休眠 - 從多個領域同一個實體

Question

我有實體FooDetails，它有兩個領域的關係：客戶和位置的列表。客戶具有地址（@OneToOne單向映射），並且位置也具有使用@OneToOne映射的地址。

它發生在地址客戶和位置是相同的。所有這些對象來自遠程服務，我手動將ID從遠程對象放入實體中，然後再保存。映射如下所示：

@Entity 
@Table(name = "FOO") 
public class FooDetails { 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    @Column(name = "id") 
    private long id; 

    @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL) 
    @JoinColumn(name = "customer_id") 
    private Customer customer; 

    @OneToMany(cascade = CascadeType.ALL) 
    @JoinColumn(name = "details_id") 
    private Set<Location> locationList; 
... 
} 

@Entity 
@Table(name = "CUSTOMER") 
public class Customer { 

    @Id 
    @Column(name = "customer_id", unique = true) 
    private long customerId; 

    @OneToOne(cascade = CascadeType.ALL) 
    @JoinColumn(name = "address_id") 
    private Address address; 
... 
} 

@Entity 
@Table(name = "LOCATION") 
public class Location { 

    @Id 
    @Column(name = "location_id", unique = true) 
    private long locationId; 

    @OneToOne(cascade = CascadeType.ALL) 
    @JoinColumn(name = "address_id") 
    private Address address; 
... 
} 

@Entity 
@Table(name = "ADDRESS") 
public class Address{ 

    @Id 
    @Column(name = "address_id") 
    private long addressId; 
    ... 

    @Override 
    public boolean equals(Object o) { 
     if (this == o) return true; 
     if (!(o instanceof StawareAddress)) return false; 

     StawareAddress that = (StawareAddress) o; 

     return addressId == that.addressId; 
    } 

    @Override 
    public int hashCode() { 
     return (int) (addressId^(addressId >>> 32)); 
    } 
} 

當我從webservice收到整個FooDetails對象時，我嘗試將它保存到本地數據庫。

如果數據庫是乾淨的（沒有地址保存至今），與WS正確的ID地址保存。如果已經有一個帶有這個ID的地址，Hibernate會嘗試將新的一個插入到數據庫中，並且由於addressId上的唯一約束而出現錯誤。

我使用Spring JPA的數據保存實體（save（）方法）。

我錯過了什麼明顯的實體映射的問題？

Answer 1

我真的不鼓勵使用CascadeType.ALL這裏和手動處理。

public void saveFoodetails(FooDetails fooDetails) { 
    Address address = addressRepository.find(fooDetails.getAddress().getId()); 
    if (address != null) { 
    // perhaps you update address with data from fooDetails.getAddress() 
    addressRepository.save(address); 
    // associate attached address instance with fooDetails now. 
    fooDetails.setAddress(address); 
    } 
    else { 
    // save the new incoming address contained in FooDetails 
    addressRepository.save(fooDetails.getAddress()); 
    } 
    // now save/update FooDetails 
    fooDetailsRepository.save(fooDetails);   
}