/// <summary>
/// Generates Exists query for Elasticsearch for the given article address.
/// </summary>
/// <param name="articleAddress">query will be generated for this article address</param>
/// <returns>Exists query for Elasticsearch</returns>
private ExistsQuery GetElasticExistsQuery(string articleAddress)
{
var elasticExistsQuery = new ExistsQuery()
{
Query = new Models.Elasticsearch.Existence.Query()
{
ConstantScore = new ConstantScore()
{
Filter = new Filter()
{
Term = new Term()
{
AddressKeyword = articleAddress
}
}
}
},
Source = new List <string>()
{
"Title",
"Address"
}
};
return(elasticExistsQuery);
}
static void DifferentQuerysInEs(QueryContainer qc)
{
//匹配查询
qc &= new MatchQuery()
{
Field = "analyized field name",
Query = "关键词",
Operator = Operator.Or,
MinimumShouldMatch = "100%",
Analyzer = "ik_smart"
};
//https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html#query-string-syntax
//https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-simple-query-string-query.html
//query string自定义了一个查询语法
var qsq = new QueryStringQuery()
{
};
//https://www.elastic.co/guide/cn/elasticsearch/guide/current/_wildcard_and_regexp_queries.html
//使用通配符查询，比如name.*
var wcq = new WildcardQuery()
{
};
//精准匹配，不分词
var tq = new TermQuery()
{
};
//字段存在且不为空
var eq = new ExistsQuery()
{
};
//https://www.elastic.co/guide/cn/elasticsearch/guide/current/fuzzy-query.html
//模糊查询，它会计算关键词和目标字段的“距离”。如果在允许的距离范围内，计算拼写错误也可以匹配到
var fq = new FuzzyQuery()
{
};
//范围查询
var drq = new DateRangeQuery()
{
};
var nrq = new NumericRangeQuery()
{
};
}
public void Exists_query_must_transform_correclty_to_ES()
{
var query = new ExistsQuery("type");
Assert.IsTrue(query.Field == "field");
Assert.IsTrue(query.Value.ToString() == "type");
string json = query.ToString();
var jo = JsonObject.Parse(json);
var q = jo.ToQuery();
Assert.IsTrue(q.Type == QueryType.ExistsQuery);
query = q as ExistsQuery;
Assert.IsTrue(query.Field == "field");
Assert.IsTrue(query.Value.ToString() == "type");
}
public override Task <IQueryNode> VisitAsync(TermNode node, IQueryVisitorContext context)
{
if (!String.Equals(node.Field, "fixed", StringComparison.OrdinalIgnoreCase))
{
return(Task.FromResult <IQueryNode>(node));
}
if (!Boolean.TryParse(node.Term, out bool isFixed))
{
return(Task.FromResult <IQueryNode>(node));
}
var query = new ExistsQuery {
Field = _dateFixedFieldName
};
node.SetQuery(isFixed ? query : !query);
return(Task.FromResult <IQueryNode>(node));
}
