--- Bernard Ligny <[EMAIL PROTECTED]> wrote:
> Hello all,
>
> I am a new user of Castor JDO.
> I run (without any problem) the provided sample (the
> one with product, product detail, etc...).
>
> I have some questions concerning 1-N relations where
> the N-table is considered as "dependant"
> (i.e. exatcly the same situation as Product -
> ProductDetail):
>
> When getting a master (PROD), I see that the related
> query performs a join in order to
> get the id of all dependant/details records
...
> So my questions are:
> - is all what I have said here above correct or not
> ??
> - if yes, what is the best (i.e. minimize number of
> queries) solution to get all details of a given
> master ?
I found that what you described is true. I got some
better performance by preloading the dependencies.
I did not define the dependent class as actually
dependent, due to the problem you described of not
being able to fetch them independently.
I then set the dependent class to be cached, e.g.
<cache-type type="time-limited" capacity="300"/>
And then I select the dependent classes (all of them,
in my case; reading the whole table). Then, I select
all the master classes, and the dependent classes are
pulled from the cache to satisfy the dependency.
That made my performance tolerable.
=====
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
John Huxoll Gardner
[EMAIL PROTECTED]
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