在複合鍵列上映射@OnetoOne

Question

首先，我有兩個實體文件夾和FolderObjectID及其相應的表。

上的文件夾表I具有複合鍵FolderID和ParentFolderID

Table Folder 
+----------------+ 
| Folder  | 
+----------------+ 
|#FolderID  | 
|#ParentFolderID | 
+----------------+ 

在FolderObjectID表我已經FolderObjectID作爲主鍵。

Table FolderObjectID 
+----------------+ 
| FolderObjectID | 
+----------------+ 
|#FolderObjectID | 
+----------------+ 

文件夾實體

@Entity 
@Table(name = "Folder") 
public class Folder implements java.io.Serializable { 

    private FolderId id; 

    //setter getter 
} 

嵌入類

@Embeddable 
public class FolderId implements java.io.Serializable { 

    private Integer folderId; 
    private Integer parentFolderId; 

    //setter getter 
} 

FolderObjectID實體

@Entity 
@Table(name = "FolderObjectID") 
public class FolderObjectID implements java.io.Serializable { 

    private folderObjectId id; 

    //setter getter 
} 

現在我想有是兩個實體一對一的關係使用FolderID文件夾表的列將鏈接到FolderObjectID表的FolderObjectID列。不幸的是，我收到錯誤，說我在文件夾實體上有一列壞了。

有人可以在這個問題上給我啓發。 謝謝。

Answer 1

你想使用@MapsId功能我猜。 這個類似，但我還沒有嘗試過：

文件夾實體

@Entity 
@Table(name = "Folder") 
public class Folder implements java.io.Serializable { 

    @EmbeddedId 
    private FolderId id; 

    @OneToOne 
    @MapsId("folderId") 
    private FolderObject folderObject; 
} 

FolderObjectID實體

@Entity @Table(name = "FolderObjectID") 
public class FolderObjectID implements java.io.Serializable { 

    @Id 
    private long folderObjectId; 

    @OneToOne(mappedBy = "folderObject") 
    @JoinColumn(name = "folderObjectId") 
    private Folder folder; 
}