JavaHibernate:对于一个遥远的惰性依赖,有一个渴望的获取者吗?
假设我有:
-----------
| City |
-----------
| - id |
| - name |
-----------
(1)
|
|
|
(*)
-----------
| Street |
-----------
| - id |
| - name |
-----------
(1)
|
|
|
(*)
-----------
| House |
-----------
| - id |
| - num |
-----------
因此:
@Entity
public class City {
@Id
@GeneratedValue
private Long id;
private String name;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "street", cascade = CascadeType.ALL)
private List<Street> streets;
}
@Entity
public class Street {
@Id
@GeneratedValue
private Long id;
private String name;
@ManyToOne(fetch = FetchType.LAZY)
private City city;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "house", cascade = CascadeType.ALL)
private List<House> houses;
}
@Entity
public class House {
@Id
@GeneratedValue
private Long id;
private int num;
@ManyToOne(fetch = FetchType.LAZY)
private Street street;
}
问题是:我想在不获取城市的情况下获取房子的城市名称,并保留延迟加载。是否有一个神奇的装饰器来“急切地”加载远程依赖项?像
@Entity
public class House {
@Id
@GeneratedValue
private Long id;
private int num;
@ManyToOne(fetch = FetchType.LAZY)
private Street street;
@Magic(from this.street.city.name ?) // <------- HERE
private String houseName;
}
共 (0) 个答案