一对一弱实体映射JPA

问题描述：

我有一个实体类

@Entity
Class Search
{ 
   @Id
   private Long SearchID;
   private String Type;

}

和另一个实体类(SearchResults是一个弱实体，它依赖于搜索类为其主键

and another Entity Class ( SearchResults which is a weak Entity that depends on Search Class for its Primary Key

@Entity

Class SearchResults

{
   @???
   private Long SearchID;
}

在弱实体"SearchResults"中，应该使用什么注释来将搜索"实体类的搜索ID"分配为主键

What annotation should i use to assign "SearchID" of "Search" Entity class as my primary key in my weak Entity " SearchResults"

答

使用JPA共享主键的概念，可以按如下所示映射关系:

Using the JPA concept of Shared Primary Key, you can map your relationship as follows:

您的主要班级:

@Entity
public class Search { 
   @Id
   private Long searchID;
   private String type;
}

具有单个属性的派生标识符

@Entity
public class SearchResults {
    @Id
    @OneToOne
    @JoinColumn(name = "SEARCHID")       
    private Search search;
}

具有共享映射的发送者标识符

@Entity
public class SearchResults {
    @Id
    private Long searchID;

    @MapsId
    @OneToOne
    @JoinColumn(name = "SEARCHID")       
    private Search search;
}

此处全文: http ://vard-lokkur.blogspot.com.br/2014/05/onetoone-with-shared-primary-key.html

一对一弱实体映射JPA

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