What is LINQ to Lucene?

Providing a custom LINQ solution for the Lucene Information Retrieval System, commonly referred to as a search-engine.

• Project Description
• Project Architecture
• Project Documentation
• Project Roadmap

Feedback
Your feedback and thoughts on LINQ to Lucene are vital to guiding the direction of this project. Please submit your feedback, feature suggestions and bugs into the Issue Tracker or Discussion Forum

Blog Posts
Here are some useful links that demonstrate the use of LINQ to Lucene:

• LINQ & Lambda, Part 4: Lucene.Net (cached post as author is still finding a new home)

Current Release
LinqToLucene v0.61
Monday, April 2, 2012
Azure Blob Support for both Lucene indexes and entities in binary files
Azure Tables Support for both Lucene indexes and entities in binary files

Older Release
LinqToLucene v0.6
Monday, March 26 2012
Much refactoring and... Azure Blob Support for both Lucene indexes and entities in binary files

Older Release
LinqToLucene v0.5
Sunday, March 24 2012

• Completed
  • Upgrade to .NET 4
  • Update to Lucene.Net 2.9.4
• Refactoring
  • Core Code
  • Unit Tests
• Optimizations
• A lot of code cleanup
• Ported unit tests to MS Test
• Removed dependency on MbUnit

Older Release
The Refactored Release
Tuesday, 22nd July 2008
A large set of library changes including an API analogous to LINQ to SQL, more supported LINQ methods, powerful LINQ to SQL Data Context support and more unit tests.


Older Release
The Re-Release
As promised, this release merges the features of previous releases into the one bundle.


Older Release
The Type-Conversion Release
Monday, 19 November 2007
TYPES BEYOND STRINGS NOW SUPPORTED
As promised (albeit out of order), support has been added for type-conversion. If the type of the indexed-property uses a type-converter that supports conversion from a string, the type will automatically convert to its appropriate type. This automatically inlcudes string, bool, int, datetime and a number of other .net types that already implement their own type-converters. Custom types can implement their own type-converters. For more information on type-converters please review either of the following article: MSDN: How to Implement a Type-Converter

Older Release
The Query Release
Tuesday, 13 November 2007
This release provides a real focus on the querying abilities of the LINQ to Lucene project and is the first real 'working release', converting LINQ statements to Lucene queries with deferred query execution and object creation or projection. It culminates the majority of the required querying features for LINQ that Lucene provides natively.

	Lucene Syntax	LINQ to Lucene
Terms & Phrases	"test" or "hello dolly"	c.Match("test") or c.Match("hello dolly")
Fields	title:"The Right way" and text:go	c.Title == "The Right way" or c.Text == "go"
WildCard	amb?r	c.ContactName.Match("amb?r")
Prefix	amber*	c.ContactName.StartsWith("amber")
Fuzzy	roam~ or roam~0.8	c.ContactName.Like("roam") or c.ContactName.Like("roam", 0.8)
Proximity	"jakarta apache"~10	c.ContactName.Like("jakarta apache", 10)
Inclusive Range	mod_date:[20020101 TO 20030101]	c.ModifiedDate.Includes("20020101", "20030101")
Exclusive Range	title:{Aida TO Carmen}	c.Title.Between("Aida", "Carmen")
Boosting	jakarta^4 apache	c.Title.Match("jakarta".Boost(4), apache)
Boolean Or	"jakarta apache" OR jakarta	where c.Match("jakarta apache") || c.Match("jakarta")
Boolean And	"jakarta apache" AND "Apache Lucene"	where c.Match("jakarta apache") && c.Match("Apache Lucene")
Boolean Not	"jakarta apache" NOT "Apache Lucene"	where c.Match("jakarta apache") && !c.Match("Apache Lucene")
Required	+jakarta lucene	c.Title.Match("jakarta".Require(), "lucene")
Grouping	(jakarta OR apache) AND website	where (c.Title == "jakarta" || c.Title == "apache") && (c.Title == "website")
Native Syntax	ie. title:{+return +"pink panther")	c.Search("title:(return +\"pink panther\"")

First Releases
A first release for generating a simple index out of a database for mapping types to Lucene using LINQ is now available.
This is the first small piece of the puzzle.

The Index Release

[Document]
public class Customer 
{
  [Field(Store=FieldStore.Yes, Index=FieldIndex.No)] public string CustomerID { get; set; }
  [Field(Store=FieldStore.Yes, Index=FieldIndex.Tokenized)] public string CustomerName { get; set; }
}

IndexContext index = new IndexContext;
index.WriteIndex<Customer>();