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From mr.abanjo <mr.aba...@gmail.com>
Subject Re: How to create cayenne datamap on the fly
Date Sun, 08 Jul 2007 10:31:44 GMT
Hi Andrus,
thanks for your help!
Every time i need something, Cayenne solve my problem :D

D.



On 7/7/07, Andrus Adamchik <andrus@objectstyle.org> wrote:
>
> Hi there,
>
> Actually Cayenne is one of the few ORM engines where you can define
> both your metadata, and persistent objects on the fly if you want to.
> So...
>
> 1. While I never tried loading DataMap XML from a remote URL, it
> should work. Just subclass
> 'org.objectstyle.cayenne.conf.DefaultConfiguration', overriding
> 'getMapConfiguration' method to open a remote URL. You may find this
> page useful when doing that:
>
> http://cayenne.apache.org/doc20/customizing-configuration.html
>
> 2. Yes, you can totally do that using generic persistent classes:
>
> http://cayenne.apache.org/doc20/generic-persistent-class.html
>
> The main trick is to access the objects via DataObject interface
> methods instead of concrete setters and getters.
>
> Andrus
>
>
> On Jul 7, 2007, at 1:12 AM, mr.abanjo wrote:
>
> > Hi all,
> > i'm writing an application that try to be indipendent from the
> > business
> > logic required.
> > The main idea behind this project is to use reflection to create on
> > the fly
> > the bean (CayenneDataObject) that normally i must write for map the
> > databese
> > structure.
> > What i need is:
> > 1) load cayenne data map xml from a URL. Basically this URL point to a
> > servlet that generate it on the fly. Normally this is the
> > configuration in
> > cayenne.xml:
> >
> > <map name="datamap-foo" location="META-INF/cayenne-datamap-
> > foo.map.xml" />
> >
> > whant i need is something like this:
> >
> > <map name="datamap-foo" location="
> > http://somedomain/cayenne-datamap-foo.map.xml" />
> >
> > is it possible?
> >
> > 2) i need to generate some DataObject on the fly. So i'm thinking
> > to use
> > Reflection. Do you think that is possible?  The main idea is that
> > at runtime
> > i don't know the structure of my entity. For example, "user" can be
> > composed
> > only by "name" and "surname" attribute... or... have also
> > "address".. and so
> > on. I don't want to create every time the corresponding DataObject.
> > I want
> > to implements an engine that create them on demand.
> >
> > I don't know if this is a right approch on the problem. Maybe
> > cayenne has
> > some API for doing this type of activity.
> >
> > Thanks in advance, for help.
> >
> > D.
>
>

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