Oracle client versions

we are currently running a 10.2.0.1 clients against a 11g database We would like to update to a more recent version. Our VB6 applications use oo4o and our .net apps use odac

Is there a way of doing this upgrade without having to change all of our applications.

If we do need to change our code is there a good way to do it so we can install new client versions in the future without needing to tweak 开发者_如何学Gocode.

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I've never had to change any code to update the oracle client. Have you already tried it on your dev system and got errors?