Update datastore in Google App Engine from the iPhone

I'm working on an app that communicates with Google App Engine to update and retrieve user information, but I can't think of a way to modify elements in the datastore.

For example, every user for my app is represented by a User object in the datastore. If this user inputs things like email, phone number, etc in开发者_如何学编程to fields inside the iPhone application, I want to be able to update those objects in the datastore. The datastore can be in Java or Python, I'm just looking for an idea that will work.

Thanks

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Why not have the iPhone application communicate this information to app engine by making a simple HTTP request?

Specifically, I would do an HTTP POST to the server and include the relevant fields. Then your app engine request handler would simply store the information in the datastore.