AND搜索返回或結果在Lucene .net

Question

當我搜索'雞湯'。我得到的結果包含'雞肉'，'湯'或他們兩個。

我曾嘗試以下搜索查詢，他們都返回相同的結果：

• "chicken"AND"soup"
• +chicken +soup

這裏是我使用的代碼，請大家幫忙：

private DataTable SearchDishName(string textSearch) 
{ 
    string MatchingCutomisationIDs = "0"; //There is no Dish with ID zero, this is just to easen the coding.. 
    var ds = new DataSet(); 
    ds.ReadXml(System.Web.HttpContext.Current.Server.MapPath("~/App_data/MyDataset.xml")); 
    DataTable Sample = new DataTable(); 
    Sample = ds.Tables[0]; 
    var table = Sample.Clone(); 
    var Index = createIndex(Sample); 
    using (var reader = IndexReader.Open(Index, true)) 
    using (var searcher = new IndexSearcher(reader)) 
    { 
     using (Analyzer analyzer = new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30)) 
     { 
      var queryParser = new QueryParser(Lucene.Net.Util.Version.LUCENE_30, "DishName", analyzer); 
      var collector = TopScoreDocCollector.Create(1000, true); 
      try 
      { 
       var query = queryParser.Parse(textSearch); 
       searcher.Search(query, collector); 
      } 
      catch 
      { } 
      var matches = collector.TopDocs().ScoreDocs; 
      foreach (var item in matches) 
      { 
       var id = item.Doc; 
       var doc = searcher.Doc(id); 
       var row = table.NewRow(); 
       row["CustomisationID"] = doc.GetField("CustomisationID").StringValue; 
       table.Rows.Add(row); 
      } 
     } 
    } 
    return table; 
} 

Directory createIndex(DataTable table) 
{ 
    var directory = new RAMDirectory(); 

    using (Analyzer analyzer = new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30)) 
    using (var writer = new IndexWriter(directory, analyzer, new IndexWriter.MaxFieldLength(1000))) 
    { 
     foreach (DataRow row in table.Rows) 
     { 
      var document = new Document(); 
      document.Add(new Field("DishName", row["YouTubeTitle"].ToString(), Field.Store.YES, Field.Index.ANALYZED)); 
      document.Add(new Field("CustomisationID", row["CustomisationID"].ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED)); 

      writer.AddDocument(document); 
     } 

     writer.Optimize(); 
     writer.Flush(true, true, true); 
    } 
    return directory; 
} 

Answer 1

你的代碼看起來不錯，應該工作。我將它重構成一個完整的測試（綠色）。 AND查詢的幾個不同版本都只是返回一個正確的文檔。無法看到與您的代碼有很大區別。也許你可以看到與你將樣品取出的位置有所不同？

[TestClass] 
public class UnitTest3 
{ 
    [TestMethod] 
    public void TestLucene() 
    { 
     var writer = CreateIndex(); 
     AddDish(writer, "chicken soup", "1"); 
     AddDish(writer, "veg soup", "2"); 
     AddDish(writer, "chicken balti", "3"); 
     writer.Flush(true, true, true); 
     Assert.AreEqual(3, writer.NumDocs()); 

     var searcher = new IndexSearcher(writer.GetReader()); 
     Search(searcher, "chicken AND soup"); 
     Search(searcher, "\"chicken\" AND \"soup\""); 
     Search(searcher, "+chicken +soup"); 

     writer.Dispose(); 
    } 

    private void Search(IndexSearcher searcher, string query) 
    { 
     var result = SearchDishName(searcher, query); 
     Console.WriteLine(string.Join(", ", result)); 
     Assert.AreEqual(1, result.Count); 
     Assert.AreEqual("1", result[0]); 
    } 

    private List<string> SearchDishName(IndexSearcher searcher, string textSearch) 
    { 
     using (var analyzer = new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30)) 
     { 
      var queryParser = new QueryParser(Lucene.Net.Util.Version.LUCENE_30, "DishName", analyzer); 
      var collector = TopScoreDocCollector.Create(1000, true); 
      var query = queryParser.Parse(textSearch); 
      searcher.Search(query, collector); 

      var result = new List<string>(); 
      var matches = collector.TopDocs().ScoreDocs; 
      foreach (var item in matches) 
      { 
       var id = item.Doc; 
       var doc = searcher.Doc(id); 
       result.Add(doc.GetField("CustomisationID").StringValue); 
      } 
      return result; 
     } 
    } 

    IndexWriter CreateIndex() 
    { 
     var directory = new RAMDirectory(); 

     var analyzer = new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30); 
     var writer = new IndexWriter(directory, analyzer, new IndexWriter.MaxFieldLength(1000)); 

     return writer; 
    } 
    void AddDish(IndexWriter writer, string dishname, string id) 
    { 
     var document = new Document(); 
     document.Add(new Field("DishName", dishname, Field.Store.YES, Field.Index.ANALYZED)); 
     document.Add(new Field("CustomisationID", id, Field.Store.YES, Field.Index.NOT_ANALYZED)); 

     writer.AddDocument(document); 
    } 
}