利用?SpringBoot?在?ES?中實(shí)現(xiàn)類似連表查詢功能
更新時(shí)間：2022年07月12日 15:16:38 作者：鴨血粉絲Tang
這篇文章主要介紹了如何利用?SpringBoot?在?ES?中實(shí)現(xiàn)類似連表的查詢功能,本文通過示例代碼給大家介紹的非常詳細(xì)，對大家的學(xué)習(xí)或工作具有一定的參考借鑒價(jià)值，需要的朋友可以參考下
一、摘要
在上篇文章中，我們詳細(xì)的介紹了如何在 ES 中精準(zhǔn)的實(shí)現(xiàn)嵌套json對象查詢？
那么問題來了，我們?nèi)绾卧诤蠖送ㄟ^技術(shù)方式快速的實(shí)現(xiàn) es 中內(nèi)嵌對象的數(shù)據(jù)查詢呢？
為了方便更容易掌握技術(shù)，本文主要以上篇文章中介紹的通過商品找訂單為案例，利用 SpringBoot 整合 ES 實(shí)現(xiàn)這個(gè)業(yè)務(wù)需求，向大家介紹具體的技術(shù)實(shí)踐方案，存入es中的json數(shù)據(jù)結(jié)構(gòu)如下：
{
"orderId":"1",
"orderNo":"123456",
"orderUserName":"張三",
"orderItems":[
{
"orderItemId":"12234",
"orderId":"1",
"productName":"火腿腸",
"brandName":"雙匯",
"sellPrice":"28"
},
{
"orderItemId":"12235",
"orderId":"1",
"productName":"果凍",
"brandName":"匯源",
"sellPrice":"12"
}
]
}廢話也不多說了，直接上代碼！
二、項(xiàng)目實(shí)踐
2.1添加依賴
在SpringBoot項(xiàng)目中，添加rest-high-level-client客戶端，方便與 ES 服務(wù)器連接通信，在這里需要注意一下，推薦客戶端的版本與 ES 服務(wù)器的版本號一致，不然會出現(xiàn)接口請求錯(cuò)誤等異常！
小編本次安裝的ES服務(wù)端版本號為6.8.2，因此客戶端也保持6.8.2，與之一致！
<!--elasticsearch-->
<dependency>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>6.8.2</version>
</dependency>
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-client</artifactId>
<version>6.8.2</version>
</dependency>
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>6.8.2</version>
</dependency>2.2配置 es 客戶端
為了更佳方便的使用 es，我們可以將其各個(gè)配置類進(jìn)行封裝，方便后續(xù)進(jìn)行維護(hù)。
- 在application.properties配置文件中，定義 es 配置連接地址；
# 設(shè)置es參數(shù) elasticsearch.scheme=http elasticsearch.address=127.0.0.1:9200 elasticsearch.userName= elasticsearch.userPwd= elasticsearch.socketTimeout=5000 elasticsearch.connectTimeout=5000 elasticsearch.connectionRequestTimeout=5000
- 創(chuàng)建ElasticSearch配置類，方便SpringBoot啟動(dòng)時(shí)注入；
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.Arrays;
import java.util.Objects;
@Configuration
public class ElasticSearchConfiguration {
private static final Logger log = LoggerFactory.getLogger(ElasticSearchConfiguration.class);
private static final int ADDRESS_LENGTH = 2;
@Value("${elasticsearch.scheme:http}")
private String scheme;
@Value("${elasticsearch.address}")
private String address;
@Value("${elasticsearch.userName}")
private String userName;
@Value("${elasticsearch.userPwd}")
private String userPwd;
@Value("${elasticsearch.socketTimeout:5000}")
private Integer socketTimeout;
@Value("${elasticsearch.connectTimeout:5000}")
private Integer connectTimeout;
@Value("${elasticsearch.connectionRequestTimeout:5000}")
private Integer connectionRequestTimeout;
/**
* 初始化客戶端
* @return
*/
@Bean(name = "restHighLevelClient")
public RestHighLevelClient restClientBuilder() {
HttpHost[] hosts = Arrays.stream(address.split(","))
.map(this::buildHttpHost)
.filter(Objects::nonNull)
.toArray(HttpHost[]::new);
RestClientBuilder restClientBuilder = RestClient.builder(hosts);
// 異步參數(shù)配置
restClientBuilder.setHttpClientConfigCallback(httpClientBuilder -> {
httpClientBuilder.setDefaultCredentialsProvider(buildCredentialsProvider());
return httpClientBuilder;
});
// 異步連接延時(shí)配置
restClientBuilder.setRequestConfigCallback(requestConfigBuilder -> {
requestConfigBuilder.setConnectionRequestTimeout(connectionRequestTimeout);
requestConfigBuilder.setSocketTimeout(socketTimeout);
requestConfigBuilder.setConnectTimeout(connectTimeout);
return requestConfigBuilder;
});
return new RestHighLevelClient(restClientBuilder);
}
/**
* 根據(jù)配置創(chuàng)建HttpHost
* @param s
* @return
*/
private HttpHost buildHttpHost(String s) {
String[] address = s.split(":");
if (address.length == ADDRESS_LENGTH) {
String ip = address[0];
int port = Integer.parseInt(address[1]);
return new HttpHost(ip, port, scheme);
} else {
return null;
}
}
/**
* 構(gòu)建認(rèn)證服務(wù)
* @return
*/
private CredentialsProvider buildCredentialsProvider(){
final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(userName,
userPwd));
return credentialsProvider;
}
}- 封裝ElasticSearch客戶端服務(wù)類，方便公共調(diào)用處理
import com.fasterxml.jackson.databind.ObjectMapper;
import org.example.es.exception.CommonException;
import org.apache.commons.lang3.StringUtils;
import org.elasticsearch.action.admin.indices.alias.get.GetAliasesRequest;
import org.elasticsearch.action.admin.indices.create.CreateIndexRequest;
import org.elasticsearch.action.admin.indices.create.CreateIndexResponse;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.action.admin.indices.get.GetIndexRequest;
import org.elasticsearch.action.admin.indices.get.GetIndexResponse;
import org.elasticsearch.action.admin.indices.mapping.get.GetMappingsRequest;
import org.elasticsearch.action.admin.indices.mapping.get.GetMappingsResponse;
import org.elasticsearch.action.admin.indices.mapping.put.PutMappingRequest;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.support.master.AcknowledgedResponse;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.GetAliasesResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.io.IOException;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
@Component
public class ElasticSearchClient {
private static final Logger log = LoggerFactory.getLogger(ElasticSearchClient.class);
private static final ObjectMapper objectMapper = new ObjectMapper();
@Autowired
private RestHighLevelClient client;
/**
* 查詢?nèi)克饕?
* @return
*/
public Set<String> getAlias(){
try {
GetAliasesRequest request = new GetAliasesRequest();
GetAliasesResponse response = client.indices().getAlias(request, RequestOptions.DEFAULT);
return response.getAliases().keySet();
} catch (IOException e) {
log.error("向es發(fā)起查詢?nèi)克饕畔⒄埱笫?, e);
}
return Collections.emptySet();
}
/**
* 檢查索引是否存在
* @param indexName
* @return
*/
public boolean existsIndex(String indexName){
try {
// 創(chuàng)建請求
GetIndexRequest request = new GetIndexRequest().indices(indexName);
// 執(zhí)行請求,獲取響應(yīng)
boolean response = client.indices().exists(request, RequestOptions.DEFAULT);
return response;
} catch (Exception e) {
log.error("向es發(fā)起查詢索引是否存在請求失敗，請求參數(shù)：" + indexName, e);
}
return false;
}
/**
* 查詢索引
* @param indexName
* @return
*/
public String getIndex(String indexName){
try {
// 創(chuàng)建請求
GetIndexRequest request = new GetIndexRequest().indices(indexName);
// 執(zhí)行請求,獲取響應(yīng)
GetIndexResponse response = client.indices().get(request, RequestOptions.DEFAULT);
return response.toString();
} catch (Exception e) {
log.error("向es發(fā)起查詢索引請求失敗，請求參數(shù)：" + indexName, e);
}
return StringUtils.EMPTY;
}
/**
* 創(chuàng)建索引
* @param indexName
* @param mapping
* @return
*/
public void createIndex(String indexName, Map<String, Object> mapping){
try {
CreateIndexRequest request = new CreateIndexRequest();
//索引名稱
request.index(indexName);
//索引配置
Settings settings = Settings.builder()
.put("index.number_of_shards", 3)
.put("index.number_of_replicas", 1)
.put("index.max_inner_result_window", 5000)
.build();
request.settings(settings);
//索引結(jié)構(gòu)
request.mapping("_doc",mapping);
//執(zhí)行請求,獲取響應(yīng)
CreateIndexResponse response = client.indices().create(request, RequestOptions.DEFAULT);
if(!response.isAcknowledged()){
throw new CommonException("向es發(fā)起創(chuàng)建索引請求失敗");
}
log.info("向es發(fā)起創(chuàng)建索引請求成功，返回參數(shù)：{}", response.index());
} catch (Exception e) {
log.error("向es發(fā)起創(chuàng)建索引請求失敗，請求參數(shù)：" + indexName, e);
throw new CommonException("向es發(fā)起創(chuàng)建索引請求失敗");
}
}
/**
* 刪除索引
* @param indexName
* @return
*/
public void deleteIndex(String indexName){
try {
DeleteIndexRequest request = new DeleteIndexRequest(indexName);
AcknowledgedResponse response = client.indices().delete(request, RequestOptions.DEFAULT);
if(!response.isAcknowledged()){
throw new CommonException("向es發(fā)起刪除索引請求失敗");
}
log.info("向es發(fā)起刪除索引請求成功，請求參數(shù)：{}", indexName);
} catch (Exception e) {
log.error("向es發(fā)起刪除索引請求失敗，請求參數(shù)：" + indexName, e);
throw new CommonException("向es發(fā)起刪除索引請求失敗");
}
}
/**
* 查詢索引映射字段
* @param indexName
* @return
*/
public String getMapping(String indexName){
try {
GetMappingsRequest request = new GetMappingsRequest().indices(indexName).types("_doc");
GetMappingsResponse response = client.indices().getMapping(request, RequestOptions.DEFAULT);
return response.toString();
} catch (Exception e) {
log.error("向es發(fā)起查詢索引映射字段請求失敗，請求參數(shù)：" + indexName, e);
}
return StringUtils.EMPTY;
}
/**
* 添加索引映射字段
* @param indexName
* @return
*/
public void addMapping(String indexName, Map<String, Object> mapping){
try {
PutMappingRequest request = new PutMappingRequest();
request.indices(indexName);
request.type("_doc");
//添加字段
request.source(mapping);
AcknowledgedResponse response = client.indices().putMapping(request, RequestOptions.DEFAULT);
if(!response.isAcknowledged()){
throw new CommonException("向es發(fā)起添加索引映射字段請求失敗");
}
log.info("向es發(fā)起添加索引映射字段請求成功，請求參數(shù)：{}", toJson(request));
} catch (Exception e) {
log.error("向es發(fā)起添加索引映射字段請求失敗，請求參數(shù)：" + indexName, e);
throw new CommonException("向es發(fā)起添加索引映射字段請求失敗");
}
}
/**
* 向索引中添加文檔
* @param indexName
* @param id
* @param obj
*/
public void addDocument(String indexName, String id, Object obj){
try {
//向索引中添加文檔
IndexRequest request = new IndexRequest();
// 外層參數(shù)
request.id(id);
request.index(indexName);
request.type("_doc");
// 存入對象
request.source(toJson(obj), XContentType.JSON);
// 發(fā)送請求
IndexResponse response = client.index(request, RequestOptions.DEFAULT);
if(response.status().getStatus() >= 400){
log.warn("向es發(fā)起添加文檔數(shù)據(jù)請求失敗，請求參數(shù)：{}，返回參數(shù)：{}", request.toString(), response.toString());
throw new CommonException("向es發(fā)起添加文檔數(shù)據(jù)請求失敗");
}
} catch (Exception e) {
log.error("向es發(fā)起添加文檔數(shù)據(jù)請求失敗，請求參數(shù)：" + indexName, e);
throw new CommonException("向es發(fā)起添加文檔數(shù)據(jù)請求失敗");
}
}
/**
* 修改索引中的文檔數(shù)據(jù)
* @param indexName
* @param id
* @param obj
*/
public void updateDocument(String indexName, String id, Map<String,Object> obj){
try {
//修改索引中的文檔數(shù)據(jù)
UpdateRequest request = new UpdateRequest();
// 外層參數(shù)
request.id(id);
request.index(indexName);
request.type("_doc");
// 存入對象
request.doc(obj);
request.doc(toJson(obj), XContentType.JSON);
// 發(fā)送請求
UpdateResponse response = client.update(request, RequestOptions.DEFAULT);
if(response.status().getStatus() >= 400){
log.warn("向es發(fā)起修改文檔數(shù)據(jù)請求失敗，請求參數(shù)：{}，返回參數(shù)：{}", request.toString(), response.toString());
throw new CommonException("向es發(fā)起修改文檔數(shù)據(jù)請求失敗");
}
} catch (Exception e) {
log.error("向es發(fā)起修改文檔數(shù)據(jù)請求失敗，請求參數(shù)：" + indexName, e);
throw new CommonException("向es發(fā)起修改文檔數(shù)據(jù)請求失敗");
}
}
/**
* 刪除索引中的文檔數(shù)據(jù)
* @param indexName
* @param id
*/
public void deleteDocument(String indexName, String id){
try {
//刪除索引中的文檔數(shù)據(jù)
DeleteRequest request = new DeleteRequest();
// 外層參數(shù)
request.id(id);
request.index(indexName);
request.type("_doc");
// 發(fā)送請求
DeleteResponse response = client.delete(request, RequestOptions.DEFAULT);
if(response.status().getStatus() >= 400){
log.warn("向es發(fā)起刪除文檔數(shù)據(jù)請求失敗，請求參數(shù)：{}，返回參數(shù)：{}", request.toString(), response.toString());
throw new CommonException("向es發(fā)起刪除文檔數(shù)據(jù)請求失敗");
}
} catch (Exception e) {
log.error("向es發(fā)起刪除文檔數(shù)據(jù)請求失敗，請求參數(shù)：" + indexName, e);
throw new CommonException("向es發(fā)起刪除文檔數(shù)據(jù)請求失敗");
}
}
/**
* 查詢索引中的文檔數(shù)據(jù)
* @param indexName
* @param id
*/
public String getDocumentById(String indexName, String id){
try {
GetRequest request = new GetRequest();
// 外層參數(shù)
request.id(id);
request.index(indexName);
request.type("_doc");
// 發(fā)送請求
GetResponse response = client.get(request, RequestOptions.DEFAULT);
response.getSourceAsString();
} catch (Exception e) {
log.error("向es發(fā)起查詢文檔數(shù)據(jù)請求失敗，請求參數(shù)：" + indexName, e);
}
return StringUtils.EMPTY;
}
/**
* 索引高級查詢
* @param indexName
* @param source
* @return
*/
public SearchResponse searchDocument(String indexName, SearchSourceBuilder source){
//搜索
SearchRequest searchRequest = new SearchRequest();
searchRequest.indices(indexName);
searchRequest.source(source);
try {
// 執(zhí)行請求
SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
return response;
} catch (Exception e) {
log.warn("向es發(fā)起查詢文檔數(shù)據(jù)請求失敗，請求參數(shù)：" + searchRequest.toString(), e);
}
return null;
}
/**
* 將對象格式化成json，并保持原字段類型輸出
* @param object
* @return
*/
private String toJson(Object object) {
try {
return objectMapper.writeValueAsString(object);
} catch (Exception e) {
throw new CommonException(e);
}
}
}2.3初始化索引結(jié)構(gòu)
在使用 es 對訂單進(jìn)行查詢搜索時(shí)，我們需要先定義好對應(yīng)的訂單索引結(jié)構(gòu)，內(nèi)容如下：
@ActiveProfiles("dev")
@RunWith(SpringRunner.class)
@SpringBootTest
public class OrderIndexServiceJunit {
@Autowired
private ElasticSearchClient elasticSearchClient;
/**
* 初始化索引結(jié)構(gòu)
*
* @return
*/
@Test
public void initIndex(){
String indexName = "orderIndex-2022-07";
// 創(chuàng)建請求
boolean existsIndex = elasticSearchClient.existsIndex(indexName);
if (!existsIndex) {
Map<String, Object> properties = buildMapping();
elasticSearchClient.createIndex(indexName, properties);
}
}
/**
* 構(gòu)建索引結(jié)構(gòu)
*
* @return
*/
private Map<String, Object> buildMapping() {
Map<String, Object> properties = new HashMap();
//訂單id 唯一鍵ID
properties.put("orderId", ImmutableBiMap.of("type", "keyword"));
//訂單號
properties.put("orderNo", ImmutableBiMap.of("type", "keyword"));
//客戶姓名
properties.put("orderUserName", ImmutableBiMap.of("type", "text"));
//訂單項(xiàng)
Map<String, Object> orderItems = new HashMap();
//訂單項(xiàng)ID
orderItems.put("orderItemId", ImmutableBiMap.of("type", "keyword"));
//產(chǎn)品名稱
orderItems.put("productName", ImmutableBiMap.of("type", "text"));
//品牌名稱
orderItems.put("brandName", ImmutableBiMap.of("type", "text"));
//銷售金額,單位分*100
orderItems.put("sellPrice", ImmutableBiMap.of("type", "integer"));
properties.put("orderItems", ImmutableBiMap.of("type", "nested", "properties", orderItems));
//文檔結(jié)構(gòu)映射
Map<String, Object> mapping = new HashMap();
mapping.put("properties", properties);
return mapping;
}
}2.4向 es 中同步文檔數(shù)據(jù)
索引結(jié)構(gòu)創(chuàng)建好之后，我們需要將支持 es 搜索的訂單數(shù)據(jù)同步進(jìn)去。
將指定的訂單 ID 從數(shù)據(jù)庫查詢出來，并封裝成 es 訂單數(shù)據(jù)結(jié)構(gòu)，保存到 es 中！
@ActiveProfiles("dev")
@RunWith(SpringRunner.class)
@SpringBootTest
public class OrderIndexServiceJunit {
@Autowired
private ElasticSearchClient elasticSearchClient;
/**
* 保存訂單到ES中
* @param request
*/
@Test
public void saveDocument(){
String indexName = "orderIndex-2022-07";
//從數(shù)據(jù)庫查詢最新訂單數(shù)據(jù)，并封裝成對應(yīng)的es訂單結(jié)構(gòu)
String orderId = "202202020202";
OrderIndexDocDTO indexDocDTO = buildOrderIndexDocDTO(orderId);
//保存數(shù)據(jù)到ES中
elasticSearchClient.addDocument(indexName, indexDocDTO.getOrderId(), indexDocDTO);
}
}2.5內(nèi)嵌對象查詢
內(nèi)嵌對象查詢分兩種形式，比如，第一種通過商品、品牌、價(jià)格等條件，分頁查詢訂單數(shù)據(jù)；第二種是通過訂單ID、商品、品牌、價(jià)格等，分頁查詢訂單項(xiàng)數(shù)據(jù)。具體的實(shí)踐，請看下文。
通過商品、品牌、價(jià)格等條件，分頁查詢訂單數(shù)據(jù)；
@ActiveProfiles("dev")
@RunWith(SpringRunner.class)
@SpringBootTest
public class OrderIndexServiceJunit {
@Autowired
private ElasticSearchClient elasticSearchClient;
/**
* 通過商品、品牌、價(jià)格等條件，分頁查詢訂單數(shù)據(jù)
* @param request
*/
@Test
public void search1(){
//查詢索引，支持通配符
String indexName = "orderIndex-*";
String orderUserName = "張三";
String productName = "薯?xiàng)l";
// 條件搜索
SearchSourceBuilder builder = new SearchSourceBuilder();
//組合搜索
BoolQueryBuilder mainBoolQuery = new BoolQueryBuilder();
mainBoolQuery.must(QueryBuilders.matchQuery("orderUserName", orderUserName));
//訂單項(xiàng)相關(guān)信息搜索
BoolQueryBuilder nestedBoolQuery = new BoolQueryBuilder(); nestedBoolQuery.must(QueryBuilders.matchQuery("orderItems.productName", productName));
//內(nèi)嵌對象搜索，需要指定path
NestedQueryBuilder nestedQueryBuilder = QueryBuilders.nestedQuery("orderItems",nestedBoolQuery, ScoreMode.None);
//子表查詢
mainBoolQuery.must(nestedQueryBuilder);
//封裝查詢參數(shù)
builder.query(mainBoolQuery);
//返回參數(shù)
builder.fetchSource(new String[]{}, new String[]{});
//結(jié)果集合分頁，從第一頁開始，返回最多四條數(shù)據(jù)
builder.from(0).size(4);
//排序
builder.sort("orderId", SortOrder.DESC);
log.info("dsl：{}", builder.toString());
// 執(zhí)行請求
SearchResponse response = elasticSearchClient.searchDocument(indexName, builder);
// 當(dāng)前返回的總行數(shù)
long count = response.getHits().getTotalHits();
// 返回的具體行數(shù)
SearchHit[] searchHits = response.getHits().getHits();
log.info("response：{}", response.toString());
}
}通過訂單ID、商品、品牌、價(jià)格等，分頁查詢訂單項(xiàng)數(shù)據(jù)；
@ActiveProfiles("dev")
@RunWith(SpringRunner.class)
@SpringBootTest
public class OrderIndexServiceJunit {
@Autowired
private ElasticSearchClient elasticSearchClient;
/**
* 通過訂單ID、商品、品牌、價(jià)格等，分頁查詢訂單項(xiàng)數(shù)據(jù)
* @param request
*/
@Test
public void search2(){
//查詢索引，支持通配符
String indexName = "orderIndex-*";
String orderId = "202202020202";
String productName = "薯?xiàng)l";
// 條件搜索
SearchSourceBuilder builder = new SearchSourceBuilder();
//組合搜索
BoolQueryBuilder mainBoolQuery = new BoolQueryBuilder();
mainBoolQuery.must(QueryBuilders.termQuery("_id", orderId));
//訂單項(xiàng)相關(guān)信息搜索
BoolQueryBuilder nestedBoolQuery = new BoolQueryBuilder(); nestedBoolQuery.must(QueryBuilders.matchQuery("orderItems.productName", productName));
//內(nèi)嵌對象搜索，需要指定path
NestedQueryBuilder nestedQueryBuilder = QueryBuilders.nestedQuery("orderItems",nestedBoolQuery, ScoreMode.None);
//內(nèi)嵌對象分頁查詢
InnerHitBuilder innerHitBuilder = new InnerHitBuilder();
//結(jié)果集合分頁，從第一頁開始，返回最多四條數(shù)據(jù)
innerHitBuilder.setFrom(0).setSize(4);
//只返回訂單項(xiàng)id
innerHitBuilder.setFetchSourceContext(new FetchSourceContext(true, new String[]{"orderItems.orderItemId"}, new String[]{}));
innerHitBuilder.addSort(SortBuilders.fieldSort("orderItems.orderItemId").order(SortOrder.DESC));
nestedQueryBuilder.innerHit(innerHitBuilder);
//子表查詢
mainBoolQuery.must(nestedQueryBuilder);
//封裝查詢參數(shù)
builder.query(mainBoolQuery);
//返回參數(shù)
builder.fetchSource(new String[]{}, new String[]{});
//結(jié)果集合分頁，從第一頁開始，返回最多四條數(shù)據(jù)
builder.from(0).size(4);
//排序
builder.sort("orderId", SortOrder.DESC);
log.info("dsl：{}", builder.toString());
// 執(zhí)行請求
SearchResponse response = elasticSearchClient.searchDocument(indexName, builder);
// 當(dāng)前返回的訂單主表總行數(shù)
long count = response.getHits().getTotalHits();
// 返回的訂單主表數(shù)據(jù)
SearchHit[] searchHits = response.getHits().getHits();
// 返回查詢的的訂單項(xiàng)分頁數(shù)據(jù)
Map<String, SearchHits> = searchHit[0].getInnerHits();
log.info("response：{}", response.toString());
}
}三、小結(jié)
本文主要以通過商品名稱查詢訂單數(shù)據(jù)為案例，介紹利用 SpringBoot 整合 es 實(shí)現(xiàn)數(shù)據(jù)的高效搜索，內(nèi)容如果難免有些遺漏，歡迎網(wǎng)友指出！
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