Error in persistent storage when the application update that happened.
I've been struggling with the problem for a long time.
MY application uses a persistent storage to store parameter information.
But when I update my application from version 1 to version 2, number of items in my configuration page has been changed, which means the new version of the page layout will load and save some new stuff in a persistent storage that did not exist in the old persistent storage.
Problem occurs when custorms update their request. How can we drag all the old stored information when users start to use the updated application?
I see these three options:
(a) the best thing to do is to delete the old application, which will get rid of the old persistent data.
(b) create a 'version2' of you persisted object with a different name. In your treatment of startup, you see if there is a version 1 object, and if so, migrate the setting of the object Version in 1 to your new object.
(c) try to your compatible changes. There are different ways to do this. A way that is easy to understand is to persist a string, which is your options encode in XML format. If you use an XML string, then you can add a new attribute to your new options - but the persistent object remains the same.
I hope this helps.
Tags: BlackBerry Developers
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