Mybatis 浠ｇ爜瀹炶返

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浣滆€咃細瀵嗗彅

Mybatis 鏄粈涔堬紵

Mybatis 鏄竴涓寔涔呭眰妗嗘灦銆侸ava 涓€氳繃 Mybatis 锛岀▼搴忓彲浠ュ緢鏂逛究鐨勫鏁版嵁搴撹繘琛屾搷浣溿€備娇寮€鍙戣€呬笓娉ㄤ簬 SQL璇彞锛岄伩鍏嶄簡閲嶅鐨?JDBC 浠ｇ爜銆?/p>

  • 浣跨敤 MyBatis 閬垮厤浜嗗嚑涔庢墍鏈夌殑 JDBC 浠ｇ爜鍜屾墜鍔ㄨ缃弬鏁颁互鍙婅幏鍙栫粨鏋滈泦
  • 鐏垫椿涓斿己澶э紝鏀寔瀹氬埗鍖?SQL銆佸瓨鍌ㄨ繃绋嬩互鍙婇珮绾ф槧灏?/li>
  • 鏀寔 XML 鍜屾敞瑙ｄ袱绉嶅舰寮忕紪鍐?SQL
  • 鏁版嵁搴撲腑鐨勮褰曞彲浠ユ槧灏勪负鏅€?Java 瀵硅薄

鍑嗗

鐜锛?/strong>

寮€鍙戝伐鍏凤細IDEA

鍖呯鐞嗭細Maven

JDK锛?.8

Mybatis 锛歁ybatis 3.4.6

闂鍦烘櫙

浣跨敤 Mybatis 瀹屾垚鍩轰簬绠€鍗曟潈闄愯璁＄殑鏁版嵁搴撹〃鐨勭浉鍏虫搷浣溿€佹煡璇?/p>

娑夊強鍒扮殑琛?/p> 

t_user
t_user_info
t_role
t_menu
t_user_role //鍏崇郴琛?t_role_menu //鍏崇郴琛?/code>

瑕佸仛鍝簺鎿嶄綔

  • t_user 琛ㄧ殑绠€鍗曞鍒犳敼鎴?/li>
  • 鍏宠仈澶嶆潅鏌ヨ锛屾煡璇竴涓敤鎴风殑鎵€鏈夋潈闄愪俊鎭?/li>
  • 鍔ㄦ€佹煡璇紝鍖呭惈鏌愪簺鑿滃崟鏉冮檺鐨勭敤鎴?/li>

1銆佹柊寤烘暟鎹簱琛紝鍒濆鍖栦簺鏁版嵁

-- ----------------------------
--  Table structure for `t_menu`
-- ----------------------------
DROP TABLE IF EXISTS `t_menu`;
CREATE TABLE `t_menu` (
  `id` int(10) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) DEFAULT NULL,
  `type` int(11) DEFAULT NULL,
  `url` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8;

-- ----------------------------
--  Table structure for `t_role`
-- ----------------------------
DROP TABLE IF EXISTS `t_role`;
CREATE TABLE `t_role` (
  `id` int(10) NOT NULL AUTO_INCREMENT,
  `name` varchar(100) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

-- ----------------------------
--  Table structure for `t_role_menu`
-- ----------------------------
DROP TABLE IF EXISTS `t_role_menu`;
CREATE TABLE `t_role_menu` (
  `role_id` int(10) DEFAULT NULL,
  `menu_id` int(10) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- ----------------------------
--  Table structure for `t_user`
-- ----------------------------
DROP TABLE IF EXISTS `t_user`;
CREATE TABLE `t_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(50) DEFAULT NULL,
  `password` varchar(50) DEFAULT NULL,
  `nickname` varchar(100) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `t_user_username_uindex` (`username`)
) ENGINE=InnoDB AUTO_INCREMENT=16 DEFAULT CHARSET=utf8;

-- ----------------------------
--  Table structure for `t_user_role`
-- ----------------------------
DROP TABLE IF EXISTS `t_user_role`;
CREATE TABLE `t_user_role` (
  `user_id` int(10) DEFAULT NULL,
  `role_id` int(10) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

SET FOREIGN_KEY_CHECKS = 1;

-- ----------------------------
--  Table structure for `t_user_info`
-- ----------------------------
DROP TABLE IF EXISTS `t_user_info`;
CREATE TABLE `t_user_info` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_id` int(11) DEFAULT NULL,
  `name` varchar(100) COLLATE utf8_bin DEFAULT NULL,
  `email` varchar(100) COLLATE utf8_bin DEFAULT NULL,
  `address` varchar(255) COLLATE utf8_bin DEFAULT NULL,
  `phone` varchar(20) COLLATE utf8_bin DEFAULT NULL,
  `sex` varchar(2) COLLATE utf8_bin DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

SET FOREIGN_KEY_CHECKS = 1;

鎵嬪姩鍒濆鍖栦簺鏁版嵁杩涘幓锛屾瀯寤轰竴浜涘叧鑱旀暟鎹紝涓轰笅闈㈡祴璇曟墍鐢?/p>

2銆佹瀯寤篗aven椤圭洰

鎶€鏈垎浜浘鐗? src=

缁勭粐 project 鐩綍

鈹斺攢鈹€ src
    鈹溾攢鈹€ main
    鈹?? 鈹溾攢鈹€ java
    鈹?? 鈹?? 鈹斺攢鈹€ me
    鈹?? 鈹??     鈹斺攢鈹€ imcoding
    鈹?? 鈹??         鈹溾攢鈹€ dao
    鈹?? 鈹??         鈹溾攢鈹€ mapper
    鈹?? 鈹??         鈹溾攢鈹€ model
    鈹?? 鈹斺攢鈹€ resources
    鈹??     鈹斺攢鈹€ mapper
    鈹斺攢鈹€ test
        鈹斺攢鈹€ java
            鈹斺攢鈹€ me
                鈹斺攢鈹€ imcoding

3銆佸紩鍏?Mybatis 鐩稿叧渚濊禆

鍦?maven 鐜涓紝闇€瑕佸湪 pom.xml 鏂囦欢涓鍔犱緷璧?/p> 

 <dependencies>
    <!--寮曞叆 Mybatis-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.6</version>
    </dependency>
    <!-- 寮曞叆 mysql 椹卞姩-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.46</version>
    </dependency>
     <!-- JSON 宸ュ叿鍖?->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.31</version>
    </dependency>
    <!-- 鍗曞厓娴嬭瘯 -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

4銆侀厤缃?Mybatis

鍦?resources 鐩綍鏂板缓 mybatis-config.xml

鈹斺攢鈹€ resources
    鈹溾攢鈹€ mapper
    鈹斺攢鈹€ mybatis-config.xml

閰嶇疆浠ヤ笅鍐呭

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!--璁剧疆properties 灞炴€ф枃浠?->
    <properties resource="dbconfig.properties"></properties>
    <!--榛樿浣跨敤鐨勯厤缃幆澧冿細development-->
    <environments default="development">
        <!--寮€鍙戠幆澧冮厤缃?->
        <environment id="development">
            <!--浜嬪姟绠＄悊鍣ㄧ殑閰嶇疆-->
            <transactionManager type="JDBC"/>
            <!--閰嶇疆鏁版嵁婧?->
            <dataSource type="POOLED">
                <!--鍔ㄦ€佹浛鎹㈠睘鎬у€?->
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
         <!-- 杩欓噷寮曞叆 Mapper 鏂囦欢-->
    </mappers>

</configuration>

澶栭儴灞炴€ч厤缃紝resources 鐩綍涓嬫柊澧?dbconfig.properties 鏂囦欢

鈹斺攢鈹€ resources
    鈹溾攢鈹€ dbconfig.properties
    鈹溾攢鈹€ mapper
    鈹斺攢鈹€ mybatis-config.xml

閰嶇疆鍐呭锛?/p> 

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/mybatis-demo?useUnicode=true&characterEncoding=utf8
username=root
password=root

鏁版嵁搴撹繛鎺ョ殑鐩稿叧灞炴€т俊鎭?/p>

5銆佽幏鍙? SqlSession

鏍稿績浠ｇ爜锛?/p> 

// 閰嶇疆鏂囦欢浣嶇疆
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession sqlSession = factory.openSession();

鍐欎釜宸ュ叿绫?MybatisUtils锛?/p> 

鈹溾攢鈹€ java
?? 鈹斺攢鈹€ me
?    鈹斺攢鈹€ imcoding
        鈹溾攢鈹€ App.java
?       鈹溾攢鈹€ MybatisUtils.java
public class MybatisUtils {

    private static SqlSessionFactory factory;

    /**
     * 鏍规嵁 mybatis-config.xml 閰嶇疆鍒濆鍖?factory
     */
    private static void initialFactory() {
        String resource = "mybatis-config.xml";
        try {
            InputStream in = Resources.getResourceAsStream(resource);
            factory = new SqlSessionFactoryBuilder().build(in);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static SqlSession getSession() {
        if (factory == null) {
            initialFactory();
        }
        // factory.openSession(true) - 寮€鍚簨鍔¤嚜鍔ㄦ彁浜?        SqlSession sqlSession = factory.openSession();
        return sqlSession;
    }
}

鍩烘湰澧炲垹鏀规煡锛圕URD锛?/h2>

1銆佹瀯寤?Model 绫?/h3>

鐩綍锛?/p> 

 鈹溾攢鈹€ model
?? 鈹溾攢鈹€ Menu.java
 ? 鈹溾攢鈹€ Role.java
   鈹斺攢鈹€ User.java

User

public class User {
    private Integer id;
    private String username;
    private String password;
    private String nickname;

    /*  setter 鍜?getter 鐪佺暐  */
}

Role

public class Role {
    private Integer id;
    private String name;

    // setter 鍜?getter 鏂规硶鐪佺暐...
}

Menu

public class Menu {
    private Integer id;
    private String name;
    private int type;
    private String url;

    // setter and getter ...    
}

UserInfo

public class UserInfo {

    private Integer id;
    private String name;
    private String sex;
    private String address;
    private String phone;
    private String email;

    //setter and getter....
}

2. 鏋勫缓 Mapper 鎺ュ彛

鐩綍锛?/p> 

鈹溾攢鈹€ mapper
?? 鈹斺攢鈹€ UserMapper.java

UserMapper

public interface UserMapper {

    // 鏂板 User
    int insertUser(User user);

    // 鏍规嵁涓婚敭鍒犻櫎
    int deleteUser(int id);

    // 鏇存柊 User
    int updateUser(User user);

    // 鏍规嵁涓婚敭 id 鏌ヨ
    User selectByKey(int id);

    // 鏍规嵁鐢ㄦ埛鍚嶅拰瀵嗙爜鏌ヨ
    User selectByUsernameAndPassword(String username, String password);

}

3銆佸畾涔?Mapper xml

鏂板缓 UserMapper.xml

鈹斺攢鈹€ resources
    鈹溾攢鈹€ dbconfig.properties
    鈹溾攢鈹€ mapper
    鈹?? 鈹斺攢鈹€ UserMapper.xml
    鈹斺攢鈹€ mybatis-config.xml

UserMapper.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">

<!--鏄犲皠 Mapper 鎺ュ彛-->
<mapper namespace="me.imcoding.mapper.UserMapper">

    <!--
        瀵瑰簲 UserMapper 鎺ュ彛涓殑 insertUser()
        id 瑕佸搴旀帴鍙ｄ腑鐨勬柟娉曞悕
        parameterType: 鎸囧畾鍙傛暟绫诲瀷锛屽彲浠ョ渷鐣ワ紝鑷姩閫傞厤
        t_user 琛ㄨ缃富閿?id 鑷姩鏂板
    -->
    <insert id="insertUser" parameterType="me.imcoding.model.User">
      insert into t_user(username, password, nickname)
          values (#{username}, #{password}, #{nickname})
    </insert>

    <!--瀵瑰簲 UserMapper 鎺ュ彛涓殑 deleteUser()-->
    <delete id="deleteUser" >
        delete from t_user where id = #{id}
    </delete>

    <!--
        瀵瑰簲 UserMapper 鎺ュ彛涓殑 updateUser()
        <set> 鍙互鑷姩澶勭悊鍔ㄦ€丼QL璇彞锛岄伩鍏嶆嫾鎺ヨ鍙ユ椂閫犳垚鐨勮娉曢敊璇?    -->
    <update id="updateUser" parameterType="me.imcoding.model.User">
        update t_user
        <set>
            <if test="username != null">username = #{username}</if>
            <if test="password != null">password = #{password}</if>
            <if test="nickname != null">nickname = #{nickname}</if>
        </set>
        where id = #{id}
    </update>

    <!--瀵瑰簲 UserMapper 鎺ュ彛涓殑 selectUser()-->
    <select id="selectUser" resultType="me.imcoding.model.User">
        select
          nickname,
          username,
          password
        from t_user
        where id = #{id}
    </select>

    <!--
        瀵瑰簲 UserMapper 鎺ュ彛涓殑 selectByUsernameAndPassword()
        <where> 鍙互鑷姩澶勭悊鍔ㄦ€丼QL璇彞锛岄伩鍏嶆嫾鎺ヨ鍙ユ椂閫犳垚鐨勮娉曢敊璇?    -->
    <select id="selectByUsernameAndPassword" resultType="me.imcoding.model.User">
        select
          nickname,
          username,
          password
        from t_user
        <where>
            <if test="username != null">
                username = #{username}
            </if>
            <if test="password != null">
                and password = #{password}
            </if>
        </where>
    </select>

</mapper>

涓€瀹氫笉瑕佸繕璁板湪 mybatis-config.xml 涓紩鍏?UserMapper.xml

mybatis-config.xml

<mappers>
    <!-- 杩欓噷寮曞叆 Mapper xml 鏂囦欢-->
    <mapper resource="mapper/UserMapper.xml"></mapper>
</mappers>

4銆佹瀯寤?UserDao

鐩綍锛?/p> 

鈹斺攢鈹€ imcoding
    鈹溾攢鈹€ App.java
    鈹溾攢鈹€ MybatisUtils.java
    鈹溾攢鈹€ dao
       鈹斺攢鈹€ UserDao.java

UserDao

/**
 * Author锛氬瘑鍙?
 */
public class UserDao {

    // 鏂板
    public int insertUser(User user) {
        SqlSession sqlSession = MybatisUtils.getSession();
        int bo;
        try {
            // 浠?sqlSession 涓幏鍙?Mapper 瀹炰緥
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            // 璋冪敤 mapper 鐨勬柟娉?            bo = mapper.insertUser(user);
            sqlSession.commit();//鎻愪氦浜嬪姟
            return bo;
        } finally {
            //涓€瀹氳鍏抽棴 sqlSession
            sqlSession.close();
        }
    }

    // 鍒犻櫎
    public int deleteUser(int id) {
        SqlSession sqlSession = MybatisUtils.getSession();
        int bo;
        try {
            // 浠?sqlSession 涓幏鍙?Mapper 瀹炰緥
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            // 璋冪敤 mapper 鐨勬柟娉?            bo = mapper.deleteUser(id);
            sqlSession.commit();//鎻愪氦浜嬪姟
            return bo;
        } finally {
            //涓€瀹氳鍏抽棴 sqlSession
            sqlSession.close();
        }
    }

    // 鏇存柊
    public int updateUser(User user) {
        SqlSession sqlSession = MybatisUtils.getSession();
        int bo;
        try {
            // 浠?sqlSession 涓幏鍙?Mapper 瀹炰緥
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            // 璋冪敤 mapper 鐨勬柟娉?            bo = mapper.updateUser(user);
            sqlSession.commit();//鎻愪氦浜嬪姟
            return bo;
        } finally {
            //涓€瀹氳鍏抽棴 sqlSession
            sqlSession.close();
        }
    }

   // 鏌ヨ
    public User selectUser(int id) {
        SqlSession sqlSession = MybatisUtils.getSession();
        User user;
        try {
            // 浠?sqlSession 涓幏鍙?Mapper 瀹炰緥
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            // 璋冪敤 mapper 鐨勬柟娉?            user = mapper.selectUser(id);
            sqlSession.commit();//鎻愪氦浜嬪姟
            return user;
        } finally {
            //涓€瀹氳鍏抽棴 sqlSession
            sqlSession.close();
        }
    }

    // 鏍规嵁 username 鍜?password 鏌ヨ
    public User selectByUsernameAndPassword(String username, String password) {
        SqlSession sqlSession = MybatisUtils.getSession();
        User user;
        try {
            // 浠?sqlSession 涓幏鍙?Mapper 瀹炰緥
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            // 璋冪敤 mapper 鐨勬柟娉?            user = mapper.selectByUsernameAndPassword(username, password);
            sqlSession.commit();//鎻愪氦浜嬪姟
            return user;
        } finally {
            //涓€瀹氳鍏抽棴 sqlSession
            sqlSession.close();
        }
    }

}

5銆佹祴璇?/h3>

鐩綍锛?/p> 

鈹斺攢鈹€ test
    鈹斺攢鈹€ java
        鈹斺攢鈹€ me
            鈹斺攢鈹€ imcoding
                鈹斺攢鈹€ AppTest.java

AppTest

/**
 * Author锛氬瘑鍙?
 */
public class UserDao {

    // 鏂板
    public int insertUser(User user) {
        SqlSession sqlSession = MybatisUtils.getSession();
        int bo;
        try {
            // 浠?sqlSession 涓幏鍙?Mapper 瀹炰緥
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            // 璋冪敤 mapper 鐨勬柟娉?            bo = mapper.insertUser(user);
            sqlSession.commit();//鎻愪氦浜嬪姟
            return bo;
        } finally {
            //涓€瀹氳鍏抽棴 sqlSession
            sqlSession.close();
        }
    }

    // 鍒犻櫎
    public int deleteUser(int id) {
        SqlSession sqlSession = MybatisUtils.getSession();
        int bo;
        try {
            // 浠?sqlSession 涓幏鍙?Mapper 瀹炰緥
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            // 璋冪敤 mapper 鐨勬柟娉?            bo = mapper.deleteUser(id);
            sqlSession.commit();//鎻愪氦浜嬪姟
            return bo;
        } finally {
            //涓€瀹氳鍏抽棴 sqlSession
            sqlSession.close();
        }
    }

    // 鏇存柊
    public int updateUser(User user) {
        SqlSession sqlSession = MybatisUtils.getSession();
        int bo;
        try {
            // 浠?sqlSession 涓幏鍙?Mapper 瀹炰緥
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            // 璋冪敤 mapper 鐨勬柟娉?            bo = mapper.updateUser(user);
            sqlSession.commit();//鎻愪氦浜嬪姟
            return bo;
        } finally {
            //涓€瀹氳鍏抽棴 sqlSession
            sqlSession.close();
        }
    }

   // 鏌ヨ
    public User selectUser(int id) {
        SqlSession sqlSession = MybatisUtils.getSession();
        User user;
        try {
            // 浠?sqlSession 涓幏鍙?Mapper 瀹炰緥
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            // 璋冪敤 mapper 鐨勬柟娉?            user = mapper.selectUser(id);
            sqlSession.commit();//鎻愪氦浜嬪姟
            return user;
        } finally {
            //涓€瀹氳鍏抽棴 sqlSession
            sqlSession.close();
        }
    }

    // 鏍规嵁 username 鍜?password 鏌ヨ
    public User selectByUsernameAndPassword(String username, String password) {
        SqlSession sqlSession = MybatisUtils.getSession();
        User user;
        try {
            // 浠?sqlSession 涓幏鍙?Mapper 瀹炰緥
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            // 璋冪敤 mapper 鐨勬柟娉?            user = mapper.selectByUsernameAndPassword(username, password);
            sqlSession.commit();//鎻愪氦浜嬪姟
            return user;
        } finally {
            //涓€瀹氳鍏抽棴 sqlSession
            sqlSession.close();
        }
    }

}

澶嶆潅鏌ヨ

鏌ヨ鏌愪釜 user 鐨勮鎯呬笌鑿滃崟鏉冮檺

SQL锛?/p> 

SELECT
  u.id,
  u.username,
  u.password,
  u.nickname,
  ui.name,
  ui.sex,
  ui.email,
  ui.address,
  ui.phone,
  r.id as role_id,
  r.name as role_name,
  m.id as menu_id,
  m.name as menu_name
FROM
  t_user u
  LEFT outer JOIN t_user_role ur ON u.id = ur.user_id
  LEFT outer JOIN t_role r ON r.id = ur.role_id
  left OUTER JOIN t_role_menu rm ON rm.role_id = r.id
  left outer join t_menu m on m.id = rm.menu_id
  left outer join t_user_info ui on u.id = ui.user_id
WHERE u.username = 鈥?a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="b9dfd8d7dedff9888f8a97dad6d4">[email protected]鈥?/code>

1銆佹柊澧炴帴鍙ｆ柟娉?/h3>

UserMapper.java

public interface UserMapper {

    //....

    // 鏌ヨ user 璇︾粏淇℃伅锛屼互map鏂瑰紡杩斿洖缁撴灉
    User selectUserInfo(int id);

    //....

}

2銆乁serMapper.xml 鏂板鏌ヨ

UserMapper.xml

<mapper>

    .....
<select id="selectUserInfo" resultMap="UserResultMap">
        SELECT
          u.id,
          u.username,
          u.password,
          u.nickname,
          ui.id as ui_id,
          ui.name as ui_name,
          ui.sex as ui_sex,
          ui.email as ui_email,
          ui.address as ui_address,
          ui.phone as ui_phone,
          r.id as role_id,
          r.name as role_name,
          m.id as menu_id,
          m.name as menu_name
        FROM
          t_user u
          LEFT outer JOIN t_user_role ur ON u.id = ur.user_id
          LEFT outer JOIN t_role r ON r.id = ur.role_id
          left OUTER JOIN t_role_menu rm ON rm.role_id = r.id
          left outer join t_menu m on m.id = rm.menu_id
          left outer join t_user_info ui on u.id = ui.user_id
        WHERE u.id = #{id}
    </select>

    <!--瀹氫箟杩斿洖缁撴灉鐨勬槧灏勫叧绯?->
    <resultMap id="UserResultMap" type="me.imcoding.model.User">
        <!--瀵瑰簲 User id 鍙傛暟鏋勯€?->
        <constructor>
            <idArg column="id" javaType="int" ></idArg>
        </constructor>
        <!--User 灞炴€?->
        <result column="username" property="username"></result>
        <result column="password" property="password"></result>
        <result column="nickname" property="nickname"></result>
        <!--瀵瑰簲User 涓?userInfo 瀵硅薄灞炴€?->
        <association property="userInfo" javaType="me.imcoding.model.UserInfo" >
            <!--id 寰堥噸瑕佷笉瑕佺渷鐣?->
            <id column="ui_id" property="id"></id>
            <result column="ui_name" property="name"></result>
            <result column="ui_sex" property="sex"></result>
            <result column="ui_email" property="email"></result>
            <result column="ui_address" property="address"></result>
            <result column="ui_phone" property="phone"></result>
        </association>

        <!--瀵瑰簲 User 鐨?roles 闆嗗悎灞炴€?->
        <collection property="roles" ofType="me.imcoding.model.Role">
            <id column="role_id" property="id"></id>
            <result column="role_name" property="name"></result>
        </collection>
        <!--瀵瑰簲 User 鐨?menus 闆嗗悎灞炴€?->
        <collection property="menus" ofType="me.imcoding.model.Menu">
            <id column="menu_id" property="id"></id>
            <result column="menu_name" property="name"></result>
        </collection>

    </resultMap>

    ....

</mapper>

3銆乁ser 绫绘柊澧炲睘鎬у拰鏋勯€?/h3>

User

public class User {

    // ....

    // 鏃犲弬鏋勯€?    public User() {}
    // id 鍙傛暟鏋勯€?@Param("id") 涓巑apper xml 涓殑 name灞炴€т竴鑷?    public User(Integer id) {
        this.id = id;
    }

    private UserInfo userInfo;
    private List<Role> roles;
    private List<Menu> menus;

    // ....

}

4銆乁serDao 鏂板鏌ヨ

UserDao

public class UserDao {

    //....
    // 鏌ヨ鐢ㄦ埛鐨勬墍鏈夎缁嗕俊鎭?    public User selectUserInfo(int id) {
        SqlSession sqlSession = MybatisUtils.getSession();
        User user;
        try {
            // 浠?sqlSession 涓幏鍙?Mapper 瀹炰緥
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            // 璋冪敤 mapper 鐨勬柟娉?            user = mapper.selectUserInfo(id);
            return user;
        } finally {
            //涓€瀹氳鍏抽棴 sqlSession
            sqlSession.close();
        }
    }

    //    ....

}

5銆佹祴璇?/h3>

AppTest

public class AppTest {

    //......

     @Test
    public void selectUserInfo() {
        UserDao dao = new UserDao();
        User user = dao.selectUserInfo(1);
        System.out.println(JSON.toJSONString(user,true));
    }

    //......
}

缁撴灉锛?/p> 

{
    "id":1,
    "menus":[
        {
            "id":1,
            "name":"绔欑偣淇℃伅",
            "type":0
        },
        {
            "id":2,
            "name":"杞﹁締鏌ヨ",
            "type":0
        },
        {
            "id":3,
            "name":"浜哄憳绠＄悊",
            "type":0
        },
        {
            "id":4,
            "name":"鐢ㄦ埛绠＄悊",
            "type":0
        },
        {
            "id":5,
            "name":"瑙掕壊绠＄悊",
            "type":0
        },
        {
            "id":6,
            "name":"鑿滃崟绠＄悊",
            "type":0
        },
        {
            "id":7,
            "name":"绔欑偣缁存姢",
            "type":0
        }
    ],
    "nickname":"鏂规柟",
    "password":"111111",
    "roles":[
        {
            "id":1,
            "name":"绠＄悊鍛?
        }
    ],
    "userInfo":{
        "address":"涓婃捣闂佃鍖?8",
        "email":"[email protected]",
        "id":1,
        "name":"鏂硅揪",
        "phone":"18276546543",
        "sex":"鐢?
    },
    "username":"[email protected]"
}

婧愮爜

mybatis-practice

Mybatis 鐭ヨ瘑杈圭晫

  • Mybatis 寮曞叆
  • Mybatis 鐨勫繀瑕侀厤缃?/li>
  • Mybatis Mapper XML 锛堟槧灏勬枃浠讹級
  • Mybatis 鍔ㄦ€?SQL
  • Mybatis SqlSession
  • Mybatis 浠ｇ爜鐢熸垚
  • Mybatis 缂撳瓨
  • Mybatis 浜嬪姟

瀛︿範璧勬簮锛?a href="http://www.mybatis.org/mybatis-3/zh/index.html" rel="nofollow">http://www.mybatis.org/mybatis-3/zh/index.html

Mybatis 鏍稿績鐭ヨ瘑

  • Mapper XML 鏄犲皠鏂囦欢鐨勪娇鐢ㄨ鍒?/p>

    瀛︿範锛?a href="http://www.mybatis.org/mybatis-3/zh/sqlmap-xml.html" rel="nofollow">http://www.mybatis.org/mybatis-3/zh/sqlmap-xml.html

  • 鍔ㄦ€?SQL 鐨勫鐞嗚鍒?/p>

    瀛︿範锛?a href="http://www.mybatis.org/mybatis-3/zh/dynamic-sql.html" rel="nofollow">http://www.mybatis.org/mybatis-3/zh/dynamic-sql.html

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