c# - 如何在 Lucene.NET 中使用运算符组合术语查询和数字查询？

Question

我尝试了以下方法来组合查询，但我不知道如何在这些查询中添加 (AND,OR,NOT) 运算符。

BooleanQuery booleanQuery = new BooleanQuery();
Query query1 = new TermQuery(new Term("Skill_Summary", "Java"));
Query pageQueryRange = NumericRangeQuery.NewIntRange("Experience", 1, 2, true, true);
booleanQuery.Add(query1, BooleanClause.Occur.MUST);
booleanQuery.Add(pageQueryRange, BooleanClause.Occur.MUST);
var hits = searcher.Search(booleanQuery);

上面的结果booleanQuery还是+Skill_Summary:Java +Experience:[1 TO 2]没有得到结果

String termQueryString = "Skill_Summary:\"Java\"";
Query termQuery = queryParser.Parse(termQueryString);
Query QueryRange = NumericRangeQuery.NewIntRange("Experience", 1, 3, true, true);
Query query = termQuery.Combine(new Query[] { termQuery, QueryRange });
var hits = searcher.Search(query);

Answer 1

使用 Lucene.NET实现和功能的最简单方法AND是OR使用NOT类组合查询BooleanQuery。当您将查询添加到 booleanQuery 时，您可以使用Occur参数来指定应如何处理查询，

var termQuery = new TermQuery(new Term("Skill_Summary", "Java"));
var booleanQuery = new BooleanQuery();

// Use 'Occur.MUST` to simulate an AND, or '+Skill_Summary:Java'
booleanQuery.Add(termQuery, Occur.MUST);

// Use 'Occur.SHOULD` to simulate an OR, or just 'Skill_Summary:Java'
booleanQuery.Add(termQuery, Occur.SHOULD);

// Use 'Occur.MUST_NOT` to simulate a NOT, or just '-Skill_Summary:Java'
booleanQuery.Add(termQuery, Occur.MUST_NOT);

在您的示例中，您可能会发现TermQuery尝试按字面意思匹配该值，因此它不会匹配“java”或“Java”之类的值。为此，您需要这样做，

var booleanQuery = new BooleanQuery();

// Use QueryParser
var query1 = new QueryParser(version, "Skill_Summary", analyzer).Parse("Java");
var pageQueryRange = NumericRangeQuery.NewIntRange("Experience", 1, 2, true, true);
booleanQuery.Add(query1, BooleanClause.Occur.MUST);
booleanQuery.Add(pageQueryRange, BooleanClause.Occur.MUST);
var hits = searcher.Search(booleanQuery);