MyBatis 三表外关联查询的实现(用户、角色、权限

一、数据库结构

二、查询所有数据记录（SQL语句）

SQL语句：

SELECT u.*, r.*, a.* FROM
(
  (
    ( user u INNER JOIN user_role ur ON ur.user_id = u.user_id )
    INNER JOIN role r ON r.role_id = ur.role_id
  )
  INNER JOIN role_authority ra ON ra.role_id = r.role_id
)
INNER JOIN authority a ON ra.authority_id = a.authority_id

三、详细代码（第一中方式）

1、实体类entity

package cn.lemon.demo.entity;

import lombok.Data;

import java.io.Serializable;

@Data
public class AuthorityEntity implements Serializable {
  private Integer authorityId;
  private String authorityName;
  private String authorityDescription;
}

package cn.lemon.demo.entity;

import lombok.Data;

import java.io.Serializable;

@Data
public class RoleEntity implements Serializable {
  private Integer roleId;
  private String roleName;
  private String roleDescription;
}

package cn.lemon.demo.entity;

import lombok.Data;

import java.io.Serializable;
import java.util.Date;
import java.util.List;

@Data
public class UserEntity implements Serializable {
  private Integer userId;
  private String userName;
  private String userSex;
  private Date userBirthday;
  private String userAddress;

  private List<RoleEntity> roleEntityList;
  private List<AuthorityEntity> authorityEntityList;
}

2、数据访问层dao、Mapper

package cn.lemon.demo.dao;

import cn.lemon.demo.entity.UserEntity;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
public interface IUserDao {
  /**
   * 查询所有关联的数据
   *
   * @return
   */
  List<UserEntity> selectAllUserRoleAuthority();
}

<?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="cn.lemon.demo.dao.IUserDao">
  <select id="selectAllUserRoleAuthority" resultMap="userMap">
    SELECT u.*, r.*, a.* FROM
    (
      (
        ( user u INNER JOIN user_role ur ON ur.user_id = u.user_id )
        INNER JOIN role r ON r.role_id = ur.role_id
      )
      INNER JOIN role_authority ra ON ra.role_id = r.role_id
    )
    INNER JOIN authority a ON ra.authority_id = a.authority_id
  </select>
  
  <resultMap id="userMap" type="cn.lemon.demo.entity.UserEntity">
    <id property="userId" column="user_id"/>
    <result property="userName" column="user_name"/>
    <result property="userSex" column="user_sex"/>
    <result property="userBirthday" column="user_birthday"/>
    <result property="userAddress" column="user_address"/>
    <collection property="roleEntityList" ofType="cn.lemon.demo.entity.RoleEntity" resultMap="roleMap"/>
    <collection property="authorityEntityList" ofType="cn.lemon.demo.entity.AuthorityEntity" resultMap="authorityMap"/>
  </resultMap>
  <resultMap id="roleMap" type="cn.lemon.demo.entity.RoleEntity">
    <id property="roleId" column="role_id"/>
    <result property="roleName" column="role_name"/>
    <result property="roleDescription" column="role_description"/>
  </resultMap>
  <resultMap id="authorityMap" type="cn.lemon.demo.entity.AuthorityEntity">
    <id property="authorityId" column="authority_id"/>
    <result property="authorityName" column="authority_name"/>
    <result property="authorityDescription" column="authority_description"/>
  </resultMap>
</mapper>

3、业务层service

package cn.lemon.demo.service;

import cn.lemon.demo.entity.UserEntity;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public interface IUserService {
  List<UserEntity> selectAllUserRoleAuthority();
}

package cn.lemon.demo.service.impl;

import cn.lemon.demo.dao.IUserDao;
import cn.lemon.demo.entity.UserEntity;
import cn.lemon.demo.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserServiceImpl implements IUserService {
  @Autowired
  private IUserDao userDao;

  @Override
  public List<UserEntity> selectAllUserRoleAuthority() {
    return userDao.selectAllUserRoleAuthority();
  }
}

4、测试类

package cn.lemon.demo.service.impl;

import cn.lemon.demo.entity.UserEntity;
import cn.lemon.demo.service.IUserService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;

@SpringBootTest
@RunWith(SpringRunner.class)
public class UserServiceImplTest {
  @Autowired
  private IUserService userService;

  @Test
  public void selectAllUserRoleAuthority() {
    List<UserEntity> userEntities = userService.selectAllUserRoleAuthority();
    for (UserEntity userEntity : userEntities) {
      System.out.println(
          "用户姓名：" + userEntity.getUserName() +
          "用户地址：" + userEntity.getUserAddress() +
          "权限列表：" + userEntity.getAuthorityEntityList() +
          "角色列表：" + userEntity.getRoleEntityList());
      System.out.println("--------------------------------------");
    }
  }
}

四、详细代码（第二中方式）

1、实体类entity （实体类可以省略不写）

package cn.lemon.demo.entity;

import lombok.Data;

import java.io.Serializable;
import java.util.Date;

@Data
public class UserEntity implements Serializable {
  private Long userId;
  private String userName;
  private String userSex;
  private Date userBirthday;
  private String userAddress;
}

package cn.lemon.demo.entity;

import lombok.Data;

import java.io.Serializable;

@Data
public class RoleEntity implements Serializable {
  private Long roleId;
  private String roleName;
  private String roleDescription;
}

package cn.lemon.demo.entity;

import lombok.Data;

import java.io.Serializable;

@Data
public class AuthorityEntity implements Serializable {
  private Long authorityId;
  private String authorityName;
  private String authorityDescription;
}

2、数据访问层dao、Mapper

package cn.lemon.demo.dao;

import java.util.List;
import java.util.Map;

public interface IUserDao {
  List<Map> selectAllUserRoleAuthority();
}

<?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="cn.lemon.demo.dao.IUserDao">
  <!--查询 用户信息，角色信息，权限信息-->
  <select id="selectAllUserRoleAuthority" resultType="java.util.Map">
    SELECT
    u.user_id userId,
    u.user_name userName,
    u.user_sex userSex,
    u.user_birthday userBirthday,
    u.user_address userAddress,
    r.role_name roleName,
    r.role_description roleDescription,
    a.authority_name authorityName,
    a.authority_description authorityDescription
    FROM
      (
        (
          ( USER u INNER JOIN user_role ur ON u.user_id = ur.user_id )
          INNER JOIN role r ON r.role_id = ur.role_id
        )
        INNER JOIN role_authority ra ON ra.role_id = r.role_id
      )
    INNER JOIN authority a ON a.authority_id = ra.authority_id
  </select>
</mapper>

3、业务层service （接口及实现类）

package cn.lemon.demo.service;

import java.util.List;
import java.util.Map;

public interface IUserService {
  List<Map> selectAllUserRoleAuthority();
}

package cn.lemon.demo.service.impl;

import cn.lemon.demo.dao.IUserDao;
import cn.lemon.demo.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;

@Service
public class UserServiceImpl implements IUserService {
  @Autowired
  private IUserDao userDao;

  @Override
  public List<Map> selectAllUserRoleAuthority() {
    return userDao.selectAllUserRoleAuthority();
  }
}

4、控制层controller

package cn.lemon.demo.controller;

import cn.lemon.demo.service.IUserService;
import com.alibaba.fastjson.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;
import java.util.Map;

@Controller
@RequestMapping(value = "/")
public class SystemController {
  @Autowired
  private IUserService userService;
  /**
   * 跳转页面
   *
   * @return
   */
  @RequestMapping(value = "index")
  public String index() {
    return "index";
  }

  /**
   * 查询所有关联的数据 用户信息，角色信息，权限信息
   * @return
   */
  @RequestMapping(value = "selectAll",method = RequestMethod.POST)
  @ResponseBody
  public String selectAll(){
    List<Map> mapList = userService.selectAllUserRoleAuthority();
    JSONObject json = new JSONObject();
    json.put("mapList",mapList);
    System.out.println(json.toJSONString());
    return json.toJSONString();
  }
}

5、前端页面 index.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
  <meta charset="UTF-8">
  <title>首页</title>
  <script type="text/javascript" th:src="@{/static/js/jquery-1.11.3.min.js}"></script>
</head>
<body>
<div id="head">
  <table width="100%" align="center" border="2px" cellspacing="2px">
    <thead>
    <tr>
      <th>用户编号</th>
      <th>用户姓名</th>
      <th>用户性别</th>
      <th>用户生日</th>
      <th>用户地址</th>
      <th>角色名称</th>
      <th>角色描述</th>
      <th>权限名称</th>
      <th>权限描述</th>
    </tr>
    </thead>
    <tbody id="tbody">

    </tbody>
  </table>
</div>
<script type="text/javascript">
  $(function () {
    $.ajax({
      type: "post",
      url: '/selectAll',
      contentType: "application/json;charset=utf-8",
      dataType: 'json',
      //async: false,/*表示请求为同步方式*/
      success: function (data) {
        //在<tbody>中追加数据
        for (var i = 0; i < data.mapList.length; i++) {
          $("#tbody").append("<tr><td>" + data.mapList[i].userId + "</td>" +
            "<td>" + data.mapList[i].userName + "</td>" +
            "<td>" + data.mapList[i].userSex + "</td>" +
            "<td>" + data.mapList[i].userBirthday + "</td>" +
            "<td>" + data.mapList[i].userAddress + "</td>" +
            "<td>" + data.mapList[i].roleName + "</td>" +
            "<td>" + data.mapList[i].roleDescription + "</td>" +
            "<td>" + data.mapList[i].authorityName + "</td>" +
            "<td>" + data.mapList[i].authorityDescription + "</td>" +
            "</tr>");
        }
      },
      error: function () {
        window.alert("查询失败");
      }
    });
  });
</script>
</body>
</html>

运行 localhost:8080 显示：

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