Hibernate 映射到扩展抽象的类

Question

I have a superclass for all my db objects.

@MappedSuperclass
public abstract class DBObject {
    @Id
    @GeneratedValue
    private Long id;
}

But sometimes i want to create a reference to another object by just using the superclass (ie FK through id)

@Entity
public class Person extends DBObject {

    private DBObject shirt;

}

This gives error: 'Basic' attribute type should not be 'Mapped Superclass'

Basically, the reason for this is, i can have tables for all different kinds of shirts and i would be able to assign whichever one of them to the person.

How do i tell hibernate that i dont want to use the DBObject class itself, but a class that extends DBObject

Answer 1

I think you might use following at abstract class:

@Entity @Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)