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 {
/**
* 查询所有关联的数据
*
* @return
*/
List selectAllUserRoleAuthority();
}
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 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 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 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
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
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
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
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：
到此这篇关于MyBatis 三表外关联查询的实现(用户、角色、权限)的文章就介绍到这了,更多相关MyBatis 外关联查询内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！