• Mybatis-Plus用纯注解完成一对多&多对多查询

    Mybatis-Plus用纯注解搞定一对多&多对多查询

    业务中很常见的用户-角色就属于典型的多对多关系. 假设我们需要将用户信息（包括了用户对应的角色信息）查询出来

    多对多

    数据表结构

    user表和role表的关系为多对多，即一个user可以分配多个role，一个role可以属于多个user。

    1.user表

    CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键',
  `nickname` varchar(20) NOT NULL COMMENT '昵称',
  `birthday` date NOT NULL COMMENT '生日',
  `username` varchar(32) NOT NULL COMMENT '用户名',
  `password` varchar(30) NOT NULL COMMENT '密码',
  `status` varchar(2) NOT NULL DEFAULT '0' COMMENT '状态 ',
  `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
  `update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB;

INSERT INTO `user` VALUES (1, 'lh', '2022-06-29', '李大', '123456', '0', '2022-06-29 09:02:07', '2022-06-29 09:02:07');
INSERT INTO `user` VALUES (2, 'ww', '2022-06-29', '陈大', '123456', '0', '2022-06-29 13:06:24', '2022-06-29 13:06:24');
INSERT INTO `user` VALUES (3, 'aa', '2022-06-29', '刘达', '123456', '0', '2022-06-29 13:06:48', '2022-06-29 13:06:48');

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    2.role表

    CREATE TABLE `role` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键id',
  `name` varchar(20) NOT NULL COMMENT '角色名称',
  `remark` varchar(50) DEFAULT NULL COMMENT '角色描述',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB;

INSERT INTO `role` VALUES (1, '系统管理员', '系统管理员');
INSERT INTO `role` VALUES (2, '数据管理员', '数据管理员');

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    3.user_role中间表

    CREATE TABLE `user_role` (
  `user_id` int(11) NOT NULL COMMENT '用户id',
  `role_id` int(11) DEFAULT NULL COMMENT '角色id'
) ENGINE=InnoDB;

INSERT INTO `user_role` VALUES (1, 1);
INSERT INTO `user_role` VALUES (1, 2);
INSERT INTO `user_role` VALUES (2, 1);
INSERT INTO `user_role` VALUES (2, 2);
INSERT INTO `user_role` VALUES (3, 1);

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    实体类:

    1.User类:

    package wjw.test.mybatisplus.vo;

import java.io.Serializable;
import java.time.LocalDate;
import java.time.LocalDateTime;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;

public class User implements Serializable {

  private static final long serialVersionUID = 1L;

  @TableId(
      type = IdType.AUTO)
  /**
   * 主键
   */
  private Integer id;

  /**
   * 昵称
   */
  private String nickname;

  /**
   * 生日
   */
  private LocalDate birthday;

  /**
   * 用户名
   */
  private String username;

  /**
   * 密码
   */
  private String password;

  /**
   * 状态
   */
  private String status;

  /**
   * 创建时间
   */
  private LocalDateTime createTime;

  /**
   * 更新时间
   */
  private LocalDateTime updateTime;

  public User() {
  }

  public Integer getId() {
    return id;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  public String getNickname() {
    return nickname;
  }

  public void setNickname(String nickname) {
    this.nickname = nickname;
  }

  public LocalDate getBirthday() {
    return birthday;
  }

  public void setBirthday(LocalDate birthday) {
    this.birthday = birthday;
  }

  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }

  public String getStatus() {
    return status;
  }

  public void setStatus(String status) {
    this.status = status;
  }

  public LocalDateTime getCreateTime() {
    return createTime;
  }

  public void setCreateTime(LocalDateTime createTime) {
    this.createTime = createTime;
  }

  public LocalDateTime getUpdateTime() {
    return updateTime;
  }

  public void setUpdateTime(LocalDateTime updateTime) {
    this.updateTime = updateTime;
  }

  @Override
  public String toString() {
    StringBuilder builder = new StringBuilder();
    builder.append("User [id=");
    builder.append(id);
    builder.append(", nickname=");
    builder.append(nickname);
    builder.append(", birthday=");
    builder.append(birthday);
    builder.append(", username=");
    builder.append(username);
    builder.append(", password=");
    builder.append(password);
    builder.append(", status=");
    builder.append(status);
    builder.append(", createTime=");
    builder.append(createTime);
    builder.append(", updateTime=");
    builder.append(updateTime);
    builder.append("]");
    return builder.toString();
  }

}

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    2.Role类:

    package wjw.test.mybatisplus.vo;

import java.io.Serializable;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;

public class Role implements Serializable {

  private static final long serialVersionUID = 1L;

  @TableId(
      type = IdType.AUTO)
  /**
   * 主键id
   */
  private Integer id;

  /**
   * 角色名称
   */
  private String name;

  /**
   * 角色描述
   */
  private String remark;

  public Role() {
  }

  public Integer getId() {
    return id;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public String getRemark() {
    return remark;
  }

  public void setRemark(String remark) {
    this.remark = remark;
  }

  @Override
  public String toString() {
    StringBuilder builder = new StringBuilder();
    builder.append("Role [id=");
    builder.append(id);
    builder.append(", name=");
    builder.append(name);
    builder.append(", remark=");
    builder.append(remark);
    builder.append("]");
    return builder.toString();
  }

}

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    3.包含一对多关系的UserVo类:

    package wjw.test.mybatisplus.vo;

import java.time.LocalDate;
import java.util.List;

public class UserVo {
  /**
   * 用户编号
   */
  private Integer id;

  /**
   * 昵称
   */
  private String nick_Name;

  /**
   * 用户名
   */
  private String username;

  /**
   * 生日
   */
  private LocalDate birthday;

  private List<Role> roles;

  public Integer getId() {
    return id;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  public String getNick_Name() {
    return nick_Name;
  }

  public void setNick_Name(String nick_Name) {
    this.nick_Name = nick_Name;
  }

  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public LocalDate getBirthday() {
    return birthday;
  }

  public void setBirthday(LocalDate birthday) {
    this.birthday = birthday;
  }

  public List<Role> getRoles() {
    return roles;
  }

  public void setRoles(List<Role> roles) {
    this.roles = roles;
  }

  public UserVo() {
    super();
  }

  @Override
  public String toString() {
    StringBuilder builder = new StringBuilder();
    builder.append("UserVo [id=");
    builder.append(id);
    builder.append(", nick_Name=");
    builder.append(nick_Name);
    builder.append(", username=");
    builder.append(username);
    builder.append(", birthday=");
    builder.append(birthday);
    builder.append(", roles=");
    builder.append(roles);
    builder.append("]");
    return builder.toString();
  }

}

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    Mapper类:

    1.RoleMapper:

    package wjw.test.mybatisplus.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;

import wjw.test.mybatisplus.vo.Role;

@Mapper
public interface RoleMapper extends BaseMapper<Role> {
    /**
     * 根据指定的userId去user和user_role关联表查出该user所属role列表
     * @param userId
     * @return
   */
  @Select("select * from role left join user_role on role.id=user_role.role_id where user_role.user_id=#{userId}")
  List<Role> getListByUserId(Integer userId);    
}


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    2.UserMapper:

    package wjw.test.mybatisplus.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Many;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;

import wjw.test.mybatisplus.vo.User;
import wjw.test.mybatisplus.vo.UserVo;

@Mapper
public interface UserMapper extends BaseMapper<User> {
    //OneToMany一对多查询
    @Select("select * from user where ${ew.sqlSegment}")
    @Results({@Result(column = "id",property = "id"),                         // <1>
              @Result(column = "nickname",property = "nick_Name"),
              @Result(column = "id" /* 这里的id是要传递给下面查询里需要的参数 */,   //<2>
                      property = "roles" /* 这里是UserVo类里的roles字段 */,many=@Many(
                      select = "wjw.test.mybatisplus.mapper.RoleMapper.getListByUserId"
              ))
    })
    List<UserVo> getList(@Param("ew") QueryWrapper wrapper);    
}


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    <1>: @Result(column=“id”,property=“Id”),这个可以不写，也不会报错，但是会导致我们查询结果列表里每个UVO 实体的Id等属性没有值。

    <2>: 这个@Result中

    column, 主表中的列名，这个列的值要作为查询参数传给子查询。

    property，代表子查询的查询结果关联的实体属性，就是UserVo中的roles字段。

    select="wjw.test.mybatisplus.mapper.RoleMapper.getListByUserId"代表使用的子查询方法，就是RoleMapper类里的getListByUserId()方法。 意思就是查询主表，并将主表的id这个列和子查询关联起来，将id的值作为查询条件传入子查询中，子查询返回的结果存入到属性roles中.

    测试

    package wjw.test.mybatisplus;

import java.util.List;

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
import org.springframework.test.context.ActiveProfiles;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

import wjw.test.mybatisplus.mapper.RoleMapper;
import wjw.test.mybatisplus.mapper.UserMapper;
import wjw.test.mybatisplus.vo.User;
import wjw.test.mybatisplus.vo.UserVo;

@SpringBootTest(webEnvironment = WebEnvironment.NONE)
public class MybatisPlusTests1 {
  @Autowired
  private UserMapper userMapper;

  public MybatisPlusTests1() {
    //
  }

  @BeforeEach
  public void setup() {
    //
  }

  @AfterEach
  public void stop() {
  }

  @Test
  public void getUserInfo(){
      QueryWrapper<User> wrapper=new QueryWrapper();
      wrapper.in("id",1,2);
      List<UserVo> list = userMapper.getList(wrapper);
      System.out.println(list);
  }
  
}


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    输出结果:

    wjw.test.mybatisplus.MybatisPlusTests1 - [logStarted,61] - Started MybatisPlusTests1 in 2.855 seconds (JVM running for 3.885)
wjw.test.mybatisplus.mapper.UserMapper.getList - [debug,137] - ==>  Preparing: select * from user where (id IN (?,?))
wjw.test.mybatisplus.mapper.UserMapper.getList - [debug,137] - ==> Parameters: 1(Integer), 2(Integer)
wjw.test.mybatisplus.mapper.UserMapper.getList - [trace,143] - <==    Columns: id, nickname, birthday, username, password, status, create_time, update_time
wjw.test.mybatisplus.mapper.UserMapper.getList - [trace,143] - <==        Row: 1, lh, 2022-06-29, 李大, 123456, 0, 2022-06-29 09:02:07.0, 2022-06-29 09:02:07.0
w.t.mybatisplus.mapper.RoleMapper.getListByUserId - [debug,137] - ====>  Preparing: select * from role left join user_role on role.id=user_role.role_id where user_role.user_id=?
w.t.mybatisplus.mapper.RoleMapper.getListByUserId - [debug,137] - ====> Parameters: 1(Integer)
w.t.mybatisplus.mapper.RoleMapper.getListByUserId - [trace,143] - <====    Columns: id, name, remark, user_id, role_id
w.t.mybatisplus.mapper.RoleMapper.getListByUserId - [trace,143] - <====        Row: 1, 系统管理员, 系统管理员, 1, 1
w.t.mybatisplus.mapper.RoleMapper.getListByUserId - [trace,143] - <====        Row: 2, 数据管理员, 数据管理员, 1, 2
w.t.mybatisplus.mapper.RoleMapper.getListByUserId - [debug,137] - <====      Total: 2
wjw.test.mybatisplus.mapper.UserMapper.getList - [trace,143] - <==        Row: 2, ww, 2022-06-29, 陈大, 123456, 0, 2022-06-29 13:06:24.0, 2022-06-29 13:06:24.0
w.t.mybatisplus.mapper.RoleMapper.getListByUserId - [debug,137] - ====>  Preparing: select * from role left join user_role on role.id=user_role.role_id where user_role.user_id=?
w.t.mybatisplus.mapper.RoleMapper.getListByUserId - [debug,137] - ====> Parameters: 2(Integer)
w.t.mybatisplus.mapper.RoleMapper.getListByUserId - [trace,143] - <====    Columns: id, name, remark, user_id, role_id
w.t.mybatisplus.mapper.RoleMapper.getListByUserId - [trace,143] - <====        Row: 1, 系统管理员, 系统管理员, 2, 1
w.t.mybatisplus.mapper.RoleMapper.getListByUserId - [trace,143] - <====        Row: 2, 数据管理员, 数据管理员, 2, 2
w.t.mybatisplus.mapper.RoleMapper.getListByUserId - [debug,137] - <====      Total: 2
wjw.test.mybatisplus.mapper.UserMapper.getList - [debug,137] - <==      Total: 2
[UserVo [id=1, nick_Name=lh, username=李大, birthday=2022-06-29, roles=[Role [id=1, name=系统管理员, remark=系统管理员], Role [id=2, name=数据管理员, remark=数据管理员]]], UserVo [id=2, nick_Name=ww, username=陈大, birthday=2022-06-29, roles=[Role [id=1, name=系统管理员, remark=系统管理员], Role [id=2, name=数据管理员, remark=数据管理员]]]]


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    将user的id=1,id=2传入，得到结果如下：

    [UserVo [id=1, nick_Name=lh, username=李大, birthday=2022-06-29, roles=[Role [id=1, name=系统管理员, remark=系统管理员], Role [id=2, name=数据管理员, remark=数据管理员]]], UserVo [id=2, nick_Name=ww, username=陈大, birthday=2022-06-29, roles=[Role [id=1, name=系统管理员, remark=系统管理员], Role [id=2, name=数据管理员, remark=数据管理员]]]]

    • 1

    可以看出表中id为1和2的user信息和其对应的角色信息都已经查询出来了。

    如果传递多个参数呢?

    如果select属性指定的方法需要多个参数,column的写法是这样的:column = "{查询参数1=主查询列名1, 查询参数2=主查询列名2}"

    @Select({"select * from group where account_id=#{accountId} and delete_flag=0"})
@Results({@Result(property = "groupId", column = "group_id", id = true),
          @Result(property = "name", column = "user_name"), 
          @Result(property = "accountId", column = "account_id"),
          @Result(property = "deleteFlag", column = "delete_Flag"),
          @Result(property = "parentId", column = "parent_Id"), 
          @Result(property = "userList", many 
//"groupId=group_id",相当于将主查询中的列group_id映射到查询参数groupId中
//"userName=user_name",相当于将主查询中的列user_name映射到查询参数userName中
=@Many(select="selectUsersByGroupId"), column = "{groupId=group_id ,userName=user_name}")})
List<Group> selectGroupWithUsers(@Param("accountId") String accountId);
 
 
@Select({"select u.* from user u",
		"inner join user_group ug on u.user_id = ug.user_id",
		"where ug.group_id=#{groupId} and u.user_name=#{userName} and u.delete_flag=0"
		})
List<User> selectUsersByGroupId(@Param("groupId") String groupId, @Param("userName") String userName);

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    一对多

    再实战一个不用中间表的一对多的例子

    数据表结构

    1.主表(bfs_nota1001)

    CREATE TABLE `bfs_nota1001` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '与业务无关的自增主键',
  `f_notaunikey` char(32) NOT NULL COMMENT '标识一条记录的key,由业务字段的MD5成的32个字节的字符串',
  `f_head` char(12) NOT NULL COMMENT '报文头,长度(字节): 12',
  `f_msgtype` varchar(100) NOT NULL COMMENT '消息类型,',
  `f_drivercode` char(9) NOT NULL COMMENT '设备编号,长度(字节): 9',
  `f_qr_cdrivercode` varchar(9) NOT NULL COMMENT 'QR设备编号,长度(字节): 9',
  `f_qr_fdatetime` timestamp NOT NULL COMMENT 'QR封包时间',
  `f_qr_randomnum` char(5) NOT NULL COMMENT 'QR钞捆序号,长度(字节): 5',
  PRIMARY KEY (`id`),
  UNIQUE KEY `bfs_nota1001_un` (`f_notaunikey`)
);

INSERT INTO `bfs_nota1001` VALUES (1,'3c496a9cac5986b5e9dc876f4f0401ff','GDAP20200527','1001','M02000930','M02000429','2020-05-27 09:28:39','20022');


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    2.子表(bfs_nota1001_detail)

    CREATE TABLE `bfs_nota1001_detail` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '与业务无关的自增主键',
  `f_notaunikey` char(32) NOT NULL COMMENT '标识一条记录的key,由相关的表bfs_nota1001的字段f_notaunikey来赋值',
  `f_detailunikey` char(32) NOT NULL COMMENT '标识一条记录的key,由业务字段的MD5成的32个字节的字符串',
  `f_moneyslogan` char(2) NOT NULL COMMENT '钞口号,长度(字节): 2',
  `f_keynum` char(5) NOT NULL COMMENT '把号,长度(字节): 5',
  `f_backcode` char(5) NOT NULL COMMENT '银行缩写,长度(字节): 5',
  `f_detailbacksx` char(9) NOT NULL COMMENT '银行代码,长度(字节): 9',
  `f_drvercode` char(9) NOT NULL COMMENT '设备编号,长度(字节): 9',
  `f_btime` timestamp NOT NULL COMMENT '时间,长度(字节): 12',
  `f_coupons` char(3) NOT NULL COMMENT '券别,长度(字节): 3',
  `f_couponcount` int(11) NOT NULL COMMENT '张数,长度(字节): 4',
  `f_couponvalue` int(11) NOT NULL COMMENT '金额,长度(字节): 6',
  `f_revision` varchar(10) NOT NULL COMMENT '版本,长度(字节): 10',
  PRIMARY KEY (`id`),
  UNIQUE KEY `bfs_nota1001_detail_un` (`f_detailunikey`),
  KEY `bfs_nota1001_detail_key` (`f_notaunikey`)
);

INSERT INTO `bfs_nota1001_detail` VALUES (1,'3c496a9cac5986b5e9dc876f4f0401ff','e5d73440e633b7783eb3fb957ae60e3','02','00019','51000','771600110','M02000429','2020-05-27 09:27:49','100',100,10000,'2015FIT   '),(2,'3c496a9cac5986b5e9dc876f4f0401ff','ad2a34af3038a87f263b8f9ea771e4f1','02','00016','51000','771600110','M02000429','2020-05-27 09:27:51','100',100,10000,'2015FIT   '),(3,'3c496a9cac5986b5e9dc876f4f0401ff','75a42347de99ece9d706dbb7c804ca0d','02','00018','51000','771600110','M02000429','2020-05-27 09:27:54','100',100,10000,'2015FIT   '),(4,'3c496a9cac5986b5e9dc876f4f0401ff','92e78b01edb6e03f3746c284e80ebc73','02','00014','51000','771600110','M02000429','2020-05-27 09:27:56','100',100,10000,'2015FIT   '),(5,'3c496a9cac5986b5e9dc876f4f0401ff','b95e2e493947c5f522546b6fa4d3ba3d','01','00022','51000','771600110','M02000429','2020-05-27 09:27:59','100',100,10000,'2015FIT   '),(6,'3c496a9cac5986b5e9dc876f4f0401ff','a5efae152a9da726807e5c9a743c1b6d','01','00025','51000','771600110','M02000429','2020-05-27 09:28:01','100',100,10000,'2015FIT   '),(7,'3c496a9cac5986b5e9dc876f4f0401ff','68cb897a34180f92a606aa5a73f20a0b','02','00015','51000','771600110','M02000429','2020-05-27 09:28:04','100',100,10000,'2015FIT   '),(8,'3c496a9cac5986b5e9dc876f4f0401ff','24ffd138d550e59243b1c65504c24d6a','01','00017','51000','771600110','M02000429','2020-05-27 09:28:06','100',100,10000,'2015FIT   '),(9,'3c496a9cac5986b5e9dc876f4f0401ff','ff9b18003d7f730a77deabeba6fd453d','02','00012','51000','771600110','M02000429','2020-05-27 09:28:09','100',100,10000,'2015FIT   '),(10,'3c496a9cac5986b5e9dc876f4f0401ff','c9ab32450ec9154b84b3ad98918030e2','01','00024','51000','771600110','M02000429','2020-05-27 09:28:12','100',100,10000,'2015FIT   ');

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    实体类:

    1.主类(BfsNota1001)

    package wjw.test.mybatisplus.slave.vo;

import java.io.Serializable;
import java.time.LocalDateTime;
import java.util.List;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;

public class BfsNota1001 implements Serializable {

  private static final long serialVersionUID = 1L;

  @TableId(
      type = IdType.AUTO)
  /**
   * 与业务无关的自增主键
   */
  private Long id;

  /**
   * 标识一条记录的key，由业务字段的md5成的32个字节的字符串
   */
  private String fNotaunikey;

  /**
   * 报文头，长度(字节)
   */
  private String fHead;

  /**
   * 消息类型，
   */
  private String fMsgtype;

  /**
   * 设备编号，长度(字节)
   */
  private String fDrivercode;

  /**
   * qr设备编号，长度(字节)
   */
  private String fQrCdrivercode;

  /**
   * qr封包时间
   */
  private LocalDateTime fQrFdatetime;

  /**
   * qr钞捆序号，长度(字节)
   */
  private String fQrRandomnum;

  private List<BfsNota1001Detail> details;

  public BfsNota1001() {
  }

  public Long getId() {
    return id;
  }

  public void setId(Long id) {
    this.id = id;
  }

  public String getfNotaunikey() {
    return fNotaunikey;
  }

  public void setfNotaunikey(String fNotaunikey) {
    this.fNotaunikey = fNotaunikey;
  }

  public String getfHead() {
    return fHead;
  }

  public void setfHead(String fHead) {
    this.fHead = fHead;
  }

  public String getfMsgtype() {
    return fMsgtype;
  }

  public void setfMsgtype(String fMsgtype) {
    this.fMsgtype = fMsgtype;
  }

  public String getfDrivercode() {
    return fDrivercode;
  }

  public void setfDrivercode(String fDrivercode) {
    this.fDrivercode = fDrivercode;
  }

  public String getfQrCdrivercode() {
    return fQrCdrivercode;
  }

  public void setfQrCdrivercode(String fQrCdrivercode) {
    this.fQrCdrivercode = fQrCdrivercode;
  }

  public LocalDateTime getfQrFdatetime() {
    return fQrFdatetime;
  }

  public void setfQrFdatetime(LocalDateTime fQrFdatetime) {
    this.fQrFdatetime = fQrFdatetime;
  }

  public String getfQrRandomnum() {
    return fQrRandomnum;
  }

  public void setfQrRandomnum(String fQrRandomnum) {
    this.fQrRandomnum = fQrRandomnum;
  }

  public List<BfsNota1001Detail> getDetails() {
    return details;
  }

  public void setDetails(List<BfsNota1001Detail> details) {
    this.details = details;
  }

  @Override
  public String toString() {
    StringBuilder builder = new StringBuilder();
    builder.append("BfsNota1001 [id=");
    builder.append(id);
    builder.append(", fNotaunikey=");
    builder.append(fNotaunikey);
    builder.append(", fHead=");
    builder.append(fHead);
    builder.append(", fMsgtype=");
    builder.append(fMsgtype);
    builder.append(", fDrivercode=");
    builder.append(fDrivercode);
    builder.append(", fQrCdrivercode=");
    builder.append(fQrCdrivercode);
    builder.append(", fQrFdatetime=");
    builder.append(fQrFdatetime);
    builder.append(", fQrRandomnum=");
    builder.append(fQrRandomnum);
    builder.append(", details=");
    builder.append(details);
    builder.append("]");
    return builder.toString();
  }

}


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    2.子类(BfsNota1001Detail):

    package wjw.test.mybatisplus.slave.vo;

import java.io.Serializable;
import java.time.LocalDateTime;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;

public class BfsNota1001Detail implements Serializable {

    private static final long serialVersionUID = 1L;

    @TableId(type = IdType.AUTO)
    /**
    * 与业务无关的自增主键
    */
    private Long id;

    /**
    * 标识一条记录的key，由相关的表bfs_nota1001的字段f_notaunikey来赋值
    */
    private String fNotaunikey;

    /**
    * 标识一条记录的key，由业务字段的md5成的32个字节的字符串
    */
    private String fDetailunikey;

    /**
    * 钞口号，长度(字节)
    */
    private String fMoneyslogan;

    /**
    * 把号，长度(字节)
    */
    private String fKeynum;

    /**
    * 银行缩写，长度(字节)
    */
    private String fBackcode;

    /**
    * 银行代码，长度(字节)
    */
    private String fDetailbacksx;

    /**
    * 设备编号，长度(字节)
    */
    private String fDrvercode;

    /**
    * 时间，长度(字节)
    */
    private LocalDateTime fBtime;

    /**
    * 券别，长度(字节)
    */
    private String fCoupons;

    /**
    * 张数，长度(字节)
    */
    private Integer fCouponcount;

    /**
    * 金额，长度(字节)
    */
    private Integer fCouponvalue;

    /**
    * 版本，长度(字节)
    */
    private String fRevision;

    public BfsNota1001Detail() {
    }

    public Long getId() {
      return id;
    }

    public void setId(Long id) {
      this.id = id;
    }

    public String getfNotaunikey() {
      return fNotaunikey;
    }

    public void setfNotaunikey(String fNotaunikey) {
      this.fNotaunikey = fNotaunikey;
    }

    public String getfDetailunikey() {
      return fDetailunikey;
    }

    public void setfDetailunikey(String fDetailunikey) {
      this.fDetailunikey = fDetailunikey;
    }

    public String getfMoneyslogan() {
      return fMoneyslogan;
    }

    public void setfMoneyslogan(String fMoneyslogan) {
      this.fMoneyslogan = fMoneyslogan;
    }

    public String getfKeynum() {
      return fKeynum;
    }

    public void setfKeynum(String fKeynum) {
      this.fKeynum = fKeynum;
    }

    public String getfBackcode() {
      return fBackcode;
    }

    public void setfBackcode(String fBackcode) {
      this.fBackcode = fBackcode;
    }

    public String getfDetailbacksx() {
      return fDetailbacksx;
    }

    public void setfDetailbacksx(String fDetailbacksx) {
      this.fDetailbacksx = fDetailbacksx;
    }

    public String getfDrvercode() {
      return fDrvercode;
    }

    public void setfDrvercode(String fDrvercode) {
      this.fDrvercode = fDrvercode;
    }

    public LocalDateTime getfBtime() {
      return fBtime;
    }

    public void setfBtime(LocalDateTime fBtime) {
      this.fBtime = fBtime;
    }

    public String getfCoupons() {
      return fCoupons;
    }

    public void setfCoupons(String fCoupons) {
      this.fCoupons = fCoupons;
    }

    public Integer getfCouponcount() {
      return fCouponcount;
    }

    public void setfCouponcount(Integer fCouponcount) {
      this.fCouponcount = fCouponcount;
    }

    public Integer getfCouponvalue() {
      return fCouponvalue;
    }

    public void setfCouponvalue(Integer fCouponvalue) {
      this.fCouponvalue = fCouponvalue;
    }

    public String getfRevision() {
      return fRevision;
    }

    public void setfRevision(String fRevision) {
      this.fRevision = fRevision;
    }

    @Override
    public String toString() {
      StringBuilder builder = new StringBuilder();
      builder.append("BfsNota1001Detail [id=");
      builder.append(id);
      builder.append(", fNotaunikey=");
      builder.append(fNotaunikey);
      builder.append(", fDetailunikey=");
      builder.append(fDetailunikey);
      builder.append(", fMoneyslogan=");
      builder.append(fMoneyslogan);
      builder.append(", fKeynum=");
      builder.append(fKeynum);
      builder.append(", fBackcode=");
      builder.append(fBackcode);
      builder.append(", fDetailbacksx=");
      builder.append(fDetailbacksx);
      builder.append(", fDrvercode=");
      builder.append(fDrvercode);
      builder.append(", fBtime=");
      builder.append(fBtime);
      builder.append(", fCoupons=");
      builder.append(fCoupons);
      builder.append(", fCouponcount=");
      builder.append(fCouponcount);
      builder.append(", fCouponvalue=");
      builder.append(fCouponvalue);
      builder.append(", fRevision=");
      builder.append(fRevision);
      builder.append("]");
      return builder.toString();
    }

}


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    Mapper类:

    BfsNota1001DetailMapper:

    package wjw.test.mybatisplus.slave.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;

import wjw.test.mybatisplus.slave.vo.BfsNota1001Detail;

@Mapper
public interface BfsNota1001DetailMapper extends BaseMapper<BfsNota1001Detail> {
  
  @Select("select * from bfs_nota1001_detail where f_notaunikey=#{fNotaunikey}")
  @Results({@Result(id=true,column="id",property="id"),
    @Result(column = "f_notaunikey",property = "fNotaunikey"),
    @Result(column = "f_detailunikey",property = "fDetailunikey"),
    @Result(column = "f_moneyslogan",property = "fMoneyslogan"),
    @Result(column = "f_keynum",property = "fKeynum"),
    @Result(column = "f_backcode",property = "fBackcode"),
    @Result(column = "f_detailbacksx",property = "fDetailbacksx"),
    @Result(column = "f_drvercode",property = "fDrvercode"),
    @Result(column = "f_btime",property = "fBtime"),
    @Result(column = "f_coupons",property = "fCoupons"),
    @Result(column = "f_couponcount",property = "fCouponcount"),
    @Result(column = "f_couponvalue",property = "fCouponvalue"),
    @Result(column = "f_revision",property = "fRevision")
  })
  List<BfsNota1001Detail> getListByNotaunikey(@Param("fNotaunikey")String fNotaunikey);    
}


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    BfsNota1001Mapper:

    package wjw.test.mybatisplus.slave.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Many;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;

import wjw.test.mybatisplus.slave.vo.BfsNota1001;
import wjw.test.mybatisplus.slave.vo.BfsNota1001Detail;

@Mapper
public interface BfsNota1001Mapper extends BaseMapper<BfsNota1001> {
    //OneToMany一对多查询
    @Select("select * from bfs_nota1001 where id=#{id}")
    @Results({@Result(column = "id",property = "id",id=true),
      @Result(column = "f_notaunikey",property = "fNotaunikey"),
      @Result(column = "f_head",property = "fHead"),
      @Result(column = "f_msgtype",property = "fMsgtype"),
      @Result(column = "f_drivercode",property = "fDrivercode"),
      @Result(column = "f_qr_cdrivercode",property = "fQrCdrivercode"),
      @Result(column = "f_qr_fdatetime",property = "fQrFdatetime"),
      @Result(column = "f_qr_randomnum",property = "fQrRandomnum"),
              @Result(column = "f_notaunikey" /* 主查询里的列名,这里的f_notaunikey是要传递给下面查询里需要的参数 */,
                      property = "details" /* 这里是BfsNota1001Vo类里的details字段 */,many=@Many(
                      select = "wjw.test.mybatisplus.slave.mapper.BfsNota1001DetailMapper.getListByNotaunikey"
              ))
    })
    List<BfsNota1001> getList(@Param("id")Integer id);
}


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    测试

    package wjw.test.mybatisplus;

import java.util.List;

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
import org.springframework.test.context.ActiveProfiles;

import wjw.test.mybatisplus.slave.mapper.BfsNota1001DetailMapper;
import wjw.test.mybatisplus.slave.mapper.BfsNota1001Mapper;
import wjw.test.mybatisplus.slave.vo.BfsNota1001;

@SpringBootTest(webEnvironment = WebEnvironment.NONE)
public class MybatisPlusTestSlave {
  @Autowired
  private BfsNota1001Mapper b1001Mapper;

  public MybatisPlusTestSlave() {
    //
  }

  @BeforeEach
  public void setup() {
    //
  }

  @AfterEach
  public void stop() {
  }

  @Test
  public void get1001() {
    List<BfsNota1001> list = b1001Mapper.getList(1);
    System.out.println(list);
  }

}


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    输出结果:

    w.t.m.slave.mapper.BfsNota1001Mapper.getList - [debug,137] - ==>  Preparing: select * from bfs_nota1001 where id=?
w.t.m.slave.mapper.BfsNota1001Mapper.getList - [debug,137] - ==> Parameters: 1(Integer)
w.t.m.slave.mapper.BfsNota1001Mapper.getList - [trace,143] - <==    Columns: id, f_notaunikey, f_head, f_msgtype, f_drivercode, f_qr_cdrivercode, f_qr_fdatetime, f_qr_randomnum
w.t.m.slave.mapper.BfsNota1001Mapper.getList - [trace,143] - <==        Row: 1, 3c496a9cac5986b5e9dc876f4f0401ff, GDAP20200527, 1001, M02000930, M02000429, 2020-05-27 17:28:39.0, 20022
w.t.m.s.m.B.getListByNotaunikey - [debug,137] - ====>  Preparing: select * from bfs_nota1001_detail where f_notaunikey=?
w.t.m.s.m.B.getListByNotaunikey - [debug,137] - ====> Parameters: 3c496a9cac5986b5e9dc876f4f0401ff(String)
w.t.m.s.m.B.getListByNotaunikey - [trace,143] - <====    Columns: id, f_notaunikey, f_detailunikey, f_moneyslogan, f_keynum, f_backcode, f_detailbacksx, f_drvercode, f_btime, f_coupons, f_couponcount, f_couponvalue, f_revision
w.t.m.s.m.B.getListByNotaunikey - [trace,143] - <====        Row: 1, 3c496a9cac5986b5e9dc876f4f0401ff, e5d73440e633b7783eb3fb957ae60e3, 02, 00019, 51000, 771600110, M02000429, 2020-05-27 17:27:49.0, 100, 100, 10000, 2015FIT   
w.t.m.s.m.B.getListByNotaunikey - [trace,143] - <====        Row: 2, 3c496a9cac5986b5e9dc876f4f0401ff, ad2a34af3038a87f263b8f9ea771e4f1, 02, 00016, 51000, 771600110, M02000429, 2020-05-27 17:27:51.0, 100, 100, 10000, 2015FIT   
w.t.m.s.m.B.getListByNotaunikey - [trace,143] - <====        Row: 3, 3c496a9cac5986b5e9dc876f4f0401ff, 75a42347de99ece9d706dbb7c804ca0d, 02, 00018, 51000, 771600110, M02000429, 2020-05-27 17:27:54.0, 100, 100, 10000, 2015FIT   
w.t.m.s.m.B.getListByNotaunikey - [trace,143] - <====        Row: 4, 3c496a9cac5986b5e9dc876f4f0401ff, 92e78b01edb6e03f3746c284e80ebc73, 02, 00014, 51000, 771600110, M02000429, 2020-05-27 17:27:56.0, 100, 100, 10000, 2015FIT   
w.t.m.s.m.B.getListByNotaunikey - [trace,143] - <====        Row: 5, 3c496a9cac5986b5e9dc876f4f0401ff, b95e2e493947c5f522546b6fa4d3ba3d, 01, 00022, 51000, 771600110, M02000429, 2020-05-27 17:27:59.0, 100, 100, 10000, 2015FIT   
w.t.m.s.m.B.getListByNotaunikey - [trace,143] - <====        Row: 6, 3c496a9cac5986b5e9dc876f4f0401ff, a5efae152a9da726807e5c9a743c1b6d, 01, 00025, 51000, 771600110, M02000429, 2020-05-27 17:28:01.0, 100, 100, 10000, 2015FIT   
w.t.m.s.m.B.getListByNotaunikey - [trace,143] - <====        Row: 7, 3c496a9cac5986b5e9dc876f4f0401ff, 68cb897a34180f92a606aa5a73f20a0b, 02, 00015, 51000, 771600110, M02000429, 2020-05-27 17:28:04.0, 100, 100, 10000, 2015FIT   
w.t.m.s.m.B.getListByNotaunikey - [trace,143] - <====        Row: 8, 3c496a9cac5986b5e9dc876f4f0401ff, 24ffd138d550e59243b1c65504c24d6a, 01, 00017, 51000, 771600110, M02000429, 2020-05-27 17:28:06.0, 100, 100, 10000, 2015FIT   
w.t.m.s.m.B.getListByNotaunikey - [trace,143] - <====        Row: 9, 3c496a9cac5986b5e9dc876f4f0401ff, ff9b18003d7f730a77deabeba6fd453d, 02, 00012, 51000, 771600110, M02000429, 2020-05-27 17:28:09.0, 100, 100, 10000, 2015FIT   
w.t.m.s.m.B.getListByNotaunikey - [trace,143] - <====        Row: 10, 3c496a9cac5986b5e9dc876f4f0401ff, c9ab32450ec9154b84b3ad98918030e2, 01, 00024, 51000, 771600110, M02000429, 2020-05-27 17:28:12.0, 100, 100, 10000, 2015FIT   
w.t.m.s.m.B.getListByNotaunikey - [debug,137] - <====      Total: 10
w.t.m.slave.mapper.BfsNota1001Mapper.getList - [debug,137] - <==      Total: 1
[BfsNota1001 [id=1, fNotaunikey=3c496a9cac5986b5e9dc876f4f0401ff, fHead=GDAP20200527, fMsgtype=1001, fDrivercode=M02000930, fQrCdrivercode=M02000429, fQrFdatetime=2020-05-27T17:28:39, fQrRandomnum=20022, details=[BfsNota1001Detail [id=1, fNotaunikey=3c496a9cac5986b5e9dc876f4f0401ff, fDetailunikey=e5d73440e633b7783eb3fb957ae60e3, fMoneyslogan=02, fKeynum=00019, fBackcode=51000, fDetailbacksx=771600110, fDrvercode=M02000429, fBtime=2020-05-27T17:27:49, fCoupons=100, fCouponcount=100, fCouponvalue=10000, fRevision=2015FIT   ], BfsNota1001Detail [id=2, fNotaunikey=3c496a9cac5986b5e9dc876f4f0401ff, fDetailunikey=ad2a34af3038a87f263b8f9ea771e4f1, fMoneyslogan=02, fKeynum=00016, fBackcode=51000, fDetailbacksx=771600110, fDrvercode=M02000429, fBtime=2020-05-27T17:27:51, fCoupons=100, fCouponcount=100, fCouponvalue=10000, fRevision=2015FIT   ], BfsNota1001Detail [id=3, fNotaunikey=3c496a9cac5986b5e9dc876f4f0401ff, fDetailunikey=75a42347de99ece9d706dbb7c804ca0d, fMoneyslogan=02, fKeynum=00018, fBackcode=51000, fDetailbacksx=771600110, fDrvercode=M02000429, fBtime=2020-05-27T17:27:54, fCoupons=100, fCouponcount=100, fCouponvalue=10000, fRevision=2015FIT   ], BfsNota1001Detail [id=4, fNotaunikey=3c496a9cac5986b5e9dc876f4f0401ff, fDetailunikey=92e78b01edb6e03f3746c284e80ebc73, fMoneyslogan=02, fKeynum=00014, fBackcode=51000, fDetailbacksx=771600110, fDrvercode=M02000429, fBtime=2020-05-27T17:27:56, fCoupons=100, fCouponcount=100, fCouponvalue=10000, fRevision=2015FIT   ], BfsNota1001Detail [id=5, fNotaunikey=3c496a9cac5986b5e9dc876f4f0401ff, fDetailunikey=b95e2e493947c5f522546b6fa4d3ba3d, fMoneyslogan=01, fKeynum=00022, fBackcode=51000, fDetailbacksx=771600110, fDrvercode=M02000429, fBtime=2020-05-27T17:27:59, fCoupons=100, fCouponcount=100, fCouponvalue=10000, fRevision=2015FIT   ], BfsNota1001Detail [id=6, fNotaunikey=3c496a9cac5986b5e9dc876f4f0401ff, fDetailunikey=a5efae152a9da726807e5c9a743c1b6d, fMoneyslogan=01, fKeynum=00025, fBackcode=51000, fDetailbacksx=771600110, fDrvercode=M02000429, fBtime=2020-05-27T17:28:01, fCoupons=100, fCouponcount=100, fCouponvalue=10000, fRevision=2015FIT   ], BfsNota1001Detail [id=7, fNotaunikey=3c496a9cac5986b5e9dc876f4f0401ff, fDetailunikey=68cb897a34180f92a606aa5a73f20a0b, fMoneyslogan=02, fKeynum=00015, fBackcode=51000, fDetailbacksx=771600110, fDrvercode=M02000429, fBtime=2020-05-27T17:28:04, fCoupons=100, fCouponcount=100, fCouponvalue=10000, fRevision=2015FIT   ], BfsNota1001Detail [id=8, fNotaunikey=3c496a9cac5986b5e9dc876f4f0401ff, fDetailunikey=24ffd138d550e59243b1c65504c24d6a, fMoneyslogan=01, fKeynum=00017, fBackcode=51000, fDetailbacksx=771600110, fDrvercode=M02000429, fBtime=2020-05-27T17:28:06, fCoupons=100, fCouponcount=100, fCouponvalue=10000, fRevision=2015FIT   ], BfsNota1001Detail [id=9, fNotaunikey=3c496a9cac5986b5e9dc876f4f0401ff, fDetailunikey=ff9b18003d7f730a77deabeba6fd453d, fMoneyslogan=02, fKeynum=00012, fBackcode=51000, fDetailbacksx=771600110, fDrvercode=M02000429, fBtime=2020-05-27T17:28:09, fCoupons=100, fCouponcount=100, fCouponvalue=10000, fRevision=2015FIT   ], BfsNota1001Detail [id=10, fNotaunikey=3c496a9cac5986b5e9dc876f4f0401ff, fDetailunikey=c9ab32450ec9154b84b3ad98918030e2, fMoneyslogan=01, fKeynum=00024, fBackcode=51000, fDetailbacksx=771600110, fDrvercode=M02000429, fBtime=2020-05-27T17:28:12, fCoupons=100, fCouponcount=100, fCouponvalue=10000, fRevision=2015FIT   ]]]]


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    后记:

    MyBatis中常用的一对多查询是 N+1 方式的查询,即先查询主表再查询子表.这就是著名的 [n+1 问题] 。如果记录很多，这种查询效率是非常低效的。

    有没有只需要一条SQL查询就能搞定一对多关系的呢? 请看下面的进阶文章Mybatis巧用@Many注解让一条SQL联合查询语句完成一对多查询 !

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  • 原文地址：https://blog.csdn.net/wjw465150/article/details/126732720