ES 数据库
- 通过 API 查询
- 通过 JSON 查询
熟悉 es 的同学都知道 es 一般有两种查询方式
1,在 java 中构建查询对象,调用 es 提供的 api 做查询
2,使用 json 调用接口做查询
查询语句无非是将足够的信息丢给数据库,但是它却和 SQL 不一样有自己独立的查询方式
通过 API 查询
模糊查询
BoolQueryBuilder boolBuilder = QueryBuilders.boolQuery();//Elasticsearch 中文会把汉字分词,“王大”会匹配到like“王”和like“大”,要在字段后面接keyword
boolBuilder.must(QueryBuilders.wildcardQuery("userName.keyword","*王大*"));
等于、不等于
BoolQueryBuilder boolBuilder = QueryBuilders.boolQuery();
//等于 must
boolBuilder.must(QueryBuilders.termQuery("age","30"));
//不等于 mustNot
boolBuilder.mustNot(QueryBuilders.termQuery("sex","1"));
大于、小于
BoolQueryBuilder boolBuilder = QueryBuilders.boolQuery();
//大于
boolBuilder.must(QueryBuilders.rangeQuery("createTime").gt(1609430400000));
//小于
boolBuilder.must(QueryBuilders.rangeQuery("createTime").lt(1672502400000));
es 也是有层级的,下面演示 and 、or 同时使用
BoolQueryBuilder boolBuilder = QueryBuilders.boolQuery();boolBuilder.must(QueryBuilders.termQuery("a",1));QueryBuilder queryBuilder1 = QueryBuilders.boolQuery().must(QueryBuilders.termQuery("b", 2)).must(QueryBuilders.termQuery("c", 3)).mustNot(QueryBuilders.termQuery("d", 4));QueryBuilder queryBuilder2 = QueryBuilders.boolQuery().must(QueryBuilders.termQuery("e", 4)).must(QueryBuilders.termQuery("f", 5));QueryBuilder queryBuilder = QueryBuilders.boolQuery().should(queryBuilder1).should(queryBuilder2);boolBuilder.must(queryBuilder);
等同与这个 sql
select * from user where a=1 and ((b=2 and c=3 and d !=4) or (e=4 and f=5))
通过 JSON 查询
模糊查询
{"query": {"bool": {"adjust_pure_negative": true,"must": [{"wildcard": {"name": {"boost": 1.0,"wildcard": "*小李*"}}}],"boost": 1.0}}
}
等值查询,查询 name = 小李的数据
{"query": {"bool": {"adjust_pure_negative": true,"must": [{"term": {"name": {"boost": 1.0,"value": "小李"}}}],"boost": 1.0}}
}
范围查询,查询年龄大于等于18,并且小于等于50的数据
{"query": {"range": {"age": {"include_lower": true,"include_upper": true,"from": 18,"boost": 1.0,"to": 50}}}
}
多条件查询,查询姓名为小李,并且年龄在10-50之间的文档
{"query": {"bool": {"adjust_pure_negative": true,"must": [{"term": {"name": {"boost": 1.0,"value": "小李"}}},{"range": {"age": {"include_lower": true,"include_upper": true,"from": 10,"boost": 1.0,"to": 50}}}],"boost": 1.0}}
}