3-Elasticsearch查询API

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在上一节2-Elasticsearch集群数据批量导入中，我们向ES集群中批量导入了1000条数据。这一节通过Java API查询文档。

1、全文查询

查询文档中包含Beijing关键字的doc，不管该关键字出现在哪个字段中，只要包含都会返回。

public class QueryMain {
    private static final Logger logger = LogManager.getLogger(QueryMain.class);

    public static QueryBuilder createQuery() {
        return QueryBuilders.queryStringQuery("Beijing");
    }

    public static void main(String[] args) {
        try {
            ESConfig esConfig = new ESConfig()
                    .setEsClusterName("elasticsearch")
                    .setEsClusterAddress("127.0.0.1:9300")
                    .setEsIndex("person")
                    .setEsType("infos");

            // 创建客户端
            Client client = new ESClient().getElasticsearchClient(esConfig);
            // 查询
            SearchResponse response = client.prepareSearch().setQuery(createQuery()).execute().actionGet();
            // 返回结果
            SearchHits hits = response.getHits();
            for (SearchHit hit : hits) {
                System.out.println(hit.getSourceAsString());
            }
        } catch (Exception e) {
            logger.error("exception:", e);
        }
    }
}

返回结果：

{"pid":93,"age":28,"sex":true,"name":"Lily","addr":"Beijing"}
{"pid":168,"age":16,"sex":false,"name":"Tom","addr":"Beijing"}
{"pid":214,"age":35,"sex":false,"name":"Tom","addr":"Beijing"}
{"pid":226,"age":77,"sex":true,"name":"Jenny","addr":"Beijing"}
{"pid":276,"age":19,"sex":false,"name":"Bill","addr":"Beijing"}
{"pid":384,"age":62,"sex":false,"name":"Brown","addr":"Beijing"}
{"pid":459,"age":69,"sex":true,"name":"Jenny","addr":"Beijing"}
{"pid":531,"age":38,"sex":false,"name":"Brown","addr":"Beijing"}
{"pid":536,"age":77,"sex":true,"name":"Lily","addr":"Beijing"}
{"pid":574,"age":59,"sex":true,"name":"Lily","addr":"Beijing"}

2、按字段条件查询

如果需要查询(addr = Beijing) && (sex = false) && (10 < age < 20)的doc：

    public static QueryBuilder createQuery() {
        BoolQueryBuilder query = QueryBuilders.boolQuery();
        // addr = Beijing
        query.must(new QueryStringQueryBuilder("Beijing").field("addr"));
        // sex = falese
        query.must(new QueryStringQueryBuilder("false").field("sex"));
        // age ∈ (10, 20)
        query.must(new RangeQueryBuilder("age").gt(10).lt(20));
        return query;
    }

返回结果：

{"pid":168,"age":16,"sex":false,"name":"Tom","addr":"Beijing"}
{"pid":276,"age":19,"sex":false,"name":"Bill","addr":"Beijing"}
{"pid":565,"age":16,"sex":false,"name":"Brown","addr":"Beijing"}
{"pid":73,"age":13,"sex":false,"name":"David","addr":"Beijing"}

3、查询API

3.1 基本查询

QueryBuilder query = QueryBuilders.matchPhraseQuery("addr", "Beijing");

只要doc字段中含有Beijing的短语都会返回。

3.2 多词条查询

QueryBuilder query = QueryBuilders.termsQuery("addr", "Beijing", "Shanghai");

Beijing、Shanghai在addr字段中进行查询，只要满足一个就会返回。但是，并不会返回二者的并集。

3.3 matchAll查询

QueryBuilder query = QueryBuilders.matchAllQuery();

3.4 常用词查询

QueryBuilder query = QueryBuilders.commonTermsQuery("addr", "Beijing");

3.5 multiMatch查询

QueryBuilder query = QueryBuilders.multiMatchQuery("Beijing", "addr", "name");

在addr、name字段中查找关键字为Beijing的doc。

3.6 queryString查询

QueryBuilder query = QueryBuilders.queryStringQuery("Beijing");

3.7 simpleQueryString查询

QueryBuilder query = QueryBuilders.simpleQueryStringQuery("Beijing");

3.8 前缀查询

QueryBuilder query = QueryBuilders.prefixQuery("addr", "Bei");

3.9 模糊查询

QueryBuilder query = QueryBuilders.fuzzyQuery("addr", "BeiJing");

3.10 通配符查询

QueryBuilder query = QueryBuilders.wildcardQuery("addr", "Bei*");

3.11 Range查询

// 闭区间
QueryBuilder query = QueryBuilders.rangeQuery("age").from(10).to(20);
// 开区间
QueryBuilder query = QueryBuilders.rangeQuery("age").gt(10).lt(20);

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作者：唐影若凡
链接：https://www.jianshu.com/p/a3694b13bf89
來源：简书
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