如何通過CrudRepository在數據庫中保存包含另一個實體的新實體？

Question

我試圖通過其他使用JSON一些數據添加到數據庫：

{ 
    "id": null, 
    "basicInfo": { 
     "firstName": "Mistral", 
     "lastName": "Castrol", 
     "pesel": "45789623456", 
     "startDate": "2017-02-12" 
    }, 
    "contactInfo": { 
     "id": null, 
     "email": "wp@pw.pl", 
     "phoneNumber": "456789123", 
     "address": { 
      "houseNamber": 53, 
      "apartmentNumber": 25, 
      "street": { 
       "id": 1, 
       "name": "Koszmarna", 
       "city": { 
        "id": 2, 
        "name": "Radzyń Podlaski", 
        "voivodeship": { 
         "id": 2, 
         "name": "mazowieckie" 
        }, 
        "zipCode": "21-307" 
       } 
      } 
     } 
    }, 
    "bornInfo": { 
     "id": null, 
     "bornDate": "2018-02-14", 
     "city": { 
      "id": 1, 
      "name": "Siedlce", 
      "voivodeship": { 
       "id": 1, 
       "name": "śląskie" 
      }, 
      "zipCode": "21-307" 
     } 
    } 
} 

。我失去耐心。很多小時google搜索和嘗試後，我卡在此錯誤：

"message": "detached entity passed to persist: pl.dn.model.placeInfo.City; nested exception is org.hibernate.PersistentObjectException: detached entity passed to persist: pl.dn.model.placeInfo.City"

的問題是城市（分離）的實體已經存在於數據庫中，但喜歡的firstName另一個數據，二是transisent實體的一部分。我不知道我應該 modfify json或模型。

型號：

主持人

@Entity 
public class Moderator { 

    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    private long id; 

    @Embedded 
    private BasicInfo basicInfo; 

    @OneToOne(cascade = CascadeType.ALL) 
    @JoinColumn(name = "contact_info_id") 
    private ModeratorContactInfo contactInfo; 

    @OneToOne(cascade = CascadeType.ALL) 
    @JoinColumn(name = "born_info_id") 
    private ModeratorBornInfo bornInfo; 

} 

ModeratorContactInfo

@Entity 
@Table(name = "moderator_contact_info") 
public class ModeratorContactInfo { 

    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    private long id; 

    private String email; 

    @Column(name = "phone_number") 
    private String phoneNumber; 

    @Embedded 
    private Address address; 

} 

地址

@Embeddable 
public class Address { 

    @Column(name = "house_number") 
    private long houseNamber; 

    @Column(name = "apratment_number") 
    private long apartmentNumber; 

    @ManyToOne(cascade = CascadeType.ALL) 
    @JoinColumn(name = "street_id") 
    private Street street; 

} 

街

@Entity 
public class Street { 

    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    private long id; 

    private String name; 

    @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER) 
    @JoinColumn(name = "city_id") 
    private City city; 

} 

市

@Entity 
@Table(name = "city") 
public class City { 

    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    private long id; 

    private String name; 

    @ManyToOne(cascade = CascadeType.ALL) 
    @JoinColumn(name = "voivodeship_id") 
    private Voivodeship voivodeship; 

    @Column(name = "zip_code", length = 6) 
    private String zipCode; 
} 

省

@Entity 
public class Voivodeship { 

    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    private long id; 

    private String name; 

} 

最後控制器的方法：

@RequestMapping(value = "add", method = RequestMethod.POST) 
    public String addModerator(@RequestBody Moderator moderator) { 

     return moderatorDao.save(moderator).toString(); 

    } 

時序解決方案：

如果我從數據庫加載城市並將其設置爲用戶，它將起作用，但我必須處理版主中的所有實體。

@RequestMapping(value = "add", method = RequestMethod.POST) 
    public String addModerator(@RequestBody Moderator moderator) { 

     long bornCityId = moderator.getBornInfo().getCity().getId(); 
     long contactCityId = moderator.getContactInfo().getAddress().getStreet().getCity().getId(); 

     if (! (bornCityId == 0)) { 
      City city = cityDao.findById(bornCityId); 
      moderator.getBornInfo().setCity(city); 
     } 

     if (! (contactCityId == 0)) { 
      City city = cityDao.findById(contactCityId); 
      moderator.getContactInfo().getAddress().getStreet().setCity(city); 
     } 

     return moderatorDao.save(moderator).toString(); 

    } 

Answer 1

我用ModeratorService來解決這個問題：

@Service 
public class ModeratorService { 

    @Autowired 
    private SessionFactory sessionFactory; 

    @Transactional 
    public Moderator save(Moderator moderator) { 

     Session session = sessionFactory.getCurrentSession(); 
     session.saveOrUpdate(moderator); 

     return moderator; 
    } 

} 

而改變控制器的方法：

@RequestMapping(value = "add", method = RequestMethod.POST) 
    public String add(@RequestBody Moderator moderator) { 

     return moderatorService.save(moderator).toString(); 

    }