MyBatis 三表外关联查询的实现(用户、角色、权限)

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

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;
}

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 <span style="color:transparent">来1源gaodai#ma#com搞*代#码1网</span>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>