Alternative data source for EO and VO

It is usually the requirement to customize the Entity Objects and View Objects so that they can work with data sources different than database schema objects (tables, views,...), some examples are Web Service or Oracle Coherence cache.
I have developed mini projects using both data sources mentioned, by overriding relevant methods in the implementation EO and VO classes. There is one limitation I realize when developing these projects. Although both the EO and VO rely directly and completely on the alternative data sources (Web Service and Coherence), still there must be a schema object existing in the local database to back the EO and VO. This is because I still have to call super methods from ViewObjImpl and EntityImpl, and these methods are still doing some operations with the schema objects, and without these objects, ORA-00942: table or view does not exist will be thrown.
For example, after overriding executeQueryForCollection in ViewObjImpl to take data from web service, it is still necessary to call super.executeQueryForCollection so that data will actually appear on the web page, and without the schema objects, this method will throw ORA-00942.
My question is, is there any way to completely eliminate the need of schema objects in EO and VO? I know the answer (if exist) will be complicated but I'm willing to explore.
Thanks.

Thanks Timo,
I figured out how to achieve this.
Basically when creating the EO, I did not specify the schema object in the first step, and for each attribute that I created in the wizard, I also unchecked the checkbox "persistent". I could then create VO based on this EO and override all the necessary methods in the EO and VO so they can do CRUD operations via Web Service.
In the case of only creating an VO (read-only, for retrieving/reading data only), I could also mark each attribute as "transient" by checking a checkbox in the creation wizard.
Edited by: nhd on May 7, 2013 8:01 PM

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