我使用的是带有.net4的lucene.net 2.9.2.2版本。我在找"以"结尾的查询以及路径。如果发生在两者之间。
索引路径:
C:Usersvjfolder1lucene
C:Usersvjfolder1lucenefolder1folder2
C:Usersvjfolder2lucene2folder1lucene
索引代码:
new Field("PATH", strPath, Field.Store.YES, Field.Index.NOT_ANALYZED));
//Standard Analyzer
Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_29);
var writer = new IndexWriter(directory, analyzer, true, IndexWriter.MaxFieldLength.LIMITED);
搜索代码:
Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_29);
var queryParser = new QueryParser(Version.LUCENE_29, "PATH", analyzer);
var query = queryParser.Parse(strPath);
搜索查询:folder1lucene
预期结果:
C:Usersvjfolder1lucene
C:Usersvjfolder2lucene2folder1lucene
如何获得以上结果。我在SO上看到了许多关于相同的但没有一个包含工作代码。
这里有一个示例程序,它提供了您想要的输出。
需要注意的事项:
- QueryParser默认情况下不允许使用前导通配符(出于性能原因)
- 未分析字段"Path",因此未使用传递给IndexWriter的分析器
- StandardAnalyzer去掉了反斜杠,因此程序使用的是保持反斜杠不变的WhitespaceAnalyzer
- 将Backsplash传递给QueryParser时,需要对其进行转义
希望这对你有帮助。
using System;
using Lucene.Net.Analysis;
using Lucene.Net.Analysis.Standard;
using Lucene.Net.Documents;
using Lucene.Net.Index;
using Lucene.Net.QueryParsers;
using Lucene.Net.Search;
using Lucene.Net.Store;
namespace TestProgram
{
class Program
{
static void Main(string[] args)
{
FSDirectory directory = FSDirectory.Open(@"c:tempmyindex");
BuildIndex(directory);
QueryIndex(directory);
}
static void BuildIndex(Directory directory)
{
string[] paths = new[]
{
@"C:Usersvjfolder1lucene",
@"C:Usersvjfolder1lucenefolder1folder2",
@"C:Usersvjfolder2lucene2folder1lucene"
};
Analyzer analyzer = new WhitespaceAnalyzer();
using (var writer = new IndexWriter(directory, analyzer, true, IndexWriter.MaxFieldLength.LIMITED))
{
foreach (string path in paths)
{
Document doc = new Document();
var field = new Field("Path", path, Field.Store.YES, Field.Index.NOT_ANALYZED);
doc.Add(field);
writer.AddDocument(doc);
}
}
}
private static void QueryIndex(Directory directory)
{
string userQueryString = @"folder1lucene";
Analyzer analyzer = new WhitespaceAnalyzer();
var queryParser = new QueryParser(Lucene.Net.Util.Version.LUCENE_29, "Path", analyzer);
queryParser.AllowLeadingWildcard = true;
string queryString = "*" + userQueryString.Replace(@"", @"\");
var query = queryParser.Parse(queryString);
IndexSearcher searcher = new IndexSearcher(directory);
IndexReader reader = searcher.IndexReader;
TopDocs topDocs = searcher.Search(query, 100);
foreach (ScoreDoc doc in topDocs.ScoreDocs)
{
string path = reader.Document(doc.Doc).Get("Path");
Console.WriteLine(path);
}
Console.ReadKey();
}
}
}