Lucene.net字段包含多個值和搜索對象

Question

任何人都知道什麼最好的方法是在一個字段上搜索多個值？

string tagString = ""; 
foreach(var tag in tags) 
{ 
    tagString = tagString += ":" + tag; 
} 
doc.Field(new Field("Tags", tagString, Field.Store.YES, Field.Index.Analyzed); 

比方說，我想搜索所有具有標籤「csharp」的文檔，誰能最好地實現它？

Answer 1

我認爲你要找的是將多個同名的字段添加到一個Document。

你要做的是創建一個Document併爲其添加多個標籤Field。

RAMDirectory ramDir = new RAMDirectory(); 

IndexWriter writer = new IndexWriter(ramDir, new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_29)); 


Document doc = new Document(); 
Field tags = null; 

string [] articleTags = new string[] {"C#", "WPF", "Lucene" }; 
foreach (string tag in articleTags) 
{ 
    // adds a field with same name multiple times to the same document 
    tags = new Field("tags", tag, Field.Store.YES, Field.Index.NOT_ANALYZED); 
    doc.Add(tags); 
} 

writer.AddDocument(doc); 
writer.Commit(); 

// search 
IndexReader reader = writer.GetReader(); 
IndexSearcher searcher = new IndexSearcher(reader); 

// use an analyzer that treats the tags field as a Keyword (Not Analyzed) 
PerFieldAnalyzerWrapper aw = new PerFieldAnalyzerWrapper(new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_29)); 
aw.AddAnalyzer("tags", new KeywordAnalyzer()); 

QueryParser qp = new QueryParser(Lucene.Net.Util.Version.LUCENE_29, "tags", aw); 

Query q = qp.Parse("+WPF +Lucene"); 
TopDocs docs = searcher.Search(q, null, 100); 
Console.WriteLine(docs.totalHits); // 1 hit 

q = qp.Parse("+WCF +Lucene"); 
docs = searcher.Search(q, null, 100); 
Console.WriteLine(docs.totalHits); // 0 hit