Java 冬眠许多人加入

我对冬眠还不熟悉，我正在使用Spring。我有以下表格：

@Entity
@Configurable
public class Location {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long locationid;

    private String locationName;

    @ManyToOne
    private Site site;

//getters setters skipped
}

@Entity
@Configurable
public class Site {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long siteid;

    private String siteName;

    @ManyToOne
    private Country country;
    //getters setters skipped
    }

@Entity
@Configurable
public class Country {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long countryid;

    private String countryName;
    @ManyToOne
    private Region region;
    //getters setters skipped
}

@Entity
@Configurable
public class Region {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long regionid;

    private String regionName;
    //getters setters skipped
}

public class Assets {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long assetId;


    @ManyToOne
    private Location location;
    //getters setters skipped
}

我想根据地区提取所有资产。我该怎么做

如何使用区域->国家->站点->位置之间的关系，并提取相关记录？如何在不影响性能的情况下执行此操作

---

或者我应该重新设计表吗？

您可以通过类资产中的@NamedQuery来完成它： 从断言a中选择a，其中a.location.site.contry.regin.reginName=：reginName

希望能有所帮助