myBatis实现三级嵌套复杂对象的赋值问题

2023-07-12 09:04:05 173

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)

packagecom.weima.cecapp.entities;

importlombok.Data;
importlombok.NoArgsConstructor;
importorg.hibernate.annotations.BatchSize;
importorg.hibernate.annotations.GenericGenerator;

importjavax.persistence.*;
importjava.util.Collections;
importjava.util.List;
importjava.util.Set;
@NoArgsConstructor
@Data
@Entity
@Table(name="station_info")
publicclassStationInfo{
/**
*Auto-generatedprimarykey.
*/
@Id
@GeneratedValue(generator="uuid")
@GenericGenerator(name="uuid",strategy="org.hibernate.id.UUIDGenerator")
@Column(unique=true,nullable=false,updatable=false)
privateStringid;

@Column(name="station_id")
privateStringstationId;

@Column(name="operator_id")
privateStringoperatorId;

@Column(name="equipment_owner_id")
privateStringequipmentOwnerId;

@Column
privateStringstationName;

@Column
privateStringcountryCode;

@Column
privateStringareaCode;

@Column
privateStringaddress;

@Column
privateStringstationTel;

@Column
privateStringserviceTel;

@Column
privateIntegerstationType;

@Column
privateIntegerstationStatus;

@Column
privateIntegerparkNums;

@Column
privateDoublestationLng;

@Column
privateDoublestationLat;

@Column
privateStringsiteGuide;

@Column
privateIntegerconstruction;

@OneToMany(fetch=FetchType.LAZY,cascade={CascadeType.ALL},orphanRemoval=true,mappedBy="ownerStationInfo")
privateListpictures;

@Column
privateStringmatchCars;

@Column
privateStringparkInfo;

@Column
privateStringbusineHours;

@Column(name="busine_hours_in_milliseconds")
privateLongbusineHoursInMilliseconds;

@Column
privateStringelectricityFee;

@Column
privateStringserviceFee;

@Column
privateStringparkFee;

@Column
privateStringpayment;

@Column
privateIntegersupportOrder;

@Column
privateStringremark;

@OneToMany(fetch=FetchType.LAZY,cascade={CascadeType.ALL},orphanRemoval=true,mappedBy="ownerStationInfo")
@BatchSize(size=20)
privateListequipmentInfos;

}

电站图片实体

packagecom.weima.cecapp.entities;

importlombok.Data;
importlombok.EqualsAndHashCode;
importlombok.ToString;
importorg.hibernate.annotations.GenericGenerator;

importjavax.persistence.*;

@Data
@Entity
@EqualsAndHashCode(of={"url"})
@ToString(exclude={"ownerStationInfo"})
@Table(name="station_picture")
publicclassStationPicture{
/**
*Auto-generatedprimarykey.
*/
@Id
@GeneratedValue(generator="uuid")
@GenericGenerator(name="uuid",strategy="org.hibernate.id.UUIDGenerator")
@Column(unique=true,nullable=false,insertable=true,updatable=false)
privateStringid;

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

@Column
privateStringurl;
}

电桩实体类

packagecom.weima.cecapp.entities;

importlombok.Data;
importlombok.EqualsAndHashCode;
importlombok.ToString;
importorg.hibernate.annotations.BatchSize;
importorg.hibernate.annotations.GenericGenerator;

importjavax.persistence.*;
importjava.text.ParseException;
importjava.text.SimpleDateFormat;
importjava.util.Collections;
importjava.util.List;

@Data
@Entity
@EqualsAndHashCode(of={"equipmentId"})
@ToString(exclude={"ownerStationInfo"})
@Table(name="equipment_info")
publicclassEquipmentInfo{
/**
*Auto-generatedprimarykey.
*/
@Id
@GeneratedValue(generator="uuid")
@GenericGenerator(name="uuid",strategy="org.hibernate.id.UUIDGenerator")
@Column(unique=true,nullable=false,updatable=false)
privateStringid;

@Column(name="equipment_id")
privateStringequipmentId;

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

@Column(name="manufacturer_id")
privateStringmanufacturerId;

@Column
privateStringmanufacturerName;

@Column
privateStringequipmentModel;

@Column
privateStringproductionDate;

publicStringgetProductionDate(){
Stringformat=null;
if(this.productionDate!=null){
SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd");
try{
format=sdf.format(sdf.parse(this.productionDate));
}catch(ParseExceptione){
e.printStackTrace();
}
returnformat;
}
returnformat;
}

@Column
privateStringequipmentType;

@OneToMany(fetch=FetchType.LAZY,orphanRemoval=true,mappedBy="ownerEquipmentInfo",cascade={CascadeType.PERSIST})
@BatchSize(size=20)
privateListconnectorInfos;

@Column
privateDoubleequipmentLng;

@Column
privateDoubleequipmentLat;

@Column
privateDoublepower;

@Column
privateStringequipmentName;

@Column(name="equipment_no")
//cpo'scustomequipmentIdmostlyforEvstation
privateStringequipmentNo;
}

电枪实体类

packagecom.weima.cecapp.entities;

importlombok.Data;
importlombok.EqualsAndHashCode;
importlombok.ToString;
importorg.hibernate.annotations.GenericGenerator;

importjavax.persistence.*;

@Data
@Entity
@EqualsAndHashCode(of={"connectorId"})
@ToString(exclude={"ownerEquipmentInfo"})
@Table(name="connector_info")
publicclassConnectorInfo{
/**
*Auto-generatedprimarykey.
*/
@Id
@GeneratedValue(generator="uuid")
@GenericGenerator(name="uuid",strategy="org.hibernate.id.UUIDGenerator")
@Column(unique=true,nullable=false,updatable=false)
privateStringid;

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

@Column(name="connector_id")
privateStringconnectorId;

@Column
privateStringconnectorName;

@Column
privateIntegerconnectorType;

@Column
privateIntegervoltageUpperLimits;

@Column
privateIntegervoltageLowerLimits;

@Column
privateIntegercurrent;

@Column
privateDoublepower;

@Column
privateStringparkNo;

@Column
privateIntegernationalStandard;

@Column(name="connector_no")
//cpo'scustomconnectorIdmostlyforEvstation
privateStringconnectorNo;
}

mapper文件的resultMap映射及Sql语句的书写，要特别注意映射关系





































































--要特别注意的是t_f_的前缀，这个关乎到映射不映射上的根本。

select
a.idasid,
a.station_idasstation_id,
a.operator_idasoperator_id,
a.equipment_owner_idasequipment_owner_id,
a.station_nameasstation_name,
a.country_codeascountry_code,
a.area_codeasarea_code,
a.addressasaddress,
a.station_telasstation_tel,
a.service_telasservice_tel,
a.station_typeasstation_type,
a.station_statusasstation_status,
a.park_numsaspark_nums,
a.station_lngasstation_lng,
a.station_latasstation_lat,
a.site_guideassite_guide,
a.constructionasconstruction,
a.match_carsasmatch_cars,
a.park_infoaspark_info,
a.busine_hoursasbusine_hours,
a.busine_hours_in_millisecondsasbusine_hours_in_milliseconds,
a.electricity_feeaselectricity_fee,
a.service_feeasservice_fee,
a.park_feeaspark_fee,
a.paymentaspayment,
a.support_orderassupport_order,
a.remarkasremark
,
e.idast_id,
e.equipment_idast_equipment_id,
e.equipment_latast_equipment_lat,
e.equipment_lngast_equipment_lng,
e.equipment_modelast_equipment_model,
e.equipment_nameast_equipment_name,
e.equipment_typeast_equipment_type,
e.manufacturer_idast_manufacturer_id,
e.manufacturer_nameast_manufacturer_name,
e.powerast_power,
e.production_dateast_production_date,
e.owner_station_info_idast_owner_station_info_id,
e.equipment_noast_equipment_no
,

c.idast_f_id,
c.powerast_f_power,
c.currentast_f_current,
c.park_noast_f_park_no,
c.connector_idast_f_connector_id,
c.connector_nameast_f_connector_name,
c.connector_typeast_f_connector_type,
c.connector_noast_f_connector_no,
c.national_standardast_f_national_standard,
c.voltage_lower_limitsast_f_voltage_lower_limits,
c.voltage_upper_limitsast_f_voltage_upper_limits,
c.owner_equipment_info_idast_f_owner_equipment_info_id

fromstation_infoajoinequipment_infoeona.id=e.owner_station_info_id

joinconnector_infocone.id=c.owner_equipment_info_id

wherea.operator_id='MA59J8YL8'

希望为遇到同样需求的同学提供到帮助。

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myBatis实现三级嵌套复杂对象的赋值问题

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