我正在使用Hibernate
将Entity1连接到Entity2,其中Entity2具有复合主键。
[Entity2
包含2列id
和type
public class Entity2 {
@EmbeddedId
private Entity2PK id;
}
@Embeddable
public class Entity2PK implements Serializable {
@Column(name = "id")
private String id;
@Column(name = "type")
private String type;
}
[Entity1
包含2列id
和entity_2_id
(对Entity2
的外键引用]]
public class Entity1 {
@Id
@Column(name = "id", updatable = false, nullable = false)
private String id;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name="entity_2_id")
private Entity2 entity2;
}
因此,所有通话均失败。有人对此有解决方案吗?
错误信息:
org.hibernate.AnnotationException: A Foreign key refering Entity2 from Entity1 has the wrong number of column. should be 4
at org.hibernate.cfg.annotations.TableBinder.bindFk(TableBinder.java:646)
at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPass.java:102)
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processEndOfQueue(InFlightMetadataCollectorImpl.java:1814)
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processFkSecondPassesInOrder(InFlightMetadataCollectorImpl.java:1758)
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1646)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:286)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(MetadataBuildingProcess.java:83)
at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:473)
at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:84)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:689)
您似乎与此用户有相同的问题:AnnotationException: A Foreign key refering has the wrong number of column. should be 2
Entity1无法将关系存储在单个列中,因为Entity2的ID具有2列。您可以使用JoinColumns
而不是JoinColumn
解决此问题。
@JoinColumns({
@JoinColumn(name = "id", insertable = false, updatable = false),
@JoinColumn(name = "type", insertable = false, updatable = false)
})