myBatis实现三级嵌套复杂对象的赋值问题

平常我们工作中基本最多两级嵌套，但是有时候难免会遇到三级嵌套的业务场景，笔者最近就碰到了，使用一般的嵌套发现赋值为空，这可难倒了菜逼的我，后来在stackoverflow的帮助下终于搜到了解决办法，完美解决了问题，总结一下，方便有需要的同学，下面直接上栗子：

首先上实体类：三级嵌套如下（电站 —–> 电桩 —->电枪）

电站实体类 (实体为JPA写法，不影响mybatis的使用)

package com.weima.cecapp.entities;

import lombok.Data;
import lombok.NoArgsConstructor;
import org.hibernate.annotations.BatchSize;
import org.hibernate.annotations.GenericGenerator;

import javax.persistence.*;
import java.util.Collections;
import java.util.List;
import java.util.Set;
@NoArgsConstructor
@Data
@Entity
@Table(name = "station_info")
public class StationInfo {
  /**
   * Auto-generated primary key.
   */
  @Id
  @GeneratedValue(generator = "uuid")
  @GenericGenerator(name = "uuid", strategy = "org.hibernate.id.UUIDGenerator")
  @Column(unique = true, nullable = false, updatable = false)
  private String id;

  @Column(name = "station_id")
  private String stationId;

  @Column(name = "operator_id")
  private String operatorId;

  @Column(name = "equipment_owner_id")
  private String equipmentOwnerId;

  @Column
  private String stationName;

  @Column
  private String countryCode;

  @Column
  private String areaCode;

  @Column
  private String address;

  @Column
  private String stationTel;

  @Column
  private String serviceTel;

  @Column
  private Integer stationType;

  @Column
  private Integer stationStatus;

  @Column
  private Integer parkNums;

  @Column
  private Double stationLng;

  @Column
  private Double stationLat;

  @Column
  private String siteGuide;

  @Column
  private Integer construction;

  @OneToMany(fetch = FetchType.LAZY, cascade = {CascadeType.ALL}, orphanRemoval = true, mappedBy = "ownerStationInfo")
  private List<StationPicture> pictures;

  @Column
  private String matchCars;

  @Column
  private String parkInfo;

  @Column
  private String busineHours;

  @Column(name = "busine_hours_in_milliseconds")
  private Long busineHoursInMilliseconds;

  @Column
  private String electricityFee;

  @Column
  private String serviceFee;

  @Column
  private String parkFee;

  @Column
  private String payment;

  @Column
  private Integer supportOrder;

  @Column
  private String remark;

  @OneToMany(fetch = FetchType.LAZY, cascade = {CascadeType.ALL}, orphanRemoval = true, mappedBy = "ownerStationInfo")
  @BatchSize(size = 20)
  private List<EquipmentInfo> equipmentInfos;

}

电站图片实体

package com.weima.cecapp.entities;

import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.ToString;
import org.hibernate.annotations.GenericGenerator;

import javax.persistence.*;

@Data
@Entity
@EqualsAndHashCode(of = {"url"})
@ToString(exclude = {"ownerStationInfo"})
@Table(name = "station_picture")
public class StationPicture {
  /**
   * Auto-generated primary key.
   */
  @Id
  @GeneratedValue(generator = "uuid")
  @GenericGenerator(name = "uuid", strategy = "org.hibernate.id.UUIDGenerator")
  @Column(unique = true, nullable = false, insertable = true, updatable = false)
  private String id;

  @ManyToOne(fetch = FetchType.EAGER, optional = false)
  @JoinColumn(nullable = false, updatable = false)
  private StationInfo ownerStationInfo;

  @Column
  private String url;
}

电桩实体类

package com.weima.cecapp.entities;

import lombok.Data;
import lombok.EqualsAndHashC<strong>本文来源gaodai#ma#com搞@@代~&码网</strong>ode;
import lombok.ToString;
import org.hibernate.annotations.BatchSize;
import org.hibernate.annotations.GenericGenerator;

import javax.persistence.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Collections;
import java.util.List;

@Data
@Entity
@EqualsAndHashCode(of = {"equipmentId"})
@ToString(exclude = {"ownerStationInfo"})
@Table(name = "equipment_info")
public class EquipmentInfo {
  /**
   * Auto-generated primary key.
   */
  @Id
  @GeneratedValue(generator = "uuid")
  @GenericGenerator(name = "uuid", strategy = "org.hibernate.id.UUIDGenerator")
  @Column(unique = true, nullable = false, updatable = false)
  private String id;

  @Column(name = "equipment_id")
  private String equipmentId;

  @ManyToOne(fetch = FetchType.EAGER, optional = false)
  @JoinColumn(nullable = false, updatable = false)
  private StationInfo ownerStationInfo;

  @Column(name = "manufacturer_id")
  private String manufacturerId;

  @Column
  private String manufacturerName;

  @Column
  private String equipmentModel;

  @Column
  private String productionDate;

  public String getProductionDate() {
    String format = null;
    if (this.productionDate != null) {
      SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
      try {
        format = sdf.format(sdf.parse(this.productionDate));
      } catch (ParseException e) {
        e.printStackTrace();
      }
      return format;
    }
    return format;
  }

  @Column
  private String equipmentType;

  @OneToMany(fetch = FetchType.LAZY, orphanRemoval = true, mappedBy = "ownerEquipmentInfo", cascade = {CascadeType.PERSIST})
  @BatchSize(size = 20)
  private List<ConnectorInfo> connectorInfos;

  @Column
  private Double equipmentLng;

  @Column
  private Double equipmentLat;

  @Column
  private Double power;

  @Column
  private String equipmentName;

  @Column(name = "equipment_no")
  //cpo's custom equipmentId mostly for Evstation
  private String equipmentNo;
}

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