Elasticsearch 数据查询
Posted heqiuyong
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一、基本查询
语法：
GET /索引库名/_search { "query": { "查询类型": { "查询条件": "查询条件值" } } }
查询类型：match_all，match，term，range，fuzzy，bool 等等
查询条件：查询条件会根据类型的不同，写法也有差异
1.1 查询所有（match_all）
查询指令：
GET /demo/_search { "query": { "match_all": {} } }
查询结果：
{ "took": 5, "timed_out": false, "_shards": { "total": 3, "successful": 3, "skipped": 0, "failed": 0 }, "hits": { "total": 4, "max_score": 1, "hits": [ { "_index": "demo", "_type": "goods", "_id": "LoHLs2gBBdkQnU_dAr4j", "_score": 1, "_source": { "title": "联想笔记本", "price": "5299.00" } }, { "_index": "demo", "_type": "goods", "_id": "MIHNs2gBBdkQnU_d_r6o", "_score": 1, "_source": { "title": "华为手机", "price": "2199.00" } }, { "_index": "demo", "_type": "goods", "_id": "L4HNs2gBBdkQnU_dXL4O", "_score": 1, "_source": { "title": "普联路由器", "price": "99.00" } }, { "_index": "demo", "_type": "goods", "_id": "LYHJs2gBBdkQnU_dt75n", "_score": 1, "_source": { "title": "小米手机", "price": "1699.00" } } ] } }
1.2 匹配查询（match）
or 关系：会把查询条件进行分词，然后进行查询，多个词条之间是or的关系
查询指令：
GET /demo/_search { "query": { "match": { "title": { "query": "华为手机", "operator": "or" } } } }
查询结果：
{ "took": 3, "timed_out": false, "_shards": { "total": 3, "successful": 3, "skipped": 0, "failed": 0 }, "hits": { "total": 2, "max_score": 1.6051829, "hits": [ { "_index": "demo", "_type": "goods", "_id": "MIHNs2gBBdkQnU_d_r6o", "_score": 1.6051829, "_source": { "title": "华为手机", "price": "2199.00" } }, { "_index": "demo", "_type": "goods", "_id": "LYHJs2gBBdkQnU_dt75n", "_score": 0.2876821, "_source": { "title": "小米手机", "price": "1699.00" } } ] } }
and关系：会把查询条件进行分词，然后进行查询,多个词条之间是and的关系
查询指令：
GET /demo/_search { "query": { "match": { "title": { "query": "华为手机", "operator": "and" } } } }
查询结果：
{ "took": 6, "timed_out": false, "_shards": { "total": 3, "successful": 3, "skipped": 0, "failed": 0 }, "hits": { "total": 1, "max_score": 1.6051829, "hits": [ { "_index": "demo", "_type": "goods", "_id": "MIHNs2gBBdkQnU_d_r6o", "_score": 1.6051829, "_source": { "title": "华为手机", "price": "2199.00" } } ] } }
1.3 词条查询（term）
查询指令：
GET /demo/_search { "query": { "term": { "price": { "value": 5299.00 } } } }
查询结果：
{ "took": 11, "timed_out": false, "_shards": { "total": 3, "successful": 3, "skipped": 0, "failed": 0 }, "hits": { "total": 1, "max_score": 1, "hits": [ { "_index": "demo", "_type": "goods", "_id": "LoHLs2gBBdkQnU_dAr4j", "_score": 1, "_source": { "title": "联想笔记本", "price": "5299.00" } } ] } }
二、结果过滤
默认情况下，elasticsearch在搜索的结果中，会把文档中保存在 _source 的所有字段都返回。
如果我们只想获取其中的部分字段，我们可以添加 _source 字段进行过滤
查询指令：
GET /demo/_search { "query": { "match_all": {} }, "_source": { "includes": ["title"], "excludes": ["price"] } }
查询结果：
{ "took": 7, "timed_out": false, "_shards": { "total": 3, "successful": 3, "skipped": 0, "failed": 0 }, "hits": { "total": 4, "max_score": 1, "hits": [ { "_index": "demo", "_type": "goods", "_id": "LoHLs2gBBdkQnU_dAr4j", "_score": 1, "_source": { "title": "联想笔记本" } }, { "_index": "demo", "_type": "goods", "_id": "MIHNs2gBBdkQnU_d_r6o", "_score": 1, "_source": { "title": "华为手机" } }, { "_index": "demo", "_type": "goods", "_id": "L4HNs2gBBdkQnU_dXL4O", "_score": 1, "_source": { "title": "普联路由器" } }, { "_index": "demo", "_type": "goods", "_id": "LYHJs2gBBdkQnU_dt75n", "_score": 1, "_source": { "title": "小米手机" } } ] } }
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