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How to manage database changes while upgrading application versions in android?

With every upgrade there is some change in database schema? The change could alteration of column types or addition/deletion of columns.

This forces a reinstall of app ie., uninstall older version and then download app again from the android market.

Is there a best practice to follow so that old data is copied during app installation and reinitialized with newer schemas?

在SqliteOpenHelper的实现中重写方法onUpgrade()

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