thx, that is what i've been looking for!
-----Ursprüngliche Nachricht-----
Von: Michael Gentry [mailto:blacknex..mail.com]
Gesendet: Freitag, 1. Juni 2007 16:17
An: use..ayenne.apache.org
Betreff: Re: performing count
The way you show is definitely the wrong approach, as it'll read the entire
table. Try:
http://cwiki.apache.org/confluence/display/CAYDOC/Customizing+Queries
Look at the "Indirect Queries" section at the bottom. That approach would
be much faster.
/dev/mrg
On 6/1/07, Peter Schröder <Peter.Schroede..reenet-ag.de> wrote:
>
> hi,
>
> i am wondering about the perfomance-impact of using cayenne to performing
> an result-count.
>
> currently i am doing something like this, wich is very straight-forward.
>
> SelectQuery query = new SelectQuery(Tcomrecherche.class,
> qualifier);
> List list = context.performQuery(query);
> return list.size();
>
> i could also use an SQLTemplate or a named query to perform a COUNT(*)
> which would be much uglier. i would prefer the first solution, but i think
> that this operation will take much more work for mysql-db than the direct
> query.
>
> are there some hints on how to handle this?
>
> kind regards,
> peter
>
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