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我需要一些帮助

我正在使用 gae、datastore 和 jdo

国家 1 - N 部门；部门 1 - N 个省，无主关系，作为在省的已知国家数据

实体派：

@PersistenceCapable(detachable = "true")
public class Pais implements Serializable{
    /**
     * 
     */
    private static final long serialVersionUID = -4204342672595368670L;
    @PrimaryKey
    @Persistent
    private String idPais;
    @Persistent
    private String codigo;
    @Persistent
    private String descripcion;
    @Persistent
    private Long version;
    @NotPersistent
    private String operacion;   
    @NotPersistent
    private String codePais;

实体部门：

@PersistenceCapable(detachable = "true")
public class Departamento implements Serializable{
    private static final long serialVersionUID = 2029238048901900816L;
    @PrimaryKey
    @Persistent
    private String idDepartamento;
    @Persistent
    private String codigo;
    @Persistent
    private String descripcion;
    @Persistent
    private Long version;
    @Persistent
    @Unowned
    private Pais beanPais;
    @Persistent
    private String codePais;
    @NotPersistent
    private String operacion;
    @NotPersistent
    private String codeDepartamento;

实体省

@PersistenceCapable(detachable = "true")
public class Provincia implements Serializable{
    /**
     * 
     */
    private static final long serialVersionUID = -2560617366920790922L;
    @PrimaryKey
    @Persistent
    private String idProvincia;
    @Persistent
    private String codigo;
    @Persistent
    private String descripcion;
    @Persistent
    private Long version;
    @NotPersistent
    private String operacion;
    @NotPersistent
    private String codeProvincia;
    @Persistent
    private String codeDepartamento;
    @Persistent
    @Unowned
    private Departamento beanDepartamento;
    @NotPersistent
    private String codePais;

允许我满足国家/地区数据的查询，访问地区 JDO

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