Question

我一直在尝试使用地理空间查询将数据提取到pojo中但没有成功。

以下是我的monogdb集合中的示例数据

{
    "_id" : ObjectId("597b8c9a21871eeabd5a1cf5"),
    "amb_id" : 10,
    "amb_number" : "KL25 8945",
    "driver_name" : "Amal Shaji",
    "driver_licence_id" : "12/4562/2017",
    "ownership" : "Amrita Institute of Medical Science",
    "ownership_address" : "Peeliyadu Road, Ponekkara, Edappally, Ernakulam",
    "location" : {
        "type" : "Point",
        "coordinates" : [
            76.293485,
            10.032871
        ]
    }
}

下面的mongo查询在mongoshell

中运行得非常好

 db.trial.find( 
  { location : 
  { $near :{ 
    $geometry :{  
      type : "Point" ,  
      coordinates : [ 76.2 , 9.9 ] } ,
      $maxDistance : 20000            }
      } 

  } 
  )
  .pretty();

这是我一直试图将数据提取到

中的pojo

@Document(collection = "trial")
    public class Ambulance {
        @Id
        String id;
        @Field("amb_id")
        String ambulanceId;
        @Field("amb_number")
        String licensePlateNumber;
        @Field("driver_name")
        String driverName;
        @Field("driver_licence_id")
        String driverLicenseNumber;
        @Field("ownership")
        String ownerShip;
        @Field("ownership_address")
        String ownerShipAddress;
        @GeoSpatialIndexed(name="Location")
        Double[] location;

        //setters and getters
   }

这是我一直在使用的存储库

@ComponentScan
@Repository
public interface AmbulanceRepo extends MongoRepository<Ambulance, String> {
  GeoResults<Ambulance> findByLocationNear(Point p, Distance d);
}

和控制器

@RestController
@CrossOrigin(origins = "http://localhost:4200")
@RequestMapping("/")
public class NearbyAmbulanceController {

    private AmbulanceRepo ambulanceRepo;

    @Autowired
    public NearbyAmbulanceController(AmbulanceRepo repo){
        this.ambulanceRepo = repo;
    }

    @RequestMapping(value="/nearbyAmbulance",method = RequestMethod.POST)
    @ResponseBody
    public GeoResults<Ambulance> getAmbulanceDetails(
            @RequestBody LocationRequest locationRequest){
        System.out.println("lati "+locationRequest.getLatitude()+ " long "+locationRequest.getLongitude()+" d "+locationRequest.getDistance());
//        List<Ambulance> ambulanceList=this.ambulanceRepo.findByLocationNear(new Point(Double.valueOf(locationRequest.getLongitude()),Double.valueOf(locationRequest.getLatitude())),new Distance(locationRequest.getDistance(), Metrics.KILOMETERS));
        Point point = new Point(locationRequest.getLatitude(), locationRequest.getLongitude());
        Distance distance = new Distance(locationRequest.getDistance(), Metrics.KILOMETERS);
        GeoResults<Ambulance> ambulanceList=this.ambulanceRepo.findByLocationNear(point,distance);
        System.out.println(ambulanceList);
        return ambulanceList;
    }
}

每次尝试时都没有结果。我确信我在给定的点和附近的位置有数据，我甚至可以使用mongoshell来获取它们。我觉得问题在于我在实体中注释了位置字段的方式。有什么我想念的吗？任何帮助都是有用的。

Answer 1

似乎mongodb中有多个数据库，其名称为'trial'。我尝试删除所有这些，现在它工作正常。 Spring数据无法确定要查询的集合，因为在不同的数据库中存在多个具有相同名称的集合。希望这对某人有所帮助，因为我已经浪费了几天时间。

Answer 2

Spring MongoDb地理空间查询：经过了很好的测试。

   public List<MachineDetails> searchbylocation(String lat, String longt, String maxDistance) {
            BasicQuery query1 = new BasicQuery("{geoLocation:{ $near: { $geometry: { type: 'Point',coordinates: ["+ lat+","+ longt+" ] }, $minDistance: 10, $maxDistance: "+maxDistance+"}}}");

            List<MachineDetails> venues1 = mtemplate.find(query1, MachineDetails.class);

return venues1;
}

spring data mongo地理空间查询

2 个答案: