java - Hibernate映射子类忽略父类

Question

我想将许多子类映射到一个公共(public)父类:B扩展A，C扩展A，...但数据库不关心A。并且B和C没有任何共同点(没有Id，没有引用...)。

public class A {
    @Id
    @Column(name="id")
    private Long id;

    @Column(name="reference", nullable=false)
    private String reference;

}

是否可以在不添加@Entity的情况下做到这一点？

解决方案

@MappedSuperclass
public class A {
    @Id
    @Column(name="id")
    private Long id;

    @Column(name="reference", nullable=false)
    private String reference;

}

@Entity
@Table(name="B")
public class B extends A {
}

Answer 1

使用@MappedSuperclass在A类上:

Designates a class whose mapping information is applied to the entities that inherit from it. A mapped superclass has no separate table defined for it.