mybatis project change6

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

@@ -1,6 +1,7 @@
 package com.mapper;
 
 import com.pojo.entity.AccountEntity;
+import com.pojo.entity.AccountRealEntity;
 import org.apache.ibatis.annotations.Mapper;
 import org.springframework.stereotype.Component;
 import org.springframework.stereotype.Repository;
@@ -11,4 +12,5 @@ public interface AccountMapper {
     List<AccountEntity> findAll(Integer id);
     void updateOne(AccountEntity accountEntity);
     void insertOne(AccountEntity accountEntity);
+    AccountRealEntity findByResultMap();
 }

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

@@ -0,0 +1,10 @@
+package com.pojo.entity;
+
+import lombok.Data;
+
+@Data
+public class AccountRealEntity {
+    private Integer id;
+    private String userName;
+    private Double balance;
+}

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

@@ -2,6 +2,11 @@
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 
 <mapper namespace="com.mapper.AccountMapper">
+    <resultMap id="accountResultMap" type="com.pojo.entity.AccountRealEntity">
+        <id property="id" column="id"></id>
+        <result property="userName" column="user_name"></result>
+        <result property="balance" column="balance"></result>
+    </resultMap>
     <select id="findAll" resultType="account"
             parameterType="java.lang.Integer"
     >
@@ -13,4 +18,7 @@
     <update id="updateOne" parameterType="account">
         update account set user_name= #{user_name},balance=#{balance} where id = #{id}
     </update>
+    <select id="findByResultMap" resultType="com.pojo.entity.AccountRealEntity">
+        select * from account where id = 3
+    </select>
 </mapper>

mybatis_train/src/main/resources/mybatisConfig.xml

@@ -6,6 +6,7 @@
     <properties resource="jdbc.properties"></properties>
     <settings>
         <setting name="logImpl" value="LOG4J2"/>
+        <setting name="mapUnderscoreToCamelCase" value="true"/>
     </settings>
     <!--    Mapper文件注册-->
     <typeAliases>

mybatis_train/src/test/java/Test1.java

@@ -1,5 +1,6 @@
 import com.mapper.AccountMapper;
 import com.pojo.entity.AccountEntity;
+import com.pojo.entity.AccountRealEntity;
 import org.apache.ibatis.io.Resources;
 import org.apache.ibatis.session.SqlSession;
 import org.apache.ibatis.session.SqlSessionFactory;
@@ -43,4 +44,13 @@ public class Test1 {
         AccountMapper mapper = sqlSession.getMapper(AccountMapper.class);
         List<AccountEntity> all = mapper.findAll(9);
     }
+    // 测试resultMap
+    @Test
+    public void testResultMap() throws IOException {
+        InputStream resourceAsStream = Resources.getResourceAsStream("mybatisConfig.xml");
+        SqlSessionFactory sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder().build(resourceAsStream);
+        SqlSession sqlSession = sqlSessionFactoryBuilder.openSession(true);
+        AccountMapper mapper = sqlSession.getMapper(AccountMapper.class);
+        AccountRealEntity byResultMap = mapper.findByResultMap();
+    }
 }

mybatis_train/src/test/java/Test3.java

@@ -71,7 +71,6 @@ public class Test3 {
         List<UserEntity> userForEach1 = mapper1.findUserForEach(integers);
         sqlSession.close();
         List<UserEntity> userForEach2 = mapper2.findUserForEach(integers);
-        sqlSession2.close();
 
     }