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From "Alan Chandler" <>
Subject Re: Confused about boolean query and how an IndexReader is associated with Hits
Date Wed, 07 Dec 2005 14:56:10 GMT
Erik Hatcher writes: 

> On Dec 7, 2005, at 7:06 AM, Alan Chandler wrote: 
>> Erik Hatcher writes:
>>> On Dec 7, 2005, at 2:38 AM, Alan Chandler wrote:
>>>> Worse than that, when I attempt to access Hits.doc(0) I am  getting an
>>>> immediate IOException with the message "Bad file descriptor".  I   
>>>> think
>> ...
>>> You must keep your IndexSearcher instance alive and well when  working  
>>> with Hits.  Hits internally uses the searcher to page  through results  
>>> - it does not keep all results in memory.  I'm  not sure why you  aren't 
>>> seeing all the documents you expect, but  if you package it up  as a 
>>> simple RAMDirectory-using JUnit  TestCase then I'd be happy to  run it 
>>> and see.
>> mmm!  Going to have to rething my "Database" interface, so that I  
>> actually get the page of results I need coupled with the search.
>> How do you get over the fact that the hits may be on several web  pages 
>> and the user may go away between getting the hits and  actually 
>> retrieving a document in detail.  Do you have to serialize  the searcher 
>> and put it into a session?
> One option is to just carry along the key to the document, generally  
> something unique like an "id" field.  When a request comes in for a  
> document, it would pass it's document id, not the hit number.  Then  
> simply search using a TermQuery for that document, or use IndexReader  to 
> navigate to it.

Yes, I am doing all of that for the majority of what I am doing.  The tricky 
one is getting an index of all my documents stored.  This could be more than 
one pages worth. 

But I found a copy of chapter 3 of your book on the web, where you recommend 
that you re-do the query for each page (I assume by querying and then 
calculating n based on page number and items_per_page to the call 


Alan Chandler 

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