Re: [rules-users] Retrieving facts from a database
This is dependent on your data model, but in general you need objects to be in memory for
them to be matched to each other. i.e. if you have a rule that matches object type A to
object type B, then the instances of A and B you want potentially matched need to be
loaded into memory.
Another alternative is to use the "from" keyword. Input to "from" can
come from anywhere. YOu can match on objects loaded directly from the database.
http://downloads.jboss.com/drools/docs/4.0.7.19894.GA/html_single/index.h...
From the docs:
"One common example [of using from] is the
integration with data retrieved on-demand from databases using hibernate named
queries."
--- On Wed, 1/14/09, Bryan Basham <b_basham(a)yahoo.com> wrote:
From: Bryan Basham <b_basham(a)yahoo.com>
Subject: [rules-users] Retrieving facts from a database
To: rules-users(a)lists.jboss.org
Date: Wednesday, January 14, 2009, 9:38 AM
Hi all,
I've been lurking on this alias for a while but I have
not seen any questions about this so I thought I would
ask...
Our application is DB intensive with potentially millions
of rows in certain tables. Currently, we are testing Drools
in our app with small data sets that can easily be loaded
into Java heap memory, but we are concerned about the
scalability of our design. My question is: Does Drools
support a mechanism to dynamically load pages of facts into
the working memory? Or do you have to load *all* facts in
at one time as we are currently doing it?
Any pointers (especially to web pages or documentation)
would be appreciated.
Thanks,
Bryan
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