我正在创建一个使用一些空间查询的项目。 我使用带有 spring 数据存储库的 Spring boot 和带有 PostGIS 扩展的 PostgreSQL 作为数据库。
我创建了这个存储库:
import com.vividsolutions.jts.geom.Geometry;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
@Repository
public interface AreaRepository extends CrudRepository<Area, Long> {
/*
extra queries for Area here
*/
@Query(value="select st_intersection(" +
":base_layer ," +
":filter_layer" +
")", nativeQuery = true)
Geometry geometryIntersectGeometry(@Param("base_layer") Geometry baseGeometry,@Param("filter_layer") Geometry filterGeometry);
}
它包含对 Area 实体的一些查询。我还想使用一些 PostGIS 函数进行一些计算,所以我创建了 geometryIntersectGeometry 来从 PostGis 调用 st_intersection 函数,这应该返回一个几何图形。
我在设置中将休眠方言设置为 PostGIS:
spring.datasource.driverClassName=org.postgresql.Driver
spring.datasource.url=jdbc:postgresql://localhost:5432/test_db
spring.datasource.username=postgres
spring.datasource.password=postgres
spring.jpa.properties.hibernate.dialect = org.hibernate.spatial.dialect.postgis.PostgisDialect
我有 hibernate spatial 的依赖项:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-spatial</artifactId>
<version>${hibernate.version}</version>
</dependency>
...
调用 geometryIntersectGeometry 函数导致错误:
No Dialect mapping for JDBC type: 1111; nested exception is org.hibernate.MappingException: No Dialect mapping for JDBC type: 1111,{}
如何告诉 JPA/Spring Data 将几何(PostGIS 类型)响应映射到 Geometry(com.vividsolutions.jts.geom.Geometry) 对象?
最佳答案
设法通过编写 custom implementation 来修复它存储库并注册类型(thx Simon Martinelli)
存储库:
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
@Repository
public interface AreaRepository extends CrudRepository<Area, Long>, AreaGisRepository {
/*
extra queries for Area here
*/
}
界面:
import com.vividsolutions.jts.geom.Geometry;
public interface AreaGisRepository {
Geometry geometryIntersectGeometry(Geometry baseGeometry, Geometry filterGeometry);
}
和实现:
import com.vividsolutions.jts.geom.Geometry;
import org.hibernate.spatial.JTSGeometryType;
import org.hibernate.spatial.dialect.postgis.PGGeometryTypeDescriptor;
import org.springframework.beans.factory.annotation.Autowired;
import javax.persistence.EntityManager;
public class AreaGisRepositoryImpl implements AreaGisRepository {
private EntityManager entityManager;
@Autowired
public AreaGisRepositoryImpl(EntityManager entityManager) {
this.entityManager = entityManager;
}
@Override
public Geometry geometryIntersectGeometry(Geometry baseGeometry, Geometry filterGeometry) {
return (Geometry) entityManager
.createNativeQuery(
"select st_intersection(:base_layer , :filter_layer) as geom")
.setParameter("base_layer", baseGeometry)
.setParameter("filter_layer", filterGeometry)
.unwrap(org.hibernate.query.NativeQuery.class)
.addScalar("geom", new JTSGeometryType(PGGeometryTypeDescriptor.INSTANCE))
.getSingleResult();
}
}
它工作完美,但我现在对 Postgis 有一个硬编码依赖(我们不太可能使用其他东西,但是......)
关于spring-boot - 具有 Geometry 返回类型的 Spring Data 存储库和 native 查询,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52330613/