两个相关 JPA 实体之间的接口

发布于 2024-08-30 22:55:19 字数 653 浏览 5 评论 0原文

该场景如下（所示表格）

Delivery table
------
id  channelId   type
10  100         fax
20  200         email

Fax table
----
id   number
100  1234567
101  1234598

Email table
-----
id   email
200  [email protected]
201  [email protected]

基本上是交付和渠道实体之间的一对一关系，但由于每个具体渠道（传真、电子邮件）都有不同的成员，我想在两个实体之间创建一个通用接口（渠道），并且将其用于@OneToOne 关系。在我看来，这是一个简单的场景，你们中的很多人可能已经经历过，但我无法成功。我尝试放置 targetEntity 的东西但没有用。仍然说“交付引用未知实体”

有什么想法吗？提前致谢

原文

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  [email protected]
201  [email protected]

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

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生死何惧 2024-09-06 22:55:19

为 Channel 使用 abstract 超类和 TABLE_PER_CLASS 继承策略怎么样？像这样的事情：

@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;

    // ...
}

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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