Sams Teach Yourself Cocoa Touch™ Programming in 24 Hours

Hour 17. Using the SQLite Database

What You’ll Learn in This Hour:

• Saving and reading data from files

• Saving and reading data from an SQLite database

In this hour, you’ll learn about data persistence: saving data to a file or a database so that it can be retrieved later. Files are flat data structures without inbuilt indexing capabilities, whereas databases associate data with indexes to enable fast data retrieval.

Saving and Reading Data from Files

The iPhone provides a standard POSIX C API for file access. However, recall that your application runs inside a sandbox, which prevents it from writing to any path. Cocoa Touch provides functions which return the paths you can access. Cocoa Touch also wraps the POSIX C API in a more pleasant ...