Gary VanMatre on 23/01/06 20:11, wrote:
We have a situation where we require to paginate our result list (which
is quite huge, around 1000+ records). We found few tags like DisplayTags
from sourceforge.net but the current version does not support batch
lists (i.e. retrieving the list in batches based on the page the user is
in, instead of retrieving all in once). Is there a tag in Struts/JSTL
that would help display huge lists. Any help is appreciated.
None that I'm aware of:( Although I keep meaning to work on one. Ajax
would really be nice for this actually. You could go to the server to
get your next display and it would repopulate your display without the
whole page refreshing.
That would be slick but you would still have the problem of deciding how
to batch up your results without actually retrieving the full set. You still
need
to determine how many rows you want to display and how many pages.
Are you thinking of using something like a keyset cursor? Something
similar could be implemented using the standard DAO/VO pattern.
I've heard this described as ghost objects. The first data retrieval only returns
the primary keys populating ghost objects. The set of keys are used to retrieve
the details/rest of the object per page. Your initial inquiry returns the full set of
keys matching the criteria.
I implemented pagination with batched retrieval using Hibernate, which
takes a couple of parameters on its fetch methods, maxCount and
firstRecord.
It's fairly easy except the logic at the front-end was tricky when
trying to implement backwards and forward buttons and setting the new
firstRecord parameter to store on the jsp for the next submit.
Adam
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