通過子文檔密鑰獲取，Spring Hibernate MongoDB應用程序

Question

我得到以下實體：

@Entity
@Document(collection = "devices")
public class Device {

    @Id
    private Long id;

    @ElementCollection
    @Column(name = "basic_info")
    private Map<String, String> basicInfo;

// getters, setters

以及以下存儲庫代碼：

@Repository
public interface DeviceRepository extends MongoRepository<Device, Long> {

    List<Device> findByBasicInfo_Name(String name);

文件看起來像這樣：

"id": 1,
"basicInfo": {
    "created": "timestamp",
    "name": "string",
    "type": "string",
    "status": "string"
}

我正在嘗試使用findByBasicInfo_Name函數檢索基於"basicInfo" "name"鍵的findByBasicInfo_Name ，甚至嘗試使用findByBasicInfoName在另一個線程中建議有人沒有運氣。 我收到以下錯誤：

Caused by: org.springframework.data.mapping.PropertyReferenceException: No property name found for type String! Traversed path: Device.basicInfo.

Answer 1

您需要創建一個自定義存儲庫並使用mongoTemplate實施。

@Repository
public interface DeviceRepository extends MongoRepository<Device, String>, DeviceRepositoryCustom {} 

創建一個自定義的repo接口，並聲明一個方法來findByMapKey

public interface DeviceRepositoryCustom {

  List<Device> findByMapKey(String mapKey,String value, Class clazz);
}

實施接口。

  public class DeviceRepositoryImpl implements  DeviceRepositoryCustom {

      @Autowired
      private final MongoTemplate mongoTemplate;

      @Override
      public List<Device> findByMapKey(String mapKey,String value, Class clazz) {

      Query query = Query.query(Criteria.where("basicInfo."+mapId).is(value));

       return mongoTemplate.find(query,clazz);
      }
    }