ES High Level REST Client API 查詢 聚合

• 1 準(zhǔn)備數(shù)據(jù)
• • 1.1 插入測(cè)試數(shù)據(jù)
• 2 Maven引入ES
• 3 創(chuàng)建Client
• 4 查詢API
• • 4.1 根據(jù)id查詢單條數(shù)據(jù)
  • 4.2 根據(jù)多個(gè)id查詢
  • 4.3 根據(jù)條件分頁查詢
  • 4.4 count
  • 4.5 max
• 5 terms聚合
• • 5.1 根據(jù)1個(gè)字段group by
  • 5.2 根據(jù)多個(gè)字段group by

關(guān)于聚合的博客：
Elasticsearch教程(3) ES聚合查詢DSL

Elasticsearch教程(4) High Level REST Client API 查詢 聚合 分組

Elasticsearch教程(5) 指標(biāo)聚合 SQL DSL JavaAPI

Elasticsearch教程(6) 桶聚合Query DSL-Terms Aggregation

Elasticsearch教程(10) ES term terms prefix 搜索 聚合查詢 詳細(xì)總結(jié)

Elasticsearch教程(11) elasticsearch 桶聚合 Query DSL

Elasticsearch教程(32) ES 聚合查詢后過濾 Distinct Group By Having功能

1 準(zhǔn)備數(shù)據(jù)

首先啟動(dòng)好的ES6.8服務(wù)和Kibana服務(wù)

1.1 插入測(cè)試數(shù)據(jù)

假設(shè)有個(gè)部門組織的場(chǎng)景，部門有上級(jí)部門或者下級(jí)部門，像一顆樹那樣

字段注釋

code	部門編號(hào)
name	部門名稱
level	層級(jí)
path	從祖先到自己的id路徑
parentId	父部門Id （這里沒有id字段，因?yàn)閑s自帶_id這個(gè)字段了）
status	狀態(tài)

PUT /dept/_doc/1 {"code": "dept_1","name": "部門1","level": 1,"path": "1","parentId": "","status":1 }PUT /dept/_doc/2 {"code": "dept_2","name": "部門2","level": 1,"path": "2","parentId": "","status":0 }PUT /dept/_doc/3 {"code": "dept_1_1","name": "部門1_1","level": 2,"path": "1,3","parentId": "1","status":0 }PUT /dept/_doc/4 {"code": "dept_1_2","name": "部門1_2","level": 2,"path": "1,4","parentId": "1","status":0 }PUT /dept/_doc/5 {"code": "dept_1_1_1","name": "部門1_1_1","level": 3,"path": "1,3,5","parentId": "3","status":1 }PUT /dept/_doc/6 {"code": "dept_1_1_2","name": "部門1_1_2","level": 3,"path": "1,3,6","parentId": "3","status":null }

數(shù)據(jù)結(jié)果如下：

2 Maven引入ES

新建一個(gè)空的Maven結(jié)構(gòu)項(xiàng)目，在pom.xml里添加如下

<dependency><groupId>org.elasticsearch.client</groupId><artifactId>elasticsearch-rest-high-level-client</artifactId><version>6.8.4</version> </dependency>

3 創(chuàng)建Client

public class EsRestUtils {private static RestHighLevelClient client;private static final String type = "_doc";public static RestHighLevelClient getClient() {if (client == null) {client = new RestHighLevelClient(RestClient.builder(new HttpHost("192.168.8.201", 9200, "http")));}return client;} }

4 查詢API

4.1 根據(jù)id查詢單條數(shù)據(jù)

用SQL描述就是

select * from dept where id = '1' protected static Map<String, Object> getById(String index, String id) throws IOException {getClient();GetRequest getRequest = new GetRequest(index, type, id);GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);if (getResponse.isExists()){return getResponse.getSourceAsMap();}return null; }

4.2 根據(jù)多個(gè)id查詢

用SQL描述就是

select * from dept where id in ("1", "2", "3") protected static List<Map<String, Object>> getByIds(String index, List<String> ids) throws IOException {getClient();List<Map<String, Object>> results = new ArrayList<>();MultiGetRequest request = new MultiGetRequest();ids.stream().forEach(id -> {request.add(new MultiGetRequest.Item(index, type, id));});MultiGetResponse response = client.mget(request, RequestOptions.DEFAULT);GetResponse getResponse;for (int i = 0; i < response.getResponses().length; i++) {getResponse = response.getResponses()[i].getResponse();if (getResponse.isExists()) {results.add(getResponse.getSourceAsMap());}}return results; }

4.3 根據(jù)條件分頁查詢

用SQL描述就是

select * from dept where id in ("1", "2", "3") limt 2,10 protected static List<Map<String, Object>> getByWhere(String index, QueryBuilder queryBuilder, int pageNo, int pageSize) throws IOException {getClient();List<Map<String, Object>> results = new ArrayList<>();SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();searchSourceBuilder.query(queryBuilder);searchSourceBuilder.from(pageNo);searchSourceBuilder.size(pageSize);SearchRequest searchRequest = new SearchRequest(index).types(type);searchRequest.source(searchSourceBuilder);SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);SearchHits hits = searchResponse.getHits();SearchHit[] searchHits = hits.getHits();for (SearchHit hit : searchHits) {results.add(hit.getSourceAsMap());}return results; }

4.4 count

用SQL描述就是

select count(1) from dept where name like '部門%' public static long count(QueryBuilder queryBuilder, String... indexs) throws IOException {getClient();SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();searchSourceBuilder.query(queryBuilder);CountRequest countRequest = new CountRequest(indexs);countRequest.source(searchSourceBuilder);CountResponse countResponse = client.count(countRequest, RequestOptions.DEFAULT);long count = countResponse.getCount();return count; }

4.5 max

用SQL描述就是

select max(level) from dept where name like '部門%' public static Double getMax(QueryBuilder queryBuilder, String field, String... indexs) throws IOException {getClient();SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();searchSourceBuilder.query(queryBuilder);searchSourceBuilder.size(0);AggregationBuilder aggregationBuilder = AggregationBuilders.max("agg").field(field);searchSourceBuilder.aggregation(aggregationBuilder);SearchRequest searchRequest = new SearchRequest(indexs).types(type);searchRequest.source(searchSourceBuilder);SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);Max agg = searchResponse.getAggregations().get("agg");return agg.getValue(); }

5 terms聚合

5.1 根據(jù)1個(gè)字段group by

用SQL描述就是

select level, count(id) from dept where name like '部門%' group by level public static Map<String, Long> getTermsAgg(QueryBuilder queryBuilder, String field, String... Map<String, Long> groupMap = new HashMap<>();getClient();SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();searchSourceBuilder.query(queryBuilder);searchSourceBuilder.size(0);AggregationBuilder aggregationBuilder = AggregationBuilders.terms("agg").field(field);searchSourceBuilder.aggregation(aggregationBuilder);SearchRequest searchRequest = new SearchRequest(indexs).types(type);searchRequest.source(searchSourceBuilder);SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);Terms terms = searchResponse.getAggregations().get("agg");for (Terms.Bucket entry : terms.getBuckets()) {groupMap.put(entry.getKey().toString(), entry.getDocCount());}return groupMap; }

寫代碼測(cè)試

protected static void testGetTermsAgg(String index) {QueryBuilder queryBuilder = QueryBuilders.wildcardQuery("name.keyword", "部門*");try {Map<String, Long> groupMap = EsRestUtils.getTermsAgg(queryBuilder, "level", index);groupMap.forEach((key, value) -> System.out.println(key + " -> " + value.toString()));} catch (IOException e) {e.printStackTrace();} }

運(yùn)行結(jié)果如下，左邊是level，右邊是個(gè)數(shù)

1 -> 2 2 -> 2 3 -> 2

5.2 根據(jù)多個(gè)字段group by

用SQL描述就是

select level, status, count(id) from dept where name like '部門%' group by level, status public static Map<String, Map<String, Long>> getTermsAggTwoLevel(QueryBuilder queryBuilder, String field1, String field2, String... indexs) throws IOException {Map<String, Map<String, Long>> groupMap = new HashMap<>();getClient();SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();searchSourceBuilder.query(queryBuilder);searchSourceBuilder.size(0);AggregationBuilder agg1 = AggregationBuilders.terms("agg1").field(field1);AggregationBuilder agg2 = AggregationBuilders.terms("agg2").field(field2);agg1.subAggregation(agg2);searchSourceBuilder.aggregation(agg1);SearchRequest searchRequest = new SearchRequest(indexs).types(type);searchRequest.source(searchSourceBuilder);SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);Terms terms1 = searchResponse.getAggregations().get("agg1");Terms terms2;for (Terms.Bucket bucket1 : terms1.getBuckets()) {terms2 = bucket1.getAggregations().get("agg2");Map<String, Long> map2 = new HashMap<>();for (Terms.Bucket bucket2 : terms2.getBuckets()) {map2.put(bucket2.getKey().toString(), bucket2.getDocCount());}groupMap.put(bucket1.getKey().toString(), map2);}return groupMap; }

寫代碼測(cè)試

protected static void testGetTermsAgg2(String index) {QueryBuilder queryBuilder = QueryBuilders.wildcardQuery("name.keyword", "部門*");try {Map<String, Map<String, Long>> groupMap = EsRestUtils.getTermsAggTwoLevel(queryBuilder, "level", "status", index);groupMap.forEach((key, value) -> System.out.println(key + " -> " + value.toString()));} catch (IOException e) {e.printStackTrace();} }

對(duì)于id=6的那條數(shù)據(jù)，status=null，就不會(huì)統(tǒng)計(jì)到，如果沒有status也不會(huì)統(tǒng)計(jì)到。

1 -> {0=1, 1=1}#leve=1的數(shù)據(jù)中，status=1的1條，status=0的1條 2 -> {0=2} #leve=2的數(shù)據(jù)中，status=0的2條 3 -> {1=1} #leve=3的數(shù)據(jù)中，status=1的1條

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