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[英]How to search a Field.Index.NOT_ANALYZED field in Lucene.NET?
[英]Lucene.net Field contains mutiple values and who to search
有人知道最好的方法是在具有多個值的字段上進行搜索嗎?
string tagString = "";
foreach(var tag in tags)
{
tagString = tagString += ":" + tag;
}
doc.Field(new Field("Tags", tagString, Field.Store.YES, Field.Index.Analyzed);
假設我要搜索所有帶有標簽“ csharp”的文檔,誰能最好地實現這一點?
我認為您正在尋找的是將多個具有相同名稱的字段添加到單個Document
。
您要做的是創建一個Document
並向其中添加多個標簽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
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