sqlappend select nvlcountaid0 zs ; sqlappend nvlsumcase when ahpzl like 小型 then 1 else 0 end0 xxsl ; sqlappend nvlsumcase when ahpzl like 大型 then 1 else 0 end0 dxsl ;如何使用RestHigh
要使用RestHighLevelClient实现与上述SQL相同的功能,您需要执行以下步骤:
- 首先,您需要创建一个RestHighLevelClient实例,用于与Elasticsearch进行通信。您可以使用以下代码创建一个RestHighLevelClient实例:
RestHighLevelClient client = new RestHighLevelClient(
RestClient.builder(
new HttpHost("localhost", 9200, "http")));
- 接下来,您需要构建一个SearchRequest对象,该对象表示您要执行的Elasticsearch搜索请求。您可以使用以下代码创建SearchRequest对象:
SearchRequest searchRequest = new SearchRequest("your_index_name");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
- 然后,您需要构建一个TermsAggregationBuilder对象,该对象表示您要执行的聚合操作。您可以使用以下代码创建TermsAggregationBuilder对象:
TermsAggregationBuilder zsAggregation = AggregationBuilders.terms("zs").field("id");
TermsAggregationBuilder xxslAggregation = AggregationBuilders.terms("xxsl").field("hpzl").include(".*小型.*");
TermsAggregationBuilder dxslAggregation = AggregationBuilders.terms("dxsl").field("hpzl").include(".*大型.*");
- 接下来,您需要将这些聚合操作添加到SearchSourceBuilder对象中。您可以使用以下代码将聚合操作添加到SearchSourceBuilder对象中:
searchSourceBuilder.aggregation(zsAggregation);
searchSourceBuilder.aggregation(xxslAggregation);
searchSourceBuilder.aggregation(dxslAggregation);
- 最后,您需要执行搜索请求,并获取响应结果。您可以使用以下代码执行搜索请求:
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
- 您可以从SearchResponse对象中获取聚合结果。您可以使用以下代码获取聚合结果:
Terms zsTerms = searchResponse.getAggregations().get("zs");
Terms xxslTerms = searchResponse.getAggregations().get("xxsl");
Terms dxslTerms = searchResponse.getAggregations().get("dxsl");
long zsCount = zsTerms.getBuckets().size();
long xxslCount = xxslTerms.getBuckets().size();
long dxslCount = dxslTerms.getBuckets().size();
这样,您就可以使用RestHighLevelClient实现与上述SQL相同的功能。请注意,上述代码仅提供了基本的示例,您可能需要根据您的实际需求进行适当的调整
原文地址: http://www.cveoy.top/t/topic/iFfz 著作权归作者所有。请勿转载和采集!