Interface between two related JPA entities
문제
The scenario is as below (tables shown)
Delivery table
------
id channelId type
10 100 fax
20 200 email
Fax table
----
id number
100 1234567
101 1234598
Email table
-----
id email
200 a@a.com
201 b@b.com
basically a one to one relationship between the delivery and the channel entity but since each concrete channel(fax, email) has different members I want to create a generic interface (channel) between the two entities and use it for the @OneToOne relationship. Seems to me a simple scenario where lot of you might have already gone through but I'm unable to succeed. I tried putting that targetEntity thing but no use. Still says "delivery references an unknown entity"
Any ideas? thanks in advance
해결책
What about using an abstract
super class for the Channel
and a TABLE_PER_CLASS
inheritance strategy? Something like this:
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class Channel {
@Id
@GeneratedValue
private Long id;
// ...
}
@Entity
public class Fax extends Channel {
}
@Entity
public class Email extends Channel {
}
@Entity
public class Delivery {
@Id
@GeneratedValue
private Long id;
@OneToOne
private Channel channel;
// ...
}
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