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I am trying to create an application in which server will push updated/new data to the iPad whenever there’s any change in the database(just like how the mail application works). I think APNS wont work in this scenario but i could be wrong. Can anyone suggest any good approach to get this functionality?
You might find this wikipedia article about Push Technology interesting, specifically the section where it deals with “long polling”. And you can have a sample implementation of long polling for ios here (also by having a look at this other post).
On the other hand, you might well try and use APNS so that the server notifies the app when new data is available, then the app (possibly after some user interaction) can get the new data.