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本篇内容主要讲解“elasticsearch7.2的增删改查语法”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“elasticsearch7.2的增删改查语法”吧!
<!-- 引入Elasticsearch相关jar包--> <dependency> <groupId>org.elasticsearch</groupId> <artifactId>elasticsearch</artifactId> <version>7.2.0</version> </dependency> <!-- <dependency>--> <!-- <groupId>org.elasticsearch.client</groupId>--> <!-- <artifactId>transport</artifactId>--> <!-- <version>7.2.0</version>--> <!-- </dependency>--> <dependency> <groupId>org.elasticsearch.client</groupId> <artifactId>elasticsearch-rest-high-level-client</artifactId> <version>7.2.0</version> </dependency> <dependency> <groupId>org.elasticsearch.client</groupId> <artifactId>elasticsearch-rest-client</artifactId> <version>7.2.0</version> </dependency> <!-- <dependency> <groupId>org.apache.lucene</groupId> <artifactId>lucene-core</artifactId> <version>8.0.0</version> </dependency> -->
代码如下:
import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONObject; import org.apache.http.HttpHost; //import org.elasticsearch.action.get.GetRequest; //import org.elasticsearch.action.get.GetResponse; import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest; import org.elasticsearch.action.delete.DeleteRequest; 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.update.UpdateRequest; import org.elasticsearch.client.RequestOptions; import org.elasticsearch.client.RestClient; import org.elasticsearch.client.RestHighLevelClient; import org.elasticsearch.index.query.BoolQueryBuilder; //import org.elasticsearch.index.query.QueryBuilder; import org.elasticsearch.index.query.QueryBuilders; import org.elasticsearch.search.SearchHit; import org.elasticsearch.search.builder.SearchSourceBuilder; import java.io.IOException; import java.util.*;
public class Demo1 { private static RestHighLevelClient client; private static final String ip="170.60.140.120"; private static final int port=9200;
public static void main(String[] args) throws Exception{ client=new RestHighLevelClient(RestClient.builder( new HttpHost(ip, port, "http"))); // indexincrement(); indexsearch(); // indexdelete(); // indexupdate(); client.close(); }
创建索引
private static void indexincrement() throws Exception{ HashMap<String, Object> jsonmap = new HashMap<>(); jsonmap.put("name","王五"); jsonmap.put("age",32); IndexRequest indexRequest = new IndexRequest("post").source(jsonmap); IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT); System.out.println("indexresponse = "+indexResponse); System.out.println("indexResponse.status() = "+indexResponse.status()); }
删除索引
private static void indexdelete() throws Exception{ //第一种,按索引id删除某个文档。 /* DeleteRequest deleteRequest = new DeleteRequest("post", "m56EDXIBK5FuWnazQHHa"); client.delete(deleteRequest,RequestOptions.DEFAULT);*/ //第二种,一次性删除整个索引 /* DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest("post"); client.indices().delete(deleteIndexRequest,RequestOptions.DEFAULT); */ //第三种,先按条件查询出某范围内所有Id,再一个一个删除 BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery(); SearchSourceBuilder sourceBuilder = new SearchSourceBuilder(); sourceBuilder.query(boolQueryBuilder); sourceBuilder.size(100); SearchRequest searchRequest = new SearchRequest().indices("post"); searchRequest.source(sourceBuilder); SearchResponse response1 = client.search(searchRequest, RequestOptions.DEFAULT); SearchHit[] hits = response1.getHits().getHits(); for(SearchHit hit:hits){ String id = hit.getId(); DeleteRequest deleteRequest = new DeleteRequest("post", id); client.delete(deleteRequest,RequestOptions.DEFAULT); }
更新文档,(以map方式为例)
private static void indexupdate() throws Exception{ UpdateRequest updateRequest = new UpdateRequest("post","kCfJHHIBCUDx2GUCB0Dk"); HashMap<String, Object> jsonmap = new HashMap<>(); jsonmap.put("name","赵六"); jsonmap.put("age",16); updateRequest.doc(jsonmap); client.update(updateRequest,RequestOptions.DEFAULT); }
查询索引
private static void indexsearch(Connection conn) throws Exception{ /* 第一种,按某个id号查询方式 GetRequest getRequest = new GetRequest("risklog", "rpBmNnIB76i_tBrAwvlC"); GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);*/ /* 第二种,按条件查询整个索引表方式 */ BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery(); SearchSourceBuilder sourceBuilder = new SearchSourceBuilder(); sourceBuilder.query(boolQueryBuilder); //这里设置查询7万条数据 sourceBuilder.size(70000); // SearchRequest searchRequest=new SearchRequest(); SearchRequest searchRequest = new SearchRequest().indices("middleware_apache_server_access"); searchRequest.source(sourceBuilder); SearchResponse response1 = client.search(searchRequest, RequestOptions.DEFAULT); List<JSONObject> list = new ArrayList<>(); response1.getHits().forEach(item -> list.add(JSON.parseObject(item.getSourceAsString()))); System.out.println("list.size() = "+list.size()); // Iterator<JSONObject> iterator = list.iterator(); for(int i=0;i<list.size();i++){ JSONObject jsonObject = list.get(i); System.out.println("jsonObject = "+jsonObject); } }
}
到此,相信大家对“elasticsearch7.2的增删改查语法”有了更深的了解,不妨来实际操作一番吧!这里是亿速云网站,更多相关内容可以进入相关频道进行查询,关注我们,继续学习!
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