Lucene.Net我在做什麼錯了？

Question

我對lucene.net很新。我在C＃中編寫了這個簡單的控制檯應用程序，它索引了一些假數據。然後，我希望能夠使用booleanquery在索引中搜索各種術語。

我從來沒有得到任何結果。這是代碼。任何幫助將不勝感激。謝謝。

static void Main(string[] args) 
    { 
     StandardAnalyzer analyzer = new StandardAnalyzer(); 
     IndexWriter writer = new IndexWriter("Test", analyzer, true); 
     Console.WriteLine("Creating index"); 
     for (int i = 0; i < 1500; i++) 
     { 
      Lucene.Net.Documents.Document doc = new Lucene.Net.Documents.Document(); 
      doc.Add(new Lucene.Net.Documents.Field("A", i.ToString(), Lucene.Net.Documents.Field.Store.YES, Lucene.Net.Documents.Field.Index.NO)); 
      doc.Add(new Lucene.Net.Documents.Field("B", "LALA" + i.ToString(), Lucene.Net.Documents.Field.Store.YES, Lucene.Net.Documents.Field.Index.NO)); 
      doc.Add(new Lucene.Net.Documents.Field("C", "DODO" + i.ToString(), Lucene.Net.Documents.Field.Store.YES, Lucene.Net.Documents.Field.Index.NO)); 
      doc.Add(new Lucene.Net.Documents.Field("D", i.ToString() + " MMMMM", Lucene.Net.Documents.Field.Store.YES, Lucene.Net.Documents.Field.Index.NO)); 
      writer.AddDocument(doc); 
     }    
     writer.Optimize(); 
     writer.Close(); 

     BooleanQuery query = new BooleanQuery(); 
     query.Add(new WildcardQuery(new Term("B", "lala*")), Lucene.Net.Search.BooleanClause.Occur.MUST); 
     query.Add(new WildcardQuery(new Term("C", "DoDo1*")), Lucene.Net.Search.BooleanClause.Occur.MUST); 

     IndexSearcher searcher = new IndexSearcher("Test"); 
     Hits hits = searcher.Search(query); 
     if (hits.Length() > 0) 
     { 
      for (int i = 0; i < hits.Length(); i++) 
      { 
       Console.WriteLine("{0} - {1} - {2} - {3}", 
        hits.Doc(i).GetField("A").StringValue(), 
        hits.Doc(i).GetField("B").StringValue(), 
        hits.Doc(i).GetField("C").StringValue(), 
        hits.Doc(i).GetField("D").StringValue()); 
      } 
     } 
     searcher.Close(); 

     Console.WriteLine("Done"); 

     Console.ReadLine(); 
    } 

然後我得到了它使用MultiFieldQueryParser像這樣的工作：

static void Main(string[] args) 
    { 
     StandardAnalyzer analyzer = new StandardAnalyzer();    

     IndexWriter writer = new IndexWriter("Test", analyzer, true); 
     Console.WriteLine("Creating index"); 
     for (int i = 0; i < 1500; i++) 
     { 
      Lucene.Net.Documents.Document doc = new Lucene.Net.Documents.Document(); 
      doc.Add(new Lucene.Net.Documents.Field("A", i.ToString(), Lucene.Net.Documents.Field.Store.YES, Lucene.Net.Documents.Field.Index.TOKENIZED)); 
      doc.Add(new Lucene.Net.Documents.Field("B", "LALA" + i.ToString(), Lucene.Net.Documents.Field.Store.YES, Lucene.Net.Documents.Field.Index.TOKENIZED)); 
      doc.Add(new Lucene.Net.Documents.Field("C", "DODO" + i.ToString(), Lucene.Net.Documents.Field.Store.YES, Lucene.Net.Documents.Field.Index.TOKENIZED)); 
      doc.Add(new Lucene.Net.Documents.Field("D", i.ToString() + " MMMMM", Lucene.Net.Documents.Field.Store.YES, Lucene.Net.Documents.Field.Index.TOKENIZED)); 
      writer.AddDocument(doc); 
     }    
     writer.Optimize(); 
     writer.Close();    

     BooleanQuery.SetMaxClauseCount(5000); 
     Query query = MultiFieldQueryParser.Parse(new string[] { "LALA*", "DODO*" }, new string[] { "B", "C" }, analyzer); 

     IndexSearcher searcher = new IndexSearcher("Test"); 
     Hits hits = searcher.Search(query); 
     if (hits.Length() > 0) 
     { 
      for (int i = 0; i < hits.Length(); i++) 
      { 
       Console.WriteLine("{0} - {1} - {2} - {3}", 
        hits.Doc(i).GetField("A").StringValue(), 
        hits.Doc(i).GetField("B").StringValue(), 
        hits.Doc(i).GetField("C").StringValue(), 
        hits.Doc(i).GetField("D").StringValue()); 
      } 
     } 
     searcher.Close(); 

     Console.WriteLine("Done"); 

     Console.ReadLine(); 
    } 

這可能是我發現任何新的Lucene的開發者最好的文章：http://www.ifdefined.com/blog/post/2009/02/Full-Text-Search-in-ASPNET-using-LuceneNET.aspx

Answer 1

我想有在構建索引時是個問題。您爲每個文檔添加四個字段，所有這些字段都存儲，但沒有索引（=> Lucene.Net.Documents.Field.Index.NO）。你應該至少在現場索引。

請注意StandardAnalyzer通過以下方式標記每個字段索引：使用普通英語停用詞進行縮小和分割。因此，在構建查詢時，請使用LOWERCASE前綴以獲得點擊數：

query.Add(new PrefixQuery(new Term("B", "lala")), BooleanClause.Occur.MUST); 
query.Add(new PrefixQuery(new Term("C", "dodo")), BooleanClause.Occur.MUST);