演示ResultMap的使用

fankay · fankay · commit 0b0ef7567def · 2017-07-04T15:41:45.000+08:00
diff --git a/mybatis/src/main/java/com/kaishengit/entity/Dept.java b/mybatis/src/main/java/com/kaishengit/entity/Dept.java
@@ -0,0 +1,32 @@
+package com.kaishengit.entity;
+
+import java.util.List;
+
+public class Dept {
+
+	private Integer id;
+	private String deptName;
+	private List<User> userList;
+	
+	
+	public Integer getId() {
+		return id;
+	}
+	public void setId(Integer id) {
+		this.id = id;
+	}
+	public String getDeptName() {
+		return deptName;
+	}
+	public void setDeptName(String deptName) {
+		this.deptName = deptName;
+	}
+	public List<User> getUserList() {
+		return userList;
+	}
+	public void setUserList(List<User> userList) {
+		this.userList = userList;
+	}
+	
+	
+}
diff --git a/mybatis/src/main/java/com/kaishengit/entity/User.java b/mybatis/src/main/java/com/kaishengit/entity/User.java
@@ -6,6 +6,9 @@ public class User {
 	private String userName;
 	private String address;
 	private String password;
+	private Integer deptId;
+	private Dept dept;
+	
 	
 	public Integer getId() {
 		return id;
@@ -31,6 +34,19 @@ public String getPassword() {
 	public void setPassword(String password) {
 		this.password = password;
 	}
+	
+	public Integer getDeptId() {
+		return deptId;
+	}
+	public void setDeptId(Integer deptId) {
+		this.deptId = deptId;
+	}
+	public Dept getDept() {
+		return dept;
+	}
+	public void setDept(Dept dept) {
+		this.dept = dept;
+	}
 	@Override
 	public String toString() {
 		return "User [id=" + id + ", userName=" + userName + ", address=" + address + ", password=" + password + "]";
diff --git a/mybatis/src/main/java/com/kaishengit/mapper/DeptMapper.java b/mybatis/src/main/java/com/kaishengit/mapper/DeptMapper.java
@@ -0,0 +1,9 @@
+package com.kaishengit.mapper;
+
+import com.kaishengit.entity.Dept;
+
+public interface DeptMapper {
+
+	Dept findByIdLoadUser(Integer id);
+	
+}
diff --git a/mybatis/src/main/java/com/kaishengit/mapper/UserMapper.java b/mybatis/src/main/java/com/kaishengit/mapper/UserMapper.java
@@ -11,4 +11,7 @@ public interface UserMapper {
 	void save(User user);
 	void update(User user);
 	void delById(Integer id);
+	
+	List<User> findAllLoadDept();
+	
 }
diff --git a/mybatis/src/main/resources/mapper/DeptMapper.xml b/mybatis/src/main/resources/mapper/DeptMapper.xml
@@ -0,0 +1,35 @@
+<?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.kaishengit.mapper.DeptMapper">
+	
+	<select id="findByIdLoadUser" parameterType="int" resultMap="deptMap">
+		SELECT
+			t_dept.id,
+			dept_name,
+			t_user.id AS userid,
+			user_name,
+			address,
+			`password`,
+			dept_id
+		FROM
+			t_dept
+		LEFT JOIN t_user ON t_dept.id = t_user.dept_id
+		WHERE
+			t_dept.id = #{id}
+	</select>
+	
+	<resultMap type="Dept" id="deptMap">
+		<id column="id" property="id"/>
+		<result column="dept_name" property="deptName"/>
+		<collection property="userList" ofType="User">
+			<id column="userid" property="id"/>
+			<result column="user_name" property="userName"/>
+			<result column="address" property="address"/>
+			<result column="password" property="password"/>
+			<result column="dept_id" property="deptId"/>
+		</collection>
+	</resultMap>
+
+</mapper>
diff --git a/mybatis/src/main/resources/mapper/UserMapper.xml b/mybatis/src/main/resources/mapper/UserMapper.xml
@@ -19,6 +19,52 @@
 		select * from t_user
 	</select>
 	
+	<!-- ONGL 进行映射 -->
+	<select id="findAllLoadDept" resultType="User">
+		SELECT
+			t_user.id,
+			user_name,
+			address,
+			PASSWORD,
+			dept_id,
+			t_dept.id AS `dept.id`,
+			t_dept.dept_name AS `dept.deptName`
+		FROM
+			t_user,
+			t_dept
+		WHERE
+			t_user.dept_id = t_dept.id
+	</select>
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	
+	<!-- <select id="findAllLoadDept" resultMap="userMap">
+		select t_user.id,user_name,address,password,dept_id,dept_name from t_user,t_dept
+		where t_user.dept_id = t_dept.id
+	</select> -->
+	
+	<!-- 自定义结果集映射：告诉MyBaits如何将列和类的属性进行对应 -->
+	<!-- <resultMap type="User" id="userMap">
+		<id column="id" property="id"/>
+		<result column="user_name" property="userName"/>
+		<result column="address" property="address"/>
+		<result column="password" property="password"/>
+		<result column="dept_id" property="deptId"/>
+		<association property="dept" javaType="Dept">
+			<id column="dept_id" property="id"/>
+			<result column="dept_name" property="deptName"/>
+		</association>
+	</resultMap> -->
+	
+	
+	
 	<insert id="save" parameterType="User">
 		insert into t_user(user_name,password,address) values(#{userName},#{password},#{address})
 	</insert>
diff --git a/mybatis/src/main/resources/mybatis.xml b/mybatis/src/main/resources/mybatis.xml
@@ -12,6 +12,7 @@
 	<!-- 注册别名 -->
 	<typeAliases>
 		<typeAlias type="com.kaishengit.entity.User" alias="User"/>
+		<typeAlias type="com.kaishengit.entity.Dept" alias="Dept"/>
 	</typeAliases>
 
 	<environments default="dev">
@@ -31,6 +32,7 @@
 	<!-- 加载Mapper配置文件 -->
 	<mappers>
 		<mapper resource="mapper/UserMapper.xml"/>
+		<mapper resource="mapper/DeptMapper.xml"/>
 	</mappers>
 	
 </configuration>
diff --git a/mybatis/src/test/java/com/kaishengit/mybatis/DeptMapperTest.java b/mybatis/src/test/java/com/kaishengit/mybatis/DeptMapperTest.java
@@ -0,0 +1,35 @@
+package com.kaishengit.mybatis;
+
+import java.util.List;
+
+import org.apache.ibatis.session.SqlSession;
+import org.junit.Test;
+
+import com.kaishengit.entity.Dept;
+import com.kaishengit.entity.User;
+import com.kaishengit.mapper.DeptMapper;
+import com.kaishengit.util.MyBatisUtil;
+
+public class DeptMapperTest {
+
+	@Test
+	public void findByIdLoadUser() {
+		
+		SqlSession sqlSession = MyBatisUtil.getSqlSession();
+		DeptMapper deptMapper = sqlSession.getMapper(DeptMapper.class);
+		
+		Dept dept = deptMapper.findByIdLoadUser(1);
+		System.out.println(dept.getDeptName());
+		
+		List<User> userList = dept.getUserList();
+		for(User user : userList) {
+			System.out.println(user.getUserName());
+		}
+		
+		
+		sqlSession.close();
+		
+		
+	}
+	
+}
diff --git a/mybatis/src/test/java/com/kaishengit/mybatis/UserMapperTest.java b/mybatis/src/test/java/com/kaishengit/mybatis/UserMapperTest.java
@@ -5,7 +5,11 @@
 import com.kaishengit.mapper.UserMapper;
 import com.kaishengit.util.MyBatisUtil;
 
+import java.util.List;
+
 import org.apache.ibatis.session.SqlSession;
+import org.junit.After;
+import org.junit.Before;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -14,6 +18,20 @@ public class UserMapperTest {
 
 	private Logger logger = LoggerFactory.getLogger(UserMapperTest.class);
 	
+	private SqlSession sqlSession;
+	private UserMapper userMapper;
+	
+	@Before
+	public void before() {
+		sqlSession = MyBatisUtil.getSqlSession();
+		userMapper = sqlSession.getMapper(UserMapper.class);
+	} 
+	
+	@After
+	public void after() {
+		sqlSession.close();
+	}
+	
 	@Test
 	public void findById() {
 		SqlSession sqlSession = MyBatisUtil.getSqlSession();
@@ -51,6 +69,17 @@ public void save() {
 	}
 	
 	
+	@Test
+	public void findAllLoadDept() {
+		
+		List<User> userList = userMapper.findAllLoadDept();
+		
+		for(User user : userList) {
+			logger.debug("{} -> {}",user.getUserName(),user.getDept().getDeptName());
+		}
+		
+	}
+	
 	
 	
 	

Original file line number	Diff line number	Diff line change
`@@ -11,4 +11,7 @@ public interface UserMapper {`
`11`	`11`	`void save(User user);`
`12`	`12`	`void update(User user);`
`13`	`13`	`void delById(Integer id);`
	`14`	`+`
	`15`	`+ List<User> findAllLoadDept();`
	`16`	`+`
`14`	`17`	`}`