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.
