At the very bottom, there are only two libraries for accessing Oracle:
- OCI binary library.
- Java OJDBC Jar File.
All other libraries (such as ODBC, ADO.NET) are based on one of these libraries (usually the OCI).
There is no OCI library for the iPhone (or any ARM architecture as far as I know), and no Java VM for using OJDBC. Thus, you cannot directly connect from iPhone to the Oracle database.
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