Hi Andrus, thanks for your help! Every time i need something, Cayenne solve my problem :D
D. On 7/7/07, Andrus Adamchik <[EMAIL PROTECTED]> 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.
