Is there any way to map tables in rutime dynamically?

Hi
Thank you for reading my post
My question is mostly technical and i want to know whether with EJB 3.0 (JPA) can do this or not.
we have an application which we are going to port it to EJB 3.0 from plain JDBC.
In our application, we have tables which are created after we complete the code,
Tables are created in customer environment based on thier requirement. we store all details about tables in our metadata system. this details contain table structure and business roles for that tables
So, We have some tables which we know all of its details but we do not have access to application to recompile it or do mapping procedure again.
And we need to store records into those tables and also perform EJB Query on them.
What i want to know is:
-Is there any way that we could map them dynamically in runtime?
-How we can query them if we can not map them programically?
-What will be the query result? it is a collection? if it is a collection, then what are collection elements?
Thanks

Thank you for reply.
We have some tables that are added to our system after we developed the core application.
Now we need to access those tables using EJB 3.0 .
We can not predict what kind of tables will be added, when customer add those table they also provide vast amount of metadata that our application need.
before we think about moving to EJB 3.0, we used JDBC to handle CRUD on those new tables based on metadata that customer file into our core application.
Now that we thought to move to EJB 3.0, we do not know how to handle those new tables that cutomer define.
We can not predict what kind of table they will create, so we should find some way to :
Create all required EJB 3.0 artifacts from
-A database Table
-and business metadata that customer file into our core application.
when we had JDBC, we could create dynamic SQL statement using table name and those meta data. but now with EJB 3.0 we can not find a way to do this because EJB 3.0 need some java class to be present before we could map anything.
Thanks

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