jpa 多对多，带有附加列和复合键

Posted 2023-04-12

【中文标题】jpa 多对多，带有附加列和复合键

【英文标题】：jpa many to many with additional column and composite key

【发布时间】：2016-09-08 17:04:08

【问题描述】：

我有 2 个表：文件夹（简单主键）和文档（复合主键） 我想要一个名为 folder_documents 的连接表，它将包含两个表的 id 以及其他列

有我的实体：

文件夹

@Entity
@Table(name = "folder")

public class Folder 

    @Id
    @SequenceGenerator(name = "folder_seq_gen", sequenceName = "FOLDER_SEQ", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "folder_seq_gen")
    private long id;

    @Column
    private Date date;

    @OneToMany(mappedBy = "folder_documents_compositeKey.folder",
            cascade = CascadeType.ALL)
    private Set<Folder_Documents> folder_documents;

文档

@Entity
@Table(name="document")
public class Document 

    @EmbeddedId 
    private DocumentID documentCompositeKey;

    @Column
    private Date date;

DocumentID（复合键）

@Embeddable
public class DocumentID implements Serializable 
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private String id;
    private String matricule;

Folder_Document（连接表）

@Entity
@Table(name = "folder_documents")
@AssociationOverrides(
    @AssociationOverride(name = "folder_documents_compositeKey.folder",
        joinColumns = @JoinColumn(name = "folder_id")),
    @AssociationOverride(name = "folder_documents_compositeKey.document",
        joinColumns = @JoinColumn(name = "doc_id" , referencedColumnName = "id")), // error mapping there
    @AssociationOverride(name = "folder_documents_compositeKey.document",
        joinColumns = @JoinColumn(name = "matricule" , referencedColumnName = "matricule")))// error mapping there
public class Folder_Documents 

    @EmbeddedId
    private Folder_Documents_ID folder_documents_compositeKey  = new Folder_Documents_ID();

    @Column
    private Date date;

    @Column
    private String status;

Folder_documents_id（复合键）

@Embeddable
public class Folder_Documents_ID implements Serializable  

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    @ManyToOne(cascade = CascadeType.ALL)
    private Folder folder;
    @ManyToOne(cascade = CascadeType.ALL)
    private Document document;

问题是我无法在 Folder_Documents 的 @AssociationOverrides 属性中映射 Document 复合键，因为休眠在 Document 中找不到复合键 id 和矩阵属性。文件夹引用很好。

有堆栈跟踪：

Caused by: org.hibernate.AnnotationException: referencedColumnNames(matricule) of com.renault.entity.Folder_Documents_ID.folder_documents_compositeKey.document referencing com.renault.entity.Document not mapped to a single property

【参考方案1】：

已解决，AssociationOverride 注解语法错误

正确的语法：

AssociationOverrides(
    @AssociationOverride(name = "folder_documents_compositeKey.folder", joinColumns = @JoinColumn(name = "folder_id")),
    @AssociationOverride(name = "folder_documents_compositeKey.document",  joinColumns =  
            @JoinColumn(name = "doc_id" , referencedColumnName = "id") ,
            @JoinColumn(name = "matricule" , referencedColumnName = "matricule") ))