An exception is thrown if Core Data finds that the persistent store is incompatible with the current data model. To solve this problem, we use a concept called Migration, which tells Core Data to move data from the old persistent store to a new one that matches the current data model. Migrations are of two types: Lightweight and Standard. Lightweight migration is easy to achieve (requires no coding) and is used when small modifications are applied to our data model that includes adding or removing attributes from an entity, adding or deleting an existing entity from the data mode, and so on. Whereas Standard migration is a bit complicated to implement as it requires creation of a mapping model and coding to inform Core Data to move the data from the old persistent store to the new one. The standard migration is out of scope of this book. We will only discuss lightweight migration in this book.
Core Data iOS Essentials
Core Data iOS Essentials
Overview of this book
Core Data is the essential ingredient in data driven iOS apps. It's used for storing, retrieving, and manipulating application data in databases, XML, and binary formats. It's an essential component for iPhone, iPod Touch, and iPad apps.Core Data Essentials provides a clear, readable guide to the most useful aspects of Core Data. Built around a realistic example app, the book showcases the most important aspects of Core Data development in the context of a complete, functioning app written in Objective C.The book starts with a tour of how the app works. Then you'll see how to easily display data using the Table View. You'll learn how to develop an appropriate data model that fits the needs of your app, then implement that model as updatable data objects. You'll see how to update data and build relationships between objects and learn how Core Data can work with search, and how to provide your users with friendly data editing features.
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Table of Contents (19 chapters)
Core Data iOS Essentials
Credits
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
Understanding Core Data
Understanding Objective-C Protocol and Table View
Designing a Data Model and Building Data Objects for Customers
Creating, Listing, and Deleting Names of Customers
Creating, Listing, Displaying, and Deleting Records of Customers
Updating and Searching Records of Customers
Entering, Saving, Listing, and Deleting the Records of the Products Sold to the Customers
Entering, Displaying, and Deleting the Stock
Editing the Stock Information
Displaying the Products for Sale and Updating the Stock
Appendix
Customer Reviews