[英]How to fetch documents from subcollection in firestore using spring data
[英]How to read documents from elasticsearch using Spring Data?
我創建了一個索引(房屋),其類型為“公寓”,其中包含20個文檔。 我使用郵遞員將Json作為二進制文件上傳到elasticsearch中。 我有一個具有以下類的Spring Boot項目:
EsConfig.java-我已經配置了clustername,這是application.properties文件中的默認名稱。
@Configuration @EnableElasticsearchRepositories(basePackages = "com.search.repository") public class EsConfig { @Value("${elasticsearch.clustername}") private String EsClusterName; @Bean public Client esClient() throws UnknownHostException { Settings esSettings = Settings.builder() .put("cluster.name", EsClusterName) .put("client.transport.sniff", true) .put("client.transport.ignore_cluster_name", false) .build(); TransportClient client = new PreBuiltTransportClient(esSettings) .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300)); return client; } @Bean public ElasticsearchOperations elasticsearchTemplate() throws Exception{ return new ElasticsearchTemplate(esClient()); } }
Apartments.java-這是我的數據模型。 這些文件在elasticsearch中具有以下字段。
@Document(indexName = "house", type = "apartments") @JsonIgnoreProperties(ignoreUnknown=true) public class Apartments { @Id private String id; @JsonProperty("Apartment_Name") private String apartmentName; @JsonProperty("Apartment_ID") private String apartmentId; @JsonProperty("Area_Name") private String areaName; //constructors along with getters and setters }
ApartmentSearchRepository.java-這是擴展ElasticsearchRepository接口以執行原始操作的接口。
public interface ApartmentSearchRepository extends ElasticsearchRepository<Apartments, String> { List<Apartments> findByApartmentName(String apartmentName); }
EsApartmentService.java-
@Service public class EsApartmentService { @Autowired ApartmentSearchRepository apartmentSearchRepository; public List<Apartments> getApartmentByName(String apartmentName) { return apartmentSearchRepository.findByApartmentName(apartmentName); } }
ApartmentController.java-我創建了一個端點,該端點應從elasticsearch中退還那20個文檔。 (此外,Apartment是我的項目中的POJO,而Apartments是數據模型。)
@Autowired EsApartmentService esApartmentService; @GetMapping(path = "/search",produces = "application/json") public Set<Apartment> searchApartmentByName( @RequestParam(value = "apartmentName", defaultValue = "") String apartmentName) throws IOException { List<Apartment> apartments= new ArrayList<>(); esApartmentService.getApartmentByName(apartmentName).forEach(apartment-> { apartments.add(new Apartment(apartment.getApartmentName(), apartment.getApartmentId(), apartment.getAreaName())); }); return apartments.stream() .collect(Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(Apartment::getApartmentId)))); }
此代碼返回狀態200,但響應為空。 我嘗試調試,但似乎無法從elasticsearch讀取這些文檔。 我經歷了幾個解決方案,但是大多數解決方案都是從代碼本身內部設置文檔數據的。
我無法通過點擊控制器中指定的端點來檢索這些文檔。 有人可以讓我知道我可能會錯過的東西嗎? 謝謝! :)
據我所知,您可以使用@JsonProperty將POJO映射到查詢響應,但是您失去了使用彈簧數據的動態查找器方法(findBy *)的能力。 彈簧數據的動態查找器生成依賴於反射,並且POJO中的字段名稱在其中變得很重要。
您介意更改POJO或文檔中的字段名稱以進行驗證嗎? 或者只是定義一個自定義查詢? 還有一個功能強大的Java API,您可以在其中定義更復雜的查詢: https : //docs.spring.io/spring-data/elasticsearch/docs/current/reference/html/#elasticsearch.misc.filter
正如@ibexit上文所述,我刪除了@JsonProperty並在服務中使用了本機搜索查詢構建器。 另外,當我給apartment_Name時,它並沒有使用Apartment_Name並起作用。 (好像Elasticsearch遇到大小寫問題,所以我在Camel Case中給出了它。)
我的變更:
Apartments.java-刪除@JsonProperty
@Document(indexName = "house", type = "apartments") //@JsonIgnoreProperties(ignoreUnknown=true) public class Apartments { @Id private String id; //@JsonProperty("apartment_ID") private String apartment_ID; //@JsonProperty("Area_Name") private String area_Name; //@JsonProperty("Apartment_Name") private String apartment_Name; }
EsApartmentService.java-
@Service public class EsApartmentService { @Autowired private ElasticsearchTemplate elasticsearchTemplate; public List<Apartments> getApartmentByName(String apartmentName) { SearchQuery searchQuery = new NativeSearchQueryBuilder() .withQuery(org.elasticsearch.index.query.QueryBuilders .matchQuery("apartment_Name", apartmentName)).build(); Page<Apartments> sampleEntities = elasticsearchTemplate.queryForPage(searchQuery,Apartments.class); return sampleEntities.getContent(); } }
這些更改給了我所需的回復! :)
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