Spring Data JPA的极度简便的使用方式让我们爱不释手，但是我们在项目中经常会有使用空间数据的场景，而不同的数据库对空间数据实现的方式不同，而这些不仅是JPA或者Spring Data JPA都是不支持的这时我们需要引入hibernate-spatial来去除数据库支持的异构性。在本例中集成了Spring Data JPA、hibernate -spatial、PostGIS一起的使用方式。
1. 添加依赖
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-spatial</artifactId>
<version>5.2.10.Final</version>
</dependency>
2. 数据库方言指定
spring.jpa.database-platform: org.hibernate.spatial.dialect.postgis.PostgisPG9Dialect
org.hibernate.spatial.dialect下还有h2,mysql,oracle,sqlserver的方言。
3. 属性映射
@Column(columnDefinition = "geometry(Point,4326)")
private Point point;
4. 定义Spring Data Repository
public interface CityRepository extends JpaRepository<City,Long> {
@Query("select city from City as city where equals(city.point,:point) = TRUE")
List<City> findByPoint(@Param("point") Point point);
}
5. 保存测试
@Bean
CommandLineRunner geometrySave(CityRepository cityRepository){
return e ->{
City city = new City();
city.setName("合肥");
Geometry point = wktReader().read("POINT (117.2 31.8)");
Point pointToSave = point.getInteriorPoint();
pointToSave.setSRID(4326);
city.setPoint(pointToSave);
cityRepository.save(city);
};
}
6. 读取测试
@Bean
CommandLineRunner geometryRead(CityRepository cityRepository){
return e -> {
City city = cityRepository.findOne(3l);
Point point = city.getPoint();
log.info("经度:" + point.getX() + " 维度:" + point.getY() + " 坐标系统:" + point.getSRID());
};
}
7. 查询测试
@Bean
CommandLineRunner geometryQuery(CityRepository cityRepository){
return e -> {
Geometry point = wktReader().read("POINT (117.2 31.8)");
Point pointToQuery = point.getInteriorPoint();
pointToQuery.setSRID(4326);
List<City> cities = cityRepository.findByPoint(pointToQuery);
for (City city : cities) {
log.info("查询结果为:" + city.getId() + "/" +city.getName() + "/" +city.getPoint());
}
};
}
我们在cityRepository中使用了hibernate-spatial中的空间函数equals，具体空间函数列表请查看http://docs.jboss.org/hibernate/orm/5.2/userguide/html_single/Hibernate_User_Guide.html#spatial-configuration-dialect
8 源码地址
http://www.wisely.top/2017/06/26/hibernate-spatial-spring-data-jpa/
