Question

首先，我有两个Entities Folder和FolderObjectID及其对应的表。

在文件夹表上我有复合键FolderID和ParentFolderID

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

在FolderObjectID表上，我将FolderObjectID作为主键。

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

文件夹实体

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

   private FolderId id;

   //setter getter
}

嵌入式课程

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

  private Integer folderId;
  private Integer parentFolderId;

  //setter getter
}

FolderObjectID实体

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

   private folderObjectId id;

   //setter getter
}

现在我想拥有的是两个实体上的一对一关系，使用Folder表的FolderID列链接FolderObjectID表的FolderObjectID列。不幸的是，我收到错误，说我的文件夹实体上的列已经坏了。

有人可以就此事启发我。感谢。

Answer 1

我想使用@MapsId功能。与此类似，但我还没有尝试过：

文件夹实体

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

   @EmbeddedId
   private FolderId id;

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

FolderObjectID实体

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

   @Id
   private long folderObjectId;

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

在复合键列上映射@OnetoOne

1 个答案: