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 roleEntityList;
  private List 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 {
  
  List selectAllUserRoleAuthority();
}




  
    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

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 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 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;
  
  @RequestMapping(value = "index")
  public String index() {
    return "index";
  }

  
  @RequestMapping(value = "selectAll",method = RequestMethod.POST)
  @ResponseBody
  public String selectAll(){
    List 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




  
  首页
  



  
    
    
      用户编号
      用户姓名
      用户性别
      用户生日
      用户地址
      角色名称
      角色描述
      权限名称
      权限描述

运行 localhost:8080 显示：

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MyBatis 三表外关联查询的实现(用户、角色、权限)

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