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From Chris Lu <>
Subject Re: Mapping Lucene search results with a relational database
Date Tue, 03 Jul 2012 08:04:48 GMT
Can you index the rule1 and rule2 fields into the documents, and when 
searching with the keywords, also append rule1:foo and rule2:bar to the 

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On 7/3/12 12:56 AM, Jochen Hebbrecht wrote:
> Hi all,
> I have an application which holds a list of documents. These documents are
> indexed using Lucene.
> I can search on keywords of the documents. I loop the TopDocs and get the
> ID field (of each Lucene doc) which is related to the ID column in my
> relational database. From all these ID's, I create a list.
> After building the list of ID's, I make a database query which is executing
> the following SELECT statement (JPA):
> <<
> SELECT d From Document WHERE id IN (##list of ID's retrieved from Lucene##)
> This list of document is sent to the view (GUI).
> But, some documents are private and should not be in the list. Therefore,
> we have some extra statements in the SELECT query to do some security
> checks:
> <<
> SELECT d From Document WHERE id IN (##list of ID's retrieved from Lucene##)
> AND rule1 = foo
> AND rule2 = bar
> But now I'm wondering: I'm using the speed of Lucene to quickly search
> documents, but I still have to do the SELECT query. So I'm loosing
> performance on this one :-( ...
> Does Lucene have some component which does this mapping for you? Or are
> there any best practices on this issue? How do big projects map the Lucene
> results to the relation database? Because the view should be rendering the
> results?
> Many thanks!
> Jochen

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