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此篇博客还是一些基础操作#xff0c;没什么可写的#xff0c;需要的同学直接抄作业进行测试就可以
上一节写了连接和测试新增操作,这一节写java操作ES的基本操作,也就是增删改查,在这里补充一点知识,我们之前用了指定的索引进行指定添加 有一个情况是,如果我们指定了…前言
此篇博客还是一些基础操作没什么可写的需要的同学直接抄作业进行测试就可以
上一节写了连接和测试新增操作,这一节写java操作ES的基本操作,也就是增删改查,在这里补充一点知识,我们之前用了指定的索引进行指定添加 有一个情况是,如果我们指定了一个不存在的索引时,他会创建一个新的索引,例如我们这个ik1是不存在的,执行添加后也可以添加进去,索引库会新增一个叫ik1的索引,如图 一、查询
注查询时需要查询存在的索引不存在会报错提示not found /*** 查询测试*/Testpublic void testRetrieve() throws IOException {GetRequest getRequest new GetRequest(ik,5);GetResponse response client.get(getRequest,RequestOptions.DEFAULT);System.out.println(response);} 二、更新
忽略警告
/*** 更新** throws IOException*/Testpublic void testUpdate() throws IOException {HashMapString,Object map new HashMap();map.put(name,哈西布鲁根);map.put(content,拳皇99);UpdateRequest updateRequest new UpdateRequest(ik,5).doc(map);UpdateResponse updateResponse client.update(updateRequest,RequestOptions.DEFAULT);System.out.println(updateRequest);} 三、删除
/*** 删除*/Testpublic void testDelete() throws IOException {DeleteRequest deleteRequest new DeleteRequest(ik,5);DeleteResponse deleteResponse client.delete(deleteRequest,RequestOptions.DEFAULT);System.out.println(deleteRequest);} 四、批量增删改
其实就是增加了一个容器BulkRequest把所有操作放到了这个容器里然后同意操作
为了查看效果注释了删除 /*** 批量增删改*/Testpublic void testCUD() throws IOException {BulkRequest request new BulkRequest();/** 增加IndexRequest* XContentType键值对*/request.add(new IndexRequest(ik).id(5).source(XContentType.JSON,name,罗翔,content,法外狂徒张三));/** 更新UpdateRequest*/request.add(new UpdateRequest(ik,5).doc(XContentType.JSON,name,罗翔,content,法外狂徒李四));/** 删除DeleteRequest*/
// request.add(new DeleteRequest(ik).id(5));BulkResponse bulkResponse client.bulk(request,RequestOptions.DEFAULT);System.out.println(bulkResponse.toString());} 五、查询
1.查询全部
查询全部,可变参数可指定多个索引,如果结果超过十条,默认返回十条
/*** 查询** throws IOException*/Testpublic void testQuery() throws IOException {//可以指定多个索引,用逗号隔开SearchRequest searchRequest new SearchRequest(ik,shop);SearchSourceBuilder searchSourceBuilder new SearchSourceBuilder();//查询所有searchSourceBuilder.query(QueryBuilders.matchAllQuery());searchRequest.source(searchSourceBuilder);SearchResponse response client.search(searchRequest,RequestOptions.DEFAULT);System.out.println(response);} 查询结果是一个JSON,转了一下格式,看着清晰一点,查出来的内容是不能直接使用的,所以还需要转换格式 取出我们想要的部分,图例说明更清晰一些 有三种方式,根据实际使用情况选择,详见注释
/*** 查询** throws IOException*/Testpublic void testQuery() throws IOException {//可以指定多个索引,用逗号隔开SearchRequest searchRequest new SearchRequest(ik,shop);SearchSourceBuilder searchSourceBuilder new SearchSourceBuilder();//查询所有,如果结果超过10条,默认显示10条searchSourceBuilder.query(QueryBuilders.matchAllQuery());searchRequest.source(searchSourceBuilder);SearchResponse response client.search(searchRequest,RequestOptions.DEFAULT);//调整结构,取出需要的部分long value response.getHits().getTotalHits().value;System.out.println(response);if(0value){SearchHit[] hits response.getHits().getHits();for(SearchHit hit : hits){System.out.println(hit.getIndex());System.out.println(hit.getId());System.out.println(hit.getScore());//三种方式,根据实际使用情况选择System.out.println(hit.getSourceAsMap());System.out.println(hit.getSourceAsString());System.out.println(hit.getSourceRef());System.out.println();}}} 2.按照条件查询
按照条件查询可以分为单字段单索引,单字段多索引,多字段单索引,多字段多索引,多个用逗号隔开就行,有点区别,但区别不大,详见代码注释
/*** 根据条件查询** throws IOException*/Testpublic void testQueryMatch() throws IOException {//可以指定多个索引,用逗号隔开SearchRequest searchRequest new SearchRequest(ik,shop);SearchSourceBuilder searchSourceBuilder new SearchSourceBuilder();//单字段匹配--字段对值
// searchSourceBuilder.query(QueryBuilders.matchQuery(content,中国));//多字段匹配--值对多字段searchSourceBuilder.query(QueryBuilders.multiMatchQuery(中国,content,name));searchRequest.source(searchSourceBuilder);SearchResponse response client.search(searchRequest,RequestOptions.DEFAULT);//调整结构,取出需要的部分long value response.getHits().getTotalHits().value;System.out.println(response);if(0value){SearchHit[] hits response.getHits().getHits();for(SearchHit hit : hits){System.out.println(hit.getIndex());System.out.println(hit.getId());System.out.println(hit.getScore());//三种方式,根据实际使用情况选择System.out.println(hit.getSourceAsMap());System.out.println(hit.getSourceAsString());System.out.println(hit.getSourceRef());System.out.println();}}} 3.排序 /*** 排序** throws IOException*/Testpublic void testQuerySortHighLevel() throws IOException {//可以指定多个索引,用逗号隔开SearchRequest searchRequest new SearchRequest(ik,shop);SearchSourceBuilder searchSourceBuilder new SearchSourceBuilder();//多字段匹配--值对多字段searchSourceBuilder.query(QueryBuilders.multiMatchQuery(中国,content,name));//从第几位开始分几条,分别是索引下标,大小//分页查询默认查询倒序searchSourceBuilder.from(0).size(5);
// //正序写法
// searchSourceBuilder.sort(SortBuilders.scoreSort().order(SortOrder.ASC));/** 指定字段排序* 注意不是数据库里面的字段,是es里面的字段* 默认正序,倒序.order(SortOrder.DESC))** 指定字段后,分数排序失效*/searchSourceBuilder.sort(SortBuilders.fieldSort(id));searchRequest.source(searchSourceBuilder);SearchResponse response client.search(searchRequest,RequestOptions.DEFAULT);//调整结构,取出需要的部分long value response.getHits().getTotalHits().value;System.out.println(response);if(0value){SearchHit[] hits response.getHits().getHits();for(SearchHit hit : hits){System.out.println(hit.getIndex());System.out.println(hit.getId());System.out.println(hit.getScore());//三种方式,根据实际使用情况选择System.out.println(hit.getSourceAsMap());System.out.println(hit.getSourceAsString());System.out.println(hit.getSourceRef());System.out.println();}}} 4.高亮
/*** 排序** throws IOException*/Testpublic void testQuerySortHighLevel() throws IOException {//可以指定多个索引,用逗号隔开SearchRequest searchRequest new SearchRequest(ik,shop);SearchSourceBuilder searchSourceBuilder new SearchSourceBuilder();//多字段匹配--值对多字段searchSourceBuilder.query(QueryBuilders.multiMatchQuery(中国,content,name));//从第几位开始分几条,分别是索引下标,大小//分页查询默认查询倒序searchSourceBuilder.from(0).size(5);
// //正序写法searchSourceBuilder.sort(SortBuilders.scoreSort().order(SortOrder.ASC));/** 指定字段排序* 注意不是数据库里面的字段,是es里面的字段* 默认正序,倒序.order(SortOrder.DESC))** 指定字段后,分数排序失效*/
// searchSourceBuilder.sort(SortBuilders.fieldSort(id));//高亮HighlightBuilder highlightBuilder new HighlightBuilder().field(content).preTags(p stylecolor:red).postTags(/);searchSourceBuilder.highlighter(highlightBuilder);searchRequest.source(searchSourceBuilder);SearchResponse response client.search(searchRequest,RequestOptions.DEFAULT);//调整结构,取出需要的部分long value response.getHits().getTotalHits().value;System.out.println(response);if(0value){SearchHit[] hits response.getHits().getHits();for(SearchHit hit : hits){System.out.println(hit.getIndex());System.out.println(hit.getId());System.out.println(hit.getScore());//三种方式,根据实际使用情况选择System.out.println(hit.getSourceAsMap());System.out.println(hit.getSourceAsString());System.out.println(hit.getSourceRef());//显示高亮.fragments取文本System.out.println(hl: String.valueOf(hit.getHighlightFields().get(content).fragments()[0]));System.out.println();}}} 写在最后
一些基础用法,详见注释,都能用
