Lucene.net字段包含多个值以及要搜索的人员

Question

任何人都知道搜索包含多个值的字段的最佳方法是什么？

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

假设我想搜索所有标记为"csharp"的文档,谁能最好地实现它？

Answer 1

我认为您正在寻找的是将多个具有相同名称的字段添加到单个字段中Document.

您所做的是创建一个Document并向其添加多个标记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