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——处理数据模型变化的正确途径是什么?
原标题:iOS - what is the right way to deal with a data model change?

I already have an app in the app store. I want to do an upgrade. My local data store has changed, with an extra table, and with a few fields added in the existing table. I want to retain the data in the old tables. How would I go about doing that? Could someone point me to tutorials that handle that kind of change?

最佳回答

http://developer.apple.com/library/mac/#documentation/coa/conceptual/CoreDataVersioning/Articles/Introduction.html 果 Apple-docs,迁移核心数据。 这使得90%的案件容易发生。 基本想法是,你将Xdatamodel分解成版本,因此它有移徙的道路。

www.un.org/spanish/ecosoc http://mobile.tutsplus.com Core Data Migration

问题回答

假设你重新使用QL: 利用一个名称不同的新数据库进行更新。 开始时,用旧名称核对表格,复制你想要的数据,并在你重新做时删除。

CoreData有自己的最新数据,可能或不可能为你工作。 你们应研究如何改变数据模式。





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