources/com/mapper/DepartmentMapper.xml

@@ -0,0 +1,22 @@
+<?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.mapper.DepartmentMapper">
+    <resultMap id="oneMore" type="com.pojo.dto.DepartmentVO">
+        <id property="depId" column="dep_id"></id>
+        <result property="depName" column="dep_name"></result>
+        <collection property="accountEntities" ofType="com.pojo.entity.AccountRealEntity">
+            <id property="id" column="id"></id>
+            <result property="userName" column="user_name"></result>
+            <result property="balance" column="balance"></result>
+            <result property="depId" column="dep_id"></result>
+        </collection>
+
+    </resultMap>
+    <select id="oneFindMore" parameterType="java.lang.Integer" resultMap="oneMore">
+        select a.*,b.* from department a left join account b on a.dep_id = b.dep_id
+        where a.dep_id = #{id1}
+    </select>
+
+</mapper>

mybatis_train/src/main/resources/mybatisConfig.xml

@@ -34,6 +34,7 @@
 <!--        使用class方式引入-->
         <mapper class="com.mapper.AccountMapper"></mapper>
         <mapper class="com.mapper.UserMapper"></mapper>
+        <mapper class="com.mapper.DepartmentMapper"></mapper>
 <!--        <package name="com.mapper"/>-->
     </mappers>
 

mybatis_train/src/test/java/Test3.java

@@ -1,4 +1,6 @@
+import com.mapper.AccountMapper;
 import com.mapper.UserMapper;
+import com.pojo.dto.AccountVO;
 import com.pojo.entity.UserEntity;
 import org.apache.ibatis.io.Resources;
 import org.apache.ibatis.session.SqlSession;
@@ -20,6 +22,7 @@ import java.util.List;
 public class Test3 {
     UserMapper userMapper;
     UserMapper userMapper2;
+    AccountMapper accountMapper;
     SqlSession sqlSession;
     SqlSession sqlSession2;
     @Before
@@ -71,6 +74,8 @@ public class Test3 {
         List<UserEntity> userForEach1 = mapper1.findUserForEach(integers);
         sqlSession.close();
         List<UserEntity> userForEach2 = mapper2.findUserForEach(integers);
+        accountMapper = sqlSession2.getMapper(AccountMapper.class);
+        AccountVO vo = accountMapper.findVO(16);
 
     }
 

mybatis_train/src/test/java/TestResultMap.java

@@ -0,0 +1,37 @@
+import com.mapper.AccountMapper;
+import com.mapper.DepartmentMapper;
+import com.mapper.UserMapper;
+import com.pojo.dto.AccountVO;
+import com.pojo.dto.DepartmentVO;
+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.Before;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public class TestResultMap {
+    SqlSession sqlSession;
+    AccountMapper accountMapper;
+    DepartmentMapper departmentMapper;
+    @Before
+    public void before() throws IOException {
+        InputStream resourceAsStream = Resources.getResourceAsStream("mybatisConfig.xml");
+        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(resourceAsStream);
+        sqlSession = build.openSession(true);
+        accountMapper = sqlSession.getMapper(AccountMapper.class);
+        departmentMapper = sqlSession.getMapper(DepartmentMapper.class);
+    }
+
+    @Test
+    public void resultMap1() {
+        AccountVO vo = accountMapper.findVO(16);
+    }
+    @Test
+    public void findOneMore() {
+        DepartmentVO departmentVO = departmentMapper.oneFindMore(1);
+    }
+}