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Re: [eclipselink-users] Pagination and Results
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setFirstResult / MaxResults is the proper way to do pagination through JPA.
There are some other ways, but it is normally the most efficient.
Other methods include using a ScrollableCursor (EclipseLink API only), or
performing the pagination yourself using an order by and range comparison.
The result set is not cached when using setFirstResult / MaxResults, each
seperate query is a seperate database query. The resulting objects will be
cached.
Vespa, Anthony J wrote:
>
> Hello,
>
> I'm about to start exploring some pagination in my code for going
> through results, and I'm curious about tips and/or best practices for
> paging through results? I've seen some forum posts referring to using
> setFirstResult / MaxResults - is this the proper way?
>
> I will mainly be accessing data via named queries on entity objects, and
> the data sets could be quite large, so I am looking for the most
> efficicent way to page through results in different chunks (by 20, by 50
> etc)
>
> Also, lets say that I have a query that returns all the results for a
> given statement (eg 100). So user1 runs that and begins to page thru -
> and then user2 comes along to my web app and runs the same query but now
> there are 110 results - is the first result set object cached on a per
> user basis? I assume that in both queries the first 100 objects are
> cached but what about result sets and the number of results? Will this
> cause any issue with paging?
>
> Thanks for the help,
>
> Tony
>
-----
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http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland
http://www.oracle.com/technology/products/ias/toplink/ Oracle TopLink ,
http://www.eclipse.org/eclipselink/
EclipseLink , https://glassfish.dev.java.net/javaee5/persistence/ TopLink
Essentials
Wiki: http://en.wikibooks.org/wiki/Java_Persistence Java Persistence ,
http://wiki.eclipse.org/EclipseLink EclipseLink
Forums: http://forums.oracle.com/forums/forum.jspa?forumID=48 TopLink ,
http://www.nabble.com/EclipseLink-f26430.html EclipseLink ,
http://www.nabble.com/java.net---glassfish-persistence-f13455.html Glassfish
Persistence
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