jpa一对多复合主键映射

Question

我有 2 个 table 如下：

TABLE_A
-------
A_SIREN
A_NDA

TABLE_B
-------
B_id    
B_NDA
B_SIREN

tableA的id是COMPOSITE KEYSIREN/NDA

这是实体代码。

键class

@Embeddable
public class SirenNdaKey implements Serializable {
  @Column(name = "A_SIREN")        
  protected String siren;
  @Column(name = "A_NDA")        
  protected String nda;
  // getters setters
}

TABLE一个

public class EntityA{

   @EmbeddedId  
   private SirenNdaKey sirenNda;

   @OneToMany(fetch = FetchType.LAZY)
      @PrimaryKeyJoinColumns({ @PrimaryKeyJoinColumn(name = "A_SIREN", 
    referencedColumnName = "B_SIREN"),
      @PrimaryKeyJoinColumn(name = "A_NDA", referencedColumnName = "B_NDA") 
    })
   private Set<EntityB> EntityBSet;
   ...
}

TABLE B

public class EntityB
    @Id
    private long id;
    @Column(name = "B_SIREN")
    private String siren;    
    @Column(name = "B_NDA")
    private String nda;
}

Hibernate 生成 3 tables：TABLE_A、TABLE_B 和包含 A_NDA、A_SIREN、[=39 的关联 table =].我该怎么做才能只生成 2 tables.

我的目标是从实体 A (entityA.getEntityBSet()) 中找到与同一对 SIREN/NDA 关联的实体 B 的列表，而不需要关联 table，因为我的 tables 由外部批次提供。

entityA = entityARepository.findOne(new SirenNdaKey("nda_test1", "siren_test1"));
entityA.getEntityBSet()  // this list is always empty

Answer 1

这是正确的源代码，我应该使用 @JoinColumns 而不是 @PrimaryKeyJoinColumns

public class EntityA{

   @EmbeddedId  
   private SirenNdaKey sirenNda;

   @OneToMany(fetch = FetchType.LAZY)
      @JoinColumns({ @JoinColumn(name = "B_SIREN", 
    referencedColumnName = "A_SIREN"),
      @JoinColumn(name = "B_NDA", referencedColumnName = "A_NDA") 
    })
   private Set<EntityB> EntityBSet;
   ...
}

jpa一对多复合主键映射

jpa one to many composite primary key mapping

java

hibernate

jpa

composite-key

one-to-many