LiteDBDirectory

A Lucene.net Directory to store the Lucene.net index files in a LiteDB database to secure the indexed data with a LiteDb password connection. The base implementation is taken from LuceneNetSqlDirectory and converted for LiteDb.

The solution is only for desktop and small ASP.NET applications. For large applications hosted on webfarms, it is recommended to use LuceneNetSqlDirectory.

Nuget Package

Install-Package LuceneLiteDbDirectory

Using LiteDbDirectory

Initializing LiteDbDirectory

string connectionString = $"Filename={Path.Combine(Environment.CurrentDirectory, "MyIndex.Db")};password=somepassword;";

using (var db = new LiteDatabase(connectionString))
{
    LiteDbDirectory liteDbDirectory = new LiteDbDirectory(db);
    try
    {
        liteDbDirectory.CheckRequiredCollection();
    }
    catch (ConfigurationErrorsException e)
    {
        LiteDbDirectory.CreateRequiredCollections(db, dropExisting: true);
    }
}

Using LiteDbDirectory for indexing data

using Lucene.Net.Analysis.Standard;
using Lucene.Net.Documents;
using Lucene.Net.Index;
using Lucene.Net.Store.LiteDbDirectory;
/* Indexing code */
using (var db = new LiteDatabase(connectionString))
{
	var indexWriter = new IndexWriter(directory, new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30),
		!IndexReader.IndexExists(directory),
		new IndexWriter.MaxFieldLength(IndexWriter.DEFAULT_MAX_FIELD_LENGTH));

	indexWriter.SetRAMBufferSizeMB(500);

	var bookPages = _libraryService.GetAllBookPages();  // You service layer to load data

	foreach(var page in bookPages)
	{
		var bookPageDoc = new Document();
		doc.Add(new Field("id", page.Id, Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.NO));
		doc.Add(new Field("book-title", page.Title, Field.Store.NO, Field.Index.ANALYZED, Field.TermVector.NO));
		doc.Add(new Field("book-page", page.Text, Field.Store.NO, Field.Index.ANALYZED, Field.TermVector.NO));
			
		indexWriter.AddDocument(bookPageDoc);
	}
	indexWriter.Flush(true, true, true);
	indexWriter.Commit();
	indexWriter.Dispose();
}

Using LiteDbDirectory for Searching data

using Lucene.Net.Analysis.Standard;
using Lucene.Net.Documents;
using Lucene.Net.Index;
using Lucene.Net.Store.LiteDbDirectory;
/* searching code */
using (var db = new LiteDatabase(connectionString))
{
	LiteDbDirectory liteDbDirectory = new LiteDbDirectory(db);
    
	IndexSearcher searcher = new IndexSearcher(liteDbDirectory);
	var parser = new QueryParser(Lucene.Net.Util.Version.LUCENE_30, "book-page", new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30));
	var query = parser.Parse("text to search");
	hits = searcher.Search(query, 100);

	Console.WriteLine("Found {0} results for {1}", hits.TotalHits, phrase);
	foreach (var hitsScoreDoc in hits.ScoreDocs)
	{
	  var doc = searcher.IndexReader[hitsScoreDoc.Doc];
	  Console.WriteLine("Book id: {0}", doc.GetValues("id")[0]);
	}
}