Lucene .NET搜索结果

我正在使用此代码进行索引：

public void IndexEmployees(IEnumerable employees) { var indexPath = GetIndexPath(); var directory = FSDirectory.Open(indexPath); var indexWriter = new IndexWriter(directory, new StandardAnalyzer(Version.LUCENE_29), true, IndexWriter.MaxFieldLength.UNLIMITED); foreach (var employee in employees) { var document = new Document(); document.Add(new Field("EmployeeId", employee.EmployeeId.ToString(), Field.Store.YES, Field.Index.NO, Field.TermVector.NO)); document.Add(new Field("Name", employee.FirstName + " " + employee.LastName, Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.NO)); document.Add(new Field("OfficeName", employee.OfficeName, Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.NO)); document.Add(new Field("CompetenceRatings", string.Join(" ", employee.CompetenceRatings.Select(cr => cr.Name)), Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.NO)); indexWriter.AddDocument(document); } indexWriter.Optimize(); indexWriter.Close(); var indexReader = IndexReader.Open(directory, true); var spell = new SpellChecker.Net.Search.Spell.SpellChecker(directory); spell.ClearIndex(); spell.IndexDictionary(new LuceneDictionary(indexReader, "Name")); spell.IndexDictionary(new LuceneDictionary(indexReader, "OfficeName")); spell.IndexDictionary(new LuceneDictionary(indexReader, "CompetenceRatings")); } public DirectoryInfo GetIndexPath() { return new DirectoryInfo(HttpContext.Current.Server.MapPath("/App_Data/EmployeeIndex/")); } 

并且此代码可以找到结果（以及建议）：

 public SearchResult Search(DirectoryInfo indexPath, string[] searchFields, string searchQuery) { var directory = FSDirectory.Open(indexPath); var standardAnalyzer = new StandardAnalyzer(Version.LUCENE_29); var indexReader = IndexReader.Open(directory, true); var indexSearcher = new IndexSearcher(indexReader); var parser = new MultiFieldQueryParser(Version.LUCENE_29, searchFields, standardAnalyzer); //parser.SetDefaultOperator(QueryParser.Operator.OR); var query = parser.Parse(searchQuery); var hits = indexSearcher.Search(query, null, 5000); return new SearchResult { Suggestions = FindSuggestions(indexPath, searchQuery), LuceneDocuments = hits .scoreDocs .Select(scoreDoc => indexSearcher.Doc(scoreDoc.doc)) .ToArray() }; } public string[] FindSuggestions(DirectoryInfo indexPath, string searchQuery) { var directory = FSDirectory.Open(indexPath); var spell = new SpellChecker.Net.Search.Spell.SpellChecker(directory); var similarWords = spell.SuggestSimilar(searchQuery, 20); return similarWords; } var searchResult = Search(GetIndexPath(), new[] { "Name", "OfficeName", "CompetenceRatings" }, "admin*"); 

简单的查询，例如：admin或admin *不会给我任何结果。 我知道有一名员工有这个名字。 如果我寻找詹姆斯，我希望能找到詹姆斯詹姆森。

谢谢！

Answer 1

第一件事。 您必须将更改提交到索引。

 indexWriter.Optimize(); indexWriter.Commit(); //Add This indexWriter.Close(); 

编辑＃2另外，保持简单直到你得到一些有用的东西。

评论这些东西。

 //var indexReader = IndexReader.Open(directory, true); //var spell = new SpellChecker.Net.Search.Spell.SpellChecker(directory); //spell.ClearIndex(); //spell.IndexDictionary(new LuceneDictionary(indexReader, "Name")); //spell.IndexDictionary(new LuceneDictionary(indexReader, "OfficeName")); //spell.IndexDictionary(new LuceneDictionary(indexReader, "CompetenceRatings")); 

编辑＃3

您正在搜索的字段可能不会经常更改。 我会将它们包含在您的搜索function中。

 string[] fields = new string[] { "Name", "OfficeName", "CompetenceRatings" }; 

我建议这个的最大原因是Fields是区分大小写的，有时你不会得到任何结果，这是因为你搜索“name”字段（不存在）而不是“Name”字段。 更容易以这种方式发现错误。

Answer 2

在我与Lucene合作的（有限）经验中，我发现你必须建立自己的查询才能获得“谷歌”般的行为。 这是我做的，YMMV，但它在我的应用程序中生成预期的结果。 基本思想是组合术语查询（完全匹配），前缀查询（以术语开头的任何内容），以及搜索字符串中每个术语的模糊查询。 下面的代码不会编译，但会给你一个想法

 Query GetQuery(string querystring) { Search.Search.BooleanQuery query = new Search.Search.BooleanQuery(); Search.Analysis.TokenStream tk = StandardAnalyzerInstance.TokenStream(null, new StringReader(querystring)); Search.Analysis.Tokenattributes.TermAttribute ta = tk.GetAttribute(typeof(Search.Analysis.Tokenattributes.TermAttribute)) as Search.Analysis.Tokenattributes.TermAttribute; while (tk.IncrementToken()) { string term = ta.Term(); Search.Search.BooleanQuery bq = new Search.Search.BooleanQuery(); bq.Add(new Search.Search.TermQuery(new Search.Index.Term("fieldToQuery", term)), Search.Search.BooleanClause.Occur.SHOULD); bq.Add(new Search.Search.PrefixQuery(new Search.Index.Term("fieldToQuery", term)), Search.Search.BooleanClause.Occur.SHOULD); bq.Add(new Search.Search.FuzzyQuery(new Search.Index.Term("fieldToQuery", term)), Search.Search.BooleanClause.Occur.SHOULD); query.Add(bq, Search.Search.BooleanClause.Occur.MUST); } return query; } 

Answer 3

Parse（）方法是inheritance的。 您是否尝试过使用返回Query对象的静态方法？

 Parse(Version matchVersion, String[] queries, String[] fields, Analyzer analyzer)