核心数据与多个sqlite文件 [英] Core Data with mutiple sqlite files

问题描述

如何在多个SQLite文件中使用Core Data？

How may I use Core Data with multiple SQLite files?

每个文件包含相同的结构，但是数据是从不同的位置检索的。

我希望能够在运行时根据应用程序设置在这些sqlite文件之间切换。

Each file contains the same structures but the data is retrieved from different locations.
I want to be able to switch between these sqlite files at runtime based on application settings.

推荐答案

只需指向永久存储协调器（NSPersistentStoreCoordinator） ）。

持久存储协调器支持添加和删除存储。删除时，您要确保内存中没有未保存的更改（很明显），一般来说，删除后，您不会搞砸从删除的存储中提取的任何实体。

Persistent store coordinators support addition and removal of stores. On removal, you want to make sure that there are no unsaved changes in memory (obviously) and, in general, that you will not be messing with any entities fetched from the removed store after removal.

但是，请注意，Core Data不支持两端对象在不同存储中的关系。

Be careful, though, as Core Data does not support relationships where the objects at either end are in different stores.

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