Does BC4J works as ORM (eg: Toplink) to support for MSQL Server / Oracle DB

Hi,
My current product is running on Struts 1.1, Apache Cocoon(for reports generation), JDBC & MS SQL Server environment.
To provide the more flexibility & user friendliness to the application I have a proposal for the re-development of the application with ADF 11g.
But the main concern here is, the current product is running on MS Sql Server DB, now the product team has a future plan to migrate it to Oracle Database. In view of this DB migration, the frame work/environment that I choose for the re-development must support for very less code changes (at least from the Application Business logic/Queries prospective)
Here I have two options for the re-development
1. ADF 11g + Top-link (ORM) + MS Sql Server / Oracle DB
2. ADF 11g + BC4J + MS Sql Server / Oracle DB
Plz suggest me, out of these two options which one suits for my requirement & better in performance too

Check this out:
http://www.oracle.com/technology/products/jdev/collateral/papers/11/certification/index.html#Databases
Also
http://www.oracle.com/technology/products/jdev/11/how-tos/multidatabaseapp.html
Have a nice day

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