java - 一对一弱实体映射 JPA

Question

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，它是一个弱实体，其主键依赖于搜索类

@Entity

Class SearchResults

{
   @???
   private Long SearchID;
}

我应该使用什么注释将“搜索”实体类的“SearchID”分配为弱实体“SearchResults”中的主键

Answer 1

使用共享主键的 JPA 概念，您可以按如下方式映射您的关系:

您的主类(class):

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

具有单一属性的派生标识符

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

具有共享映射的派生标识符

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

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

完整文章在这里:http://vard-lokkur.blogspot.com.br/2014/05/onetoone-with-shared-primary-key.html