我有以下结构：
@Entity
@Table(name = "Document")
@Inheritance(strategy = InheritanceType.JOINED)
@DiscriminatorColumn(name = "docType")
@DiscriminatorValue("DOC")
public class Document implements Serializable {
@Id
@Column(name = "id")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
….
}
@Entity @Inheritance @DiscriminatorValue("CONTRACT")
@Table(name = "Contract")
public class Contract extends Document {
}
现在我需要实现另一个具有类似结构的模块：
@Entity
@Table(name = "Transaction")
@Inheritance(strategy = InheritanceType.JOINED)
@DiscriminatorColumn(name = "transType")
@DiscriminatorValue("TR")
public class Transaction implements Serializable {
@Id
@Column(name = "id")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
….
}
@Entity @Inheritance @DiscriminatorValue("SPD")
@Table(name = "Spd")
public class SPD extends Transaction {
}
@Entity @Inheritance @DiscriminatorValue("TD")
@Table(name = "TD")
public class TD extends Transaction {
}
但是，突然间发现TD应该也是Document！从理论上讲，TD还应该扩展文档但是如何处理ID呢？不知道如何管理它们......
提前致谢