java - Hibernate 中的多对一映射

Question

以下映射给出的错误为

A Foreign key refering db.KarateInvoice from db.KarateInvoiceDetail has the wrong number of column. should be 1

发票实体:

@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;

发票详细信息:

@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;

公司实体:

@Id
private long        id;

想法是拥有一个Invoice表，其中包含(id、fiscalyear和companyId)和InvoiceDetail的组合，其组合键为(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;