Hibernate中的多对一映射

Question

下面的映射给出的错误为

从db.karateInvoiceDetail引用db.karateInvoice的外键的列数错误。应为1

@Id
@Column(name = "id")
private long                      id;
@OneToOne
@JoinColumn(name = "companyid")
@Id
private Company                   company;
@Id
private short                     fiscalYear;
@OneToMany(mappedBy = "karateInvoiceDetails")
private List<KarateInvoiceDetail> karateInvoiceDetails;

@Id
private short         seqNo;
@ManyToOne
@JoinColumns({ @JoinColumn(name = "karateInvoiceId"),
        @JoinColumn(name = "karateInvoiceCompanyId"),
        @JoinColumn(name = "karateInvoiceFiscalYear") })
private KarateInvoice invoice;
@Id
@OneToOne
@JoinColumns({ @JoinColumn(name = "studentId"),
        @JoinColumn(name = "studentCompanyId") })
private KarateStudent student;

@Id
private long        id;

想法是有一个invoice表，它的组合键为(id、fiscalyear和companyId)，而invoicedetail表的组合键为(seqNo、InvoiceId、InvoiceFiscalYear和InvoiceCompanyId)。

Answer 1

我认为您应该在@JoinColumn注释上显式引用发票列：

@ManyToOne
@JoinColumns({ @JoinColumn(name = "karateInvoiceId"
                  , referencedColumnName="id"),
        @JoinColumn(name = "karateInvoiceCompanyId"
               , referencedColumnName="companyId"),
        @JoinColumn(name = "karateInvoiceFiscalYear"
               , referencedColumnName="fiscalYear") })
private KarateInvoice invoice;