休眠映射字段作爲主鍵和外鍵

Question

所以我有簡單的關係客戶端與他的類型。由於每個實體都通過id和源系統ID進行標識，因此我有無處不在的組合鍵。如何在保存客戶端實體時自動保存類型？

Client類：

public class Client implements Serializable { 

    @EmbeddedId 
    private ClientKey primaryKey; 

    @ManyToOne 
    @JoinColumns({ 
     @JoinColumn(insertable = false, updatable = false, name = "client_type", referencedColumnName = "dict_id"), 
     @JoinColumn(insertable = false, updatable = false, name = "client_own_id", referencedColumnName = "dict_own_id"), 
    }) 
    private Type type; 

} 

主鍵

@Embeddable 
public class ClientKey implements Serializable { 

    @Column(name = "client_id") 
    private String clientId; 
    @Column(name = "client_own_id") 
    private String clientOwnId; 

} 

型類

@Entity 
public class Type implements Serializable { 

    @EmbeddedId 
    private DictKey primaryKey; //dict_id and dict_own_id 

    ... 
} 

當我運行代碼：

clientRepo.create(client); //client contains setted type as typeRepo.getById(1). 

交易完成後，我保存了客戶端，但client_type列包含null。從我所瞭解的問題是可插入/可更新= false。所以我設置好的

@JoinColumn(insertable = true, updatable = true, name = "client_type", referencedColumnName = "dict_id"), //true since I want to have updated client_type field 
@JoinColumn(insertable = false, updatable = false, name = "client_own_id", referencedColumnName = "dict_own_id"), //false since I have this field in primary key already 

然後我得到：

Mixing insertable and non insertable columns in a property is not allowed 

，所以我都設置爲true：

@JoinColumn(insertable = true, updatable = true, name = "client_type", referencedColumnName = "dict_id"), //true since I want to have saved client_type field 
@JoinColumn(insertable = true, updatable = true, name = "client_own_id", referencedColumnName = "dict_own_id"), //true because I dont know why :D 

則：

repeated column in mapping for entity: Client column: client_own_id (should be mapped with insert="false" update="false") 

我沒有更多的想法...

編輯：下面 看起來不錯，只是當我有關係的客戶端實體：

@ManyToOne(fetch = FetchType.LAZY) 
    @JoinColumns({ 
    @JoinColumn(insertable = false, updatable = false, name = "client_id", referencedColumnName = "client_id"), 
    @JoinColumn(insertable = false, updatable = false, name = "client_own_id", referencedColumnName = "client_own_id"), 
}) 
    private Client client; 

我'越來越

Unable to find column with logical name: client_own_id in client 

Answer 1

看起來你這裏是什麼就是客戶端有一個情況一個複雜的密鑰，部分來源於它與Type的關聯。

在這種情況下，我覺得映射應如下：

實體類：

public class Client implements Serializable { 

    @EmbeddedId 
    private ClientKey primaryKey; 

    @MapsId("type") //maps to type in the EmbdeddedId 
    @ManyToOne 
    @JoinColumns({ 
     @JoinColumn(name = "client_type", referencedColumnName = "dict_id"), 
     @JoinColumn(name = "client_own_id", referencedColumnName = "dict_own_id") 
    }) 
    private Type type; 
} 

的EmbeddedId：

@Embeddable 
public class ClientKey implements Serializable { 
    @Column(name="client_id") 
    private String clientId; 

    @Embedded 
    private DictKey type; 

    //... 
}