Comments on: Getting started with Lucene 2.0 â€“ A powerful java search engine

By: Leigh

Leigh — Wed, 16 Jan 2008 15:02:09 +0000

In the code section where you are creating the index, you left out the step where you add the document to the IndexModifier. Should be: im.addDoc(d);

Great intro to Lucene 2.2.0. Thanks!

By: Abin Thomas

Abin Thomas — Wed, 25 Jul 2007 09:48:01 +0000

Very nicely written… Thanks a lot!!

By: Jeroen van Wilgenburg

Jeroen van Wilgenburg — Mon, 24 Jul 2006 09:03:01 +0000

Thanks for pointing the AND thing out, I have changed it. I once made a very stupid typo in a query in google and it still returned results, so I assumed it was OR search. But apperently the typo wasn’t that stupid.

What you can do for implicit AND-search is put a + before every search term if there isn’t a – or a + yet. Lucene rewrites the query internally to the +/- format (so pulp AND fiction becomes +pulp +fiction internally), the query object you get after invoking queryParser.parse() displays the rewritten query (it’s just the toString method). You can see the rewrtitten query in Luke just under the search box. And then you have to built in a check to see whether a user used OR in his original query. I think this is all that needs to be done, I might have overlooked something.

I have to check if it can be done via some setting, but as far as I can remember it isn’t possible.

By: Alper

Alper — Mon, 24 Jul 2006 00:08:48 +0000

From experience I know search based on OR is completely useless.

Google does not OR their searches -as you say- AND is implicit. From the Google website: “The “AND” operator is unnecessary — we include all search terms by default.”

Is it possible to make Lucene see AND as implicit? Do you have to rewrite the query parser or is there a setting you can set?