Managing a query result through several web pages

Hi,
I wonder what's the best way to manage a query result through several web
pages in the following context.
The query result is large and needs to be available through several web
pages. The user can scroll forward and backward through the pages.
One can :
- rerun the query at each web request and use random access
- run the query once for the first request, keep the pm and the query
somewhere (in a singleton class for example with a key in the HTTP
session) and use random access for handling the other requests (the
problems I see are to keep a connection for each user in this use case and
to decide when to close the previously mentioned objects)
- rerun the query at each web request, including in the filter a test on a
field and an ordering to start the results from the last one displayed
(being able to specify the maximum number of rows desired would be nice).
Thanks for any advice or suggestion.
Regards.

I think Frank's suggestion is probably the best tradeoff between memory
consumption (which would be high if you were to store the enire query
result in the session) and performance (which might be hurt if you
re-issue the query every time).
Note that Kodo 3.0 will provide a getObjectsById(Object[] ids) method
that should help in quickly instantiating a page of query results.
Query result limiting is currently under discussion for inclusion in the
JDO specification. We may have something for this in an upcoming Kodo
release (although not for 3.0).
In article <[email protected]>, Frank Riley wrote:
[email protected] (Patrice) wrote in
news:[email protected]:
Hi,
I wonder what's the best way to manage a query result through several
web pages in the following context.
The query result is large and needs to be available through several
web pages. The user can scroll forward and backward through the pages.
One can :
- rerun the query at each web request and use random access
- run the query once for the first request, keep the pm and the query
somewhere (in a singleton class for example with a key in the HTTP
session) and use random access for handling the other requests (the
problems I see are to keep a connection for each user in this use case
and to decide when to close the previously mentioned objects)
- rerun the query at each web request, including in the filter a test
on a field and an ordering to start the results from the last one
displayed (being able to specify the maximum number of rows desired
would be nice).For our paging code, we convert the query result to a list of object ids
(using pm.getObjectId()). We store this list on the session and only
instantiate the objects we need for a particular page (using
pm.getObjectById()). When a user does something that could possibly
change the query result, we rerun the query and replace the list on the
sesssion.--
Marc Prud'hommeaux [email protected]
SolarMetric Inc. http://www.solarmetric.com

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