Elasticsearch QueryBuilder简单查询实现解析

2019-11-26 08:45:32

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elasticsearch中存储的全部文档

1.matchAllQuery()

matchAllQuery()方法用来匹配全部文档

public class QueryTest {   public static void main(String[] args) {     //创建对象，设置集群名称和IP地址     ElasticsearchUtils es = new ElasticsearchUtils("im_shan",         "localhost");     String indexName = "school";//索引名称     String typeName = "student";//类型名称     //搜索全部文档     QueryBuilder queryBuilder = QueryBuilders.matchAllQuery();     SearchResponse searchResponse = es.searcher(indexName, typeName,       queryBuilder);     SearchHits hits = searchResponse.getHits();     SearchHit[] searchHits = hits.getHits();     int i = 0;     for (SearchHit searchHit : searchHits) {       String name = (String) searchHit.getSource().get("name");       String birth = (String) searchHit.getSource().get("birth");       String interest = (String) searchHit.getSource().get("interest");       System.out.println("-------------" + (++i) + "------------");       System.out.println(name);       System.out.println(birth);       System.out.println(interest);     }    } }

控制台将输出全部文档

输出： -------------1------------ amy 1995-11-10 singing dancing -------------2------------ angle 1996-05-01 singing reading -------------3------------ jackson 1995-08-01 basketball music reading -------------4------------ jack 1995-03-21 football music -------------5------------ tom 1995-09-11 reading music

2.matchQuery(String name,Object text)

matchQuery("filedname","value")匹配单个字段，匹配字段名为filedname,值为value的文档

java] view plain copy //单个匹配，搜索name为jack的文档 QueryBuilder queryBuilder = QueryBuilders.matchQuery("name", "jack");

此时会输出一条记录，因为只有一个name为jack的文档

-------------1------------ jack 1995-03-21 football music

3.multiMatchQuery(Object text, String... fieldNames)

多个字段匹配某一个值

[java] view plain copyQueryBuilder queryBuilder = QueryBuilders.multiMatchQuery("music",       "name", "interest");//搜索name中或interest中包含有music的文档（必须与music一致）

控制台输出如下

-------------1------------ jack 1995-03-21 football music -------------2------------ tom 1995-09-11 reading music -------------3------------ jackson 1995-08-01 basketball music reading

4.wildcardQuery()模糊查询

模糊查询，?匹配单个字符，*匹配多个字符

WildcardQueryBuilder queryBuilder = QueryBuilders.wildcardQuery("name",       "*jack*");//搜索名字中含有jack文档（name中只要包含jack即可）

控制台输出如下

-------------1------------ jackson 1995-08-01 basketball music reading -------------2------------ jack 1995-03-21 football music

5.使用BoolQueryBuilder进行复合查询

使用must

java] view plain copy//模糊查询 WildcardQueryBuilder queryBuilder1 = QueryBuilders.wildcardQuery(       "name", "*jack*");//搜索名字中含有jack的文档 WildcardQueryBuilder queryBuilder2 = QueryBuilders.wildcardQuery(       "interest", "*read*");//搜索interest中含有read的文档  BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery(); //name中必须含有jack,interest中必须含有read,相当于and boolQueryBuilder.must(queryBuilder1); boolQueryBuilder.must(queryBuilder2);

控制台输出如下（name中必须含有jack,interest中必须含有read,只有一条文档匹配）：

-------------1------------ jackson 1995-08-01 basketball music reading

使用should

WildcardQueryBuilder queryBuilder1 = QueryBuilders.wildcardQuery(       "name", "*jack*");//搜索名字中含有jack的文档 WildcardQueryBuilder queryBuilder2 = QueryBuilders.wildcardQuery(       "interest", "*read*");//搜索interest中含有read的文档  BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery(); //name中含有jack或者interest含有read，相当于or boolQueryBuilder.should(queryBuilder1); boolQueryBuilder.should(queryBuilder2);

控制台输出（name中含有jack或者interest中含有read的都将被匹配）：

------------1------------ jackson 1995-08-01 basketball music reading -------------2------------ angle 1996-05-01 singing reading -------------3------------ jack 1995-03-21 football music -------------4------------ tom 1995-09-11 reading music

6.分页

通过from和size参数进行分页。From定义查询结果开始位置，size定义返回的hits（一条hit对应一条记录）最大数量。