具有多个@Id的Hibernate映射异常
我有两个实体,它们之间有关系。 这是我的第一个实体:具有多个@Id的Hibernate映射异常,hibernate,annotations,Hibernate,Annotations,我有两个实体,它们之间有关系。 这是我的第一个实体: @Entity @Table(name = "APPLICATION_DEVICE") public class ApplicationDevice implements Serializable { [...] @Id @ManyToOne @JoinColumn(name = "udid", nullable=false) public Device
@Entity
@Table(name = "APPLICATION_DEVICE")
public class ApplicationDevice implements Serializable {
[...]
@Id
@ManyToOne
@JoinColumn(name = "udid", nullable=false)
public Device getDevice()
{
return device;
}
public void setDevice(Device device)
{
this.device = device;
}
@Id
public Long getApplicationId()
{
return applicationId;
}
public void setApplicationId(Long applicationId)
{
this.applicationId = applicationId;
}
[...]
注意,它有一个带两个字段的primery键:applicationId和一个device(作为另一个关系)
我的另一个实体是:
@Entity
@Table(name = "SEGMENT_APPLICATION_DEVICES")
public class SegmentApplicationDevice
{
[...]
@Id
@GeneratedValue
public Long getId()
{
return id;
}
public void setId(Long id)
{
this.id = id;
}
@ManyToOne
public ApplicationDevice getApplicationDevice()
{
return applicationDevice;
}
public void setApplicationDevice(ApplicationDevice applicationDevice)
{
this.applicationDevice = applicationDevice;
}
[...]
下面是hibernate在尝试映射这些实体时的一个例外:
Exception constructing service 'HibernateSessionSource': Error invoking service builder method org.apache.tapestry5.hibernate.HibernateCoreModule.buildHibernateSessionSource(Logger, List, RegistryShutdownHub) (at HibernateCoreModule.java:123) (for service 'HibernateSessionSource'): Foreign key (FK5B8CB9821C11FEAE:SEGMENT_APPLICATION_DEVICES [applicationDevice_applicationId])) must have same number of columns as the referenced primary key (APPLICATION_DEVICE [udid,applicationId])
我做错了什么?谢谢 ApplicationDevice有一个由2列组成的复合id。但是,ApplicationDevice的manyTone没有指定列(应该有2个),因此使用了默认的一个带有“entityname\u id”的列 为了缓解这种情况,请在多个列中指定两个列,这两个列是ApplicationDevice的joincolumns