I tried but its returning a null value whenever I printed any of the field that was not used for the search query. Index for all the files contained in a directory.Hello I'm new to lucene I want to write a demo program that index a group of fields having a unique field, then been able to search on any of the fields.
Using apache lucene code#
Some simple examples of code which does this are: Which implements files as memory-resident data structures.Ĭontains a few handy data structures and util classes, ie OpenBitSetĪnd add documents to it with AddDocument() Which uses a file system directory to store files, and RAMDirectory Multiple implementations are provided, including FSDirectory, Which is a collection of named files written by an IndexOutput Provides data structures to represent queries (ie TermQueryįor boolean combinations of queries) and the IndexSearcherĪ number of QueryParsers are provided for producingĭefines an abstract class for storing persistent data, the Directory, Which creates and adds documents to indices and IndexReader, Provides two primary classes: IndexWriter, Whose values may be strings or instances of. A Document is simply a set of named Fields, Provides an abstraction over the encoding and decoding of the inverted index structure,Īs well as different implementations that can be chosen depending upon application needs.Ĭlass. provides a number of Analyzer implementations, including Tokenizers and TokenFilters are strung together and applied with an Analyzer. The Lucene API is divided into several packages:ĪPI for converting text from a Ī TokenStream can be composed by applying TokenFilters ScoreDoc hits = isearcher.Search(query, null, 1000).ScoreDocs ĭocument hitDoc = isearcher.Doc(hits.Doc) Īssert.AreEqual("This is the text to be indexed.", hitDoc.Get("fieldname")) QueryParser parser = new QueryParser(LuceneVersion.LUCENE_CURRENT, "fieldname", analyzer) Parse a simple query that searches for "text": IndexSearcher isearcher = new IndexSearcher(ireader) Using DirectoryReader ireader = DirectoryReader.Open(directory) The beta version is extremely stable Has more than 7800+ passing unit tests Integrates well with. String text = "This is the text to be indexed." ĭoc.Add(new Field("fieldname", text, TextField.TYPE_STORED)) Lucene.Net is a port of the Lucene search library, written in C and targeted at. Using IndexWriter iwriter = new IndexWriter(directory, config)
IndexWriterConfig config = new IndexWriterConfig(LuceneVersion.LUCENE_CURRENT, analyzer) Directory directory = FSDirectory.Open(indexPath) The Lucene command-line demo code consists of an application that demonstrates various functionalities of Lucene and how you can add Lucene to your applications. It walks you through some basic installation and configuration. var indexPath = Path.Combine(basePath, "index") This document is intended as a 'getting started' guide to using and running the Lucene demos.
var basePath = Environment.GetFolderPath() Construct a machine-independent path for the index To store an index on disk, use this instead:
Using apache lucene how to#
Here's a simple example how to use Lucene.NET for indexing and searching (using NUnit to check if the results are what we expect): Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT) ĭirectory directory = new RAMDirectory() Apache Lucene.NET is a high-performance, full-featured text search engine library.
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