在不丢失数据的情况下更新Data Core中的实体的最简单方法

Question

I have an iOS app on App Store that utilized Data Core with SQLite engine. The updated version that I plan to update needed to add several more attributes (fields) to an entity (table). What is the simplest way to handle this without losing data on already existing SQLite database?

Answer 1

The way to do this is with what's called a "Core Data Migration".

Here's the Core Data Model Versioning and Data Migration Programming Guide

Also, some initial posts:

Data migration with core data

core data migration

http://www.timisted.net/blog/archive/core-data-migration/