我有一个具有休眠搜索@Spatial数据的实体A,如下所示:
@Entity
@Spatial(spatialMode = SpatialMode.HASH)
@Indexed
public class A {
@Id
@GeneratedValue(generator = "uuid2")
private UUID id;
private Double latitude;
private Double longitude;
@Spatial(spatialMode = SpatialMode.HASH)
@SortableField
public Coordinates getLocation() {
return new Coordinates() {
@Override
public Double getLatitude() {
return latitude;
}
@Override
public Double getLongitude() {
return longitude;
}
};
}
@ManyToMany(fetch = FetchType.EAGER)
@IndexedEmbedded
private Set<B> multipleB = new HashSet<>();
}
实体A与实体B具有ManyToMany关系。 实体A具有对实体B重要的空间信息。现在,我要对实体B执行空间查询,该查询使用实体A的位置信息。
@Entity
@Indexed
public class B {
@Id
@GeneratedValue(generator = "uuid2")
private UUID id;
@ManyToMany
@ContainedIn
private Set<A> multipleA = new HashSet<>();
}
我试图像这样对实体B进行查询:
QueryBuilder qb = fullTextEntityManager.getSearchFactory().buildQueryBuilder().forEntity(B.class).get();
Query luceneQuery = qb.
spatial()
.onField("multipleA.location")
.within(kmRadius, Unit.KM)
.ofLatitude(centerLatitude)
.andLongitude(centerLongitude)
.createQuery();
但是问题是,当我这样查询时,出现以下异常:
The field 'B#multipleA.location' used for the spatial query is not configured as spatial field. Check the proper use of @Spatial respectively SpatialFieldBridge.
是否有一种方法可以对类型B的实体进行空间查询,该查询使用@ManyToMany连接的实体A中的空间数据?
对于我的查询,如果为每个连接的实体A多次返回相同的实体B(如使用联接一样),也是可以接受的。
示例(a_1是最接近的实体A)
Database: b_1 -> (a_1, a_2), b_2 -> (a_1), b_3 -> (a_2, a_3)
查询结果:
b_1 (a_1 is the closest)
b_2 (a_1)
b_1 (a_2 is the second closest)
b_3 (a_2)
b_3 (a_3)
答案 0 :(得分:1)
Hibernate Search不支持多值位置;即使您设法为其编制索引,查询也无法正常工作(它将混合来自不同点的纬度和经度)。
我看到此工作的唯一方法是让您将多对多关联建模为一个实体,对该实体建立索引,然后查询它而不是B
。
另外,请注意,您收到的错误与另一个问题有关:您定位的字段不存在。如果您希望它存在,则需要在@IndexedEmbedded
上添加一个B#multipleA
。
这里应该可以更好地工作:
@Entity
@Spatial(spatialMode = SpatialMode.HASH)
@Indexed
public class A {
@Id
@GeneratedValue(generator = "uuid2")
private UUID id;
private Double latitude;
private Double longitude;
@Latitude
public Double getLatitude() {
return latitude;
}
@Longitude
public Double getLongitude() {
return longitude;
}
@OneToMany(mappedBy = "a")
@ContainedIn
private Set<AToB> multipleB = new HashSet<>();
}
@Entity
@Indexed
public class AToB {
@Id
@GeneratedValue(generator = "uuid2")
private UUID id;
@ManyToOne
@IndexedEmbedded(includePaths = "location") // includePaths will be necessary to avoid infinite recursion if you really want an @IndexedEmbedded from A to B
private A a;
@ManyToOne
@IndexedEmbedded
private B b;
}
@Entity
public class B {
@Id
@GeneratedValue(generator = "uuid2")
private UUID id;
@OneToMany(mappedBy = "b")
@ContainedIn
private Set<AToB> multipleA = new HashSet<>();
}
然后,像这样的查询:
QueryBuilder qb = fullTextEntityManager.getSearchFactory().buildQueryBuilder().forEntity(AToB.class).get();
Query luceneQuery = qb.
spatial()
.onField("a.location")
.within(kmRadius, Unit.KM)
.ofLatitude(centerLatitude)
.andLongitude(centerLongitude)
.createQuery();