You can create a composite id class that only have the ContentHeader:
@Embeddable
public class ContentKey implements java.io.Serializable {
@ManyToOne(cascade = {}, fetch = FetchType.LAZY)
@JoinColumn(name = "ID", updatable = true)
private ContentHeader header;
// ...
}
@Entity
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
public abstract class Content {
@Id
public ContentKey getContentKeyId()
// ...
}
这应该够了吧。
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