使用弹簧数据映射和提取组合键的实体JPA

Question

我有Spring MVC和Data JPA。我正在试图做我有的映射表。结构如下图所示：

Device 
-------------- 
PK deviceId 
    deviceName 


Setting 
-------------- 
PK deviceId 
PK packageName 
PK name 
    value 

而且我对这些表类：

@Entity 
public class DeviceSetting implements Serializable { 
    @EmbeddedId 
    private String deviceId 
    private String deviceName; 

    @ManyToOne 
    @JoinColumn(name="deviceId", referencedColumnName="deviceId", insertable=false, updatable=false) 
    private Device device; 

    //Setters and Getters 
} 

@Embeddable 
public class DeviceSettingPk implements Serializable { 

    private String deviceId; 
    private String packageName; 
    private String name; 

    public DeviceSettingPk(){} 
    public DeviceSettingPk(String deviceId, String packageName, String name) { 
     super(); 
     this.deviceId = deviceId; 
     this.packageName = packageName; 
     this.name = name; 
    } 

     //Setters and Getters 
} 

@Entity 
public class Device implements Serializable { 

    private static final long serialVersionUID = 1L; 

    @NotEmpty 
    @Id 
    @Column(name="deviceId") 
    private String deviceId; 

     private String deviceName; 

     //Getters and Setters 
} 

但当我把设备我没有得到设备的数据和设定数据具有相同的设备ID，并通过使用查询DeviceSetting repository.findOne（DEVICEID）;

我还需要做什么来获取设备数据？任何意见将是有益的。谢谢。

Answer 1

更改映射如下。

@Entity 
public class DeviceSetting implements Serializable { 
    @EmbeddedId 
    private DeviceSettingPk deviceSettingId; 


    @ManyToOne 
    @JoinColumn(name="deviceId", referencedColumnName="deviceId", insertable=false, updatable=false) 
    private Device device; 

    //Setters and Getters 
} 

然后使用下面的代码进行查找。

DeviceSettingPk id = new DeviceSettingPk(deviceId, packageName, name); 

// use the deviceSettingRespository to lookup 
repository.findOne(id);