双向映射休眠不会在两个相关实体上自动更新

分类：编程问答

如何解决双向映射休眠不会在两个相关实体上自动更新

我正在使用javaFx和Spring-Boot创建Hibernate应用程序，当我要保存其中包含其他实体列表的实体时遇到问题。

数据库结构： 

   CREATE TABLE IF NOT EXISTS AR_LANDLORD (
      AR_LANDLORD_ID INTEGER PRIMARY KEY AUTO_INCREMENT NOT NULL,FIRST_NAME VARCHAR(255) NOT NULL,SURNAME  VARCHAR(255) NOT NULL,LAST_NAME VARCHAR(255) NOT NULL,PIN NUMERIC NOT NULL,SETTLEMENT VARCHAR(255) NOT NULL,ADDRESS VARCHAR(255) NOT NULL,ADDRESS_NUMBER NUMERIC NOT NULL
    );
    
    CREATE TABLE IF NOT EXISTS AR_LANDLORD_PROPERTY(
      AR_LAND_PROPERTY_ID INTEGER PRIMARY KEY AUTO_INCREMENT NOT NULL,LAND VARCHAR(255) NOT NULL,LOCALITY VARCHAR(255)NOT NULL,EKATTE NUMERIC NOT NULL,CADASTRE_NUMBER VARCHAR(255) NOT NULL,PROPERTY_NUMBER NUMERIC NOT NULL,AREA FLOAT NOT NULL,AR_LANDLORD_ID INTEGER,foreign key (AR_LANDLORD_ID) references AR_LANDLORD(AR_LANDLORD_ID)
    );

DTOS：

地主：

    public class LandLord {
    
        private Long id;
        private String firstName;
        private String surname;
        private String lastName;
        private Long PIN;
        private String settlement;
        private String address;
        private Long addressNumber;
        private List<LandLordProperty> landLordProperties;
    
    
        public Long getId() {
            return id;
        }
    
        public void setId(Long id) {
            this.id = id;
        }
    
        public String getFirstName() {
            return firstName;
        }
    
        public void setFirstName(String firstName) {
            this.firstName = firstName;
        }
    
        public String getSurname() {
            return surname;
        }
    
        public void setSurname(String surname) {
            this.surname = surname;
        }
    
        public String getLastName() {
            return lastName;
        }
    
        public void setLastName(String lastName) {
            this.lastName = lastName;
        }
    
        public Long getPIN() {
            return PIN;
        }
    
        public void setPIN(Long PIN) {
            this.PIN = PIN;
        }
    
        public String getSettlement() {
            return settlement;
        }
    
        public void setSettlement(String settlement) {
            this.settlement = settlement;
        }
    
        public String getAddress() {
            return address;
        }
    
        public void setAddress(String address) {
            this.address = address;
        }
    
        public Long getAddressNumber() {
            return addressNumber;
        }
    
        public void setAddressNumber(Long addressNumber) {
            this.addressNumber = addressNumber;
        }
    
        public List<LandLordProperty> getLandLordProperties() {
            return landLordProperties;
        }
    
        public void setLandLordProperties(List<LandLordProperty> landLordProperties) {
            this.landLordProperties = landLordProperties;
        }
    
        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (!(o instanceof LandLord)) return false;
            LandLord landLord = (LandLord) o;
            return getId().equals(landLord.getId());
        }
    
        @Override
        public int hashCode() {
            return Objects.hash(getId());
        }
    }

LandLordProperty ：

public class LandLordProperty {

    private Long id;
    private String land;
    private String locality;
    private Long ekatte;
    private String cadastreNumber;
    private Long propertyNumber;
    private Float area;
    private Long landLordId;

    public Long getId() {
        return id;
    }

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

    public String getLand() {
        return land;
    }

    public void setLand(String land) {
        this.land = land;
    }

    public String getLocality() {
        return locality;
    }

    public void setLocality(String locality) {
        this.locality = locality;
    }

    public Long getEkatte() {
        return ekatte;
    }

    public void setEkatte(Long ekatte) {
        this.ekatte = ekatte;
    }

    public String getCadastreNumber() {
        return cadastreNumber;
    }

    public void setCadastreNumber(String cadastreNumber) {
        this.cadastreNumber = cadastreNumber;
    }

    public Long getPropertyNumber() {
        return propertyNumber;
    }

    public void setPropertyNumber(Long propertyNumber) {
        this.propertyNumber = propertyNumber;
    }

    public Float getArea() {
        return area;
    }

    public void setArea(Float area) {
        this.area = area;
    }

    public Long getLandLordId() {
        return landLordId;
    }

    public void setLandLordId(Long landLordId) {
        this.landLordId = landLordId;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof LandLordProperty)) return false;
        LandLordProperty that = (LandLordProperty) o;
        return getId().equals(that.getId());
    }

    @Override
    public int hashCode() {
        return Objects.hash(getId());
    }
}

实体：

LandLordEntity 

@Entity
@Table(name = "AR_LANDLORD")
public class LandLordEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "AR_LANDLORD_ID")
    private Long id;

    @Column(name = "FIRST_NAME")
    private String firstName;

    @Column(name = "SURNAME")
    private String surname;

    @Column(name = "LAST_NAME")
    private String lastName;

    @Column(name = "PIN")
    private Long PIN;

    @Column(name = "SETTLEMENT")
    private String settlement;

    @Column(name = "ADDRESS")
    private String address;

    @Column(name = "ADDRESS_NUMBER")
    private Long addressNumber;

    @OneToMany(fetch = FetchType.EAGER,orphanRemoval = true,mappedBy = "landLord",cascade = CascadeType.ALL)
    private List<LandLordPropertyEntity> landLordProperties = new ArrayList<>();

    public LandLordEntity(){}

    public LandLordEntity(Long id){
        this.id = id;
    }

    public Long getId() {
        return id;
    }

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

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getSurname() {
        return surname;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public Long getPIN() {
        return PIN;
    }

    public void setPIN(Long PIN) {
        this.PIN = PIN;
    }

    public String getSettlement() {
        return settlement;
    }

    public void setSettlement(String settlement) {
        this.settlement = settlement;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public Long getAddressNumber() {
        return addressNumber;
    }

    public void setAddressNumber(Long addressNumber) {
        this.addressNumber = addressNumber;
    }

    public List<LandLordPropertyEntity> getLandLordProperties() {
        return landLordProperties;
    }

    public void setLandLordProperties(List<LandLordPropertyEntity> landLordProperties) {
        this.landLordProperties = landLordProperties;
    }


    public static LandLord convertToDto(LandLordEntity entity) {
        LandLord dto = new LandLord();
        dto.setId(entity.getId());
        dto.setFirstName(entity.getFirstName());
        dto.setSurname(entity.getSurname());
        dto.setLastName(entity.getLastName());
        dto.setPIN(entity.getPIN());
        dto.setAddress(entity.getAddress());
        dto.setAddressNumber(entity.getAddressNumber());
        dto.setSettlement(entity.getSettlement());
        final List<LandLordPropertyEntity> landLordProperties = entity.getLandLordProperties();
        if (CollectionUtils.isNotEmpty(landLordProperties)) {
            dto.setLandLordProperties(landLordProperties.stream()
                    .map(LandLordPropertyEntity::convertToDto)
                    .collect(Collectors.toList()));
        }

        return dto;
    }

    public static LandLordEntity convertToEntity(LandLord dto) {

        LandLordEntity entity = new LandLordEntity();
        entity.setId(dto.getId());
        entity.setFirstName(dto.getFirstName());
        entity.setSurname(dto.getSurname());
        entity.setLastName(dto.getLastName());
        entity.setPIN(dto.getPIN());
        entity.setAddress(dto.getAddress());
        entity.setAddressNumber(dto.getAddressNumber());
        entity.setSettlement(dto.getSettlement());
        final List<LandLordProperty> landLordProperties = dto.getLandLordProperties();
        if (CollectionUtils.isNotEmpty(landLordProperties)) {
            entity.setLandLordProperties(landLordProperties.stream()
                    .map(LandLordPropertyEntity::convertToEntity)
                    .collect(Collectors.toList()));
        }

        return entity;
    }

}

LandLordPropertyEntity 

@Entity
@Table(name = "AR_LANDLORD_PROPERTY")
public class LandLordPropertyEntity {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "AR_LAND_PROPERTY_ID")
private Long id;

@Column(name = "LAND")
private String land;
@Column(name = "LOCALITY")
private String locality;
@Column(name = "EKATTE")
private Long ekatte;
@Column(name = "CADASTRE_NUMBER")
private String cadastreNumber;
@Column(name = "PROPERTY_NUMBER")
private Long propertyNumber;
@Column(name = "AREA")
private Float area;

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "AR_LANDLORD_ID")
private LandLordEntity landLord;

public LandLordPropertyEntity(){}

public LandLordPropertyEntity(Long id){
    this.id = id;
}

public Long getId() {
    return id;
}

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

public String getLand() {
    return land;
}

public void setLand(String land) {
    this.land = land;
}

public String getLocality() {
    return locality;
}

public void setLocality(String locality) {
    this.locality = locality;
}

public Long getEkatte() {
    return ekatte;
}

public void setEkatte(Long ekatte) {
    this.ekatte = ekatte;
}

public String getCadastreNumber() {
    return cadastreNumber;
}

public void setCadastreNumber(String cadastreNumber) {
    this.cadastreNumber = cadastreNumber;
}

public Long getPropertyNumber() {
    return propertyNumber;
}

public void setPropertyNumber(Long propertyNumber) {
    this.propertyNumber = propertyNumber;
}

public Float getArea() {
    return area;
}

public void setArea(Float area) {
    this.area = area;
}

public LandLordEntity getLandLord() {
    return landLord;
}

public void setLandLord(LandLordEntity landLord) {
    this.landLord = landLord;
}


public static LandLordProperty convertToDto(LandLordPropertyEntity entity) {
    LandLordProperty dto = new LandLordProperty();
    dto.setId(entity.getId());
    dto.setLand(entity.getLand());
    dto.setLocality(entity.getLocality());
    dto.setEkatte(entity.getEkatte());
    dto.setCadastreNumber(entity.getCadastreNumber());
    dto.setPropertyNumber(entity.getPropertyNumber());
    dto.setArea(entity.getArea());
    dto.setLandLordId(entity.getLandLord() != null ? entity.getLandLord().getId() : null);

    return dto;
}

public static LandLordPropertyEntity convertToEntity(LandLordProperty dto) {

    LandLordPropertyEntity entity = new LandLordPropertyEntity();

    entity.setId(dto.getId());
    entity.setLand(dto.getLand());
    entity.setLocality(dto.getLocality());
    entity.setEkatte(dto.getEkatte());
    entity.setCadastreNumber(dto.getCadastreNumber());
    entity.setPropertyNumber(dto.getPropertyNumber());
    entity.setArea(dto.getArea());
    entity.setLandLord(new LandLordEntity(dto.getLandLordId()));

    return entity;
}


}

服务创建方法 

public Long create(LandLord landLord) {
    final LandLordEntity landLordEntity = landLordRepository.save(LandLordEntity.convertToEntity(landLord));
    return landLordEntity.getId();
}

这是可执行代码 

    LandLord landLord = new LandLord();
    landLord.setFirstName("Dimitar");
    landLord.setSurname("Dimitrov");
    landLord.setLastName("Dimitrov");
    landLord.setPIN(555555L);
    landLord.setSettlement("Pz");
    landLord.setAddress("street Pz Pz");
    landLord.setAddressNumber(55L);
    List<LandLordProperty> landLordProperties  = new ArrayList<>();

    LandLordProperty landLordProperty = new LandLordProperty();
    landLordProperty.setArea(54F);
    landLordProperty.setCadastreNumber("11.11.34");
    landLordProperty.setEkatte(5444L);
    landLordProperty.setLocality("Test locality");
    landLordProperty.setLand("Test land");
    landLordProperty.setPropertyNumber(544L);
    landLordProperties.add(landLordProperty);

    landLord.setLandLordProperties(landLordProperties);

    landLordService.create(landLord);

请注意，有一些convert方法可以将实体从dto转换为dto。所以首先我在创建LandLord时遇到一个问题，它具有以下异常：

**Caused by: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : bg.gtechnology.agriculturerent.service.impl.model.LandLordPropertyEntity.landLord -> bg.gtechnology.agriculturerent.service.impl.model.LandLordEntity**

但是当我将cascade = CascadeType.ALL放在LandLordPropertyEntity的LandLordEntity字段中时，如下所示：

    @ManyToOne(fetch = FetchType.LAZY,cascade = CascadeType.ALL)
    @JoinColumn(name = "AR_LANDLORD_ID")
    private LandLordEntity landLord;

问题消失了，我还有另一个问题，它创建了两次实体。首先，我有一个空List<LandLordProperty>，第二个保存是让正确的List<LandLordProperty>持久保存正确的数据但它会再次创建一个对象LandLord，除属性列表外，其他所有地方都具有空值。因此，我认为不必添​​加此批注，并且我认为问题出在其他地方。我也注意到了这一点：

public static LandLordPropertyEntity convertToEntity(LandLordProperty dto)

当我删除entity.setLandLord(new LandLordEntity(dto.getLandLordId()));时，问题消失了，但我的列表为空。

因此，我在创建List<LandLordProperty>的LandLord对象时也要进行双向映射，而LandLordProperty对象中的landLordId也要自动保留。你能帮我吗？

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