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There are several alternatives to this implementation that are worth considering. For very simple data storage needs, you may be able to get by with serializing your data to a plist file using the NSCoder APIs. This has the advantage of being as simple as a call to writeToFile:atomically:. The disadvantage is that the entire data set has to be loaded into memory each time, and there is no built-in way to search through the objects and bring back just the necessary set. This isn t recommended for storing more than a handful of records. If your application has higher data demands, there are other higher-end alternatives as well. It seems like every time I check, there are a few more floating around to handle this. The two I m familiar with are FMDB and Apple s implementation of an object graph persistence framework: Core Data. FMDB is roughly equivalent to the ISDatabase class, with some code to handle more automatic retries, the option to store prepared statements for a speed boost, and handling for more SQLite error states. It s a solid implementation, and you wouldn t be remiss in using this as the basis for an Active Record variant of your own. Core Data is Apple s persistence framework. It has built-in Xcode support for creating schemas and migrations visually. It is fast, robust, and available as of iPhone SDK 3.0.
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CHAPTER 5: Stick Around: Building Data-Driven Applications with SQLite
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Being used to SQL, I find myself more comfortable in that world. If you re less familiar with SQL, then this should be the first persistence framework that you try if you are looking for something to handle the heavy lifting for you. I suggest using the SQLite persistence store option; it is generally better at handling larger data sets efficiently and has no real drawbacks.
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Summary
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In this chapter, you went through building a simple Active Record implementation from the ground up. You started with the SQLite C APIs and built a wrapper around them to make data access using SQL less of a chore. From there, you used a simple class as the basis for saving and retrieving your model objects from the database. Then you took a quick foray into the world of migrations, making sure that you can build on earlier versions of your database when moving to the next version of your application. Finally, I discussed a few alternatives to this implementation. I hope you now have a good working knowledge of the SQLite APIs available on the iPhone and a good basis for building a data-driven application. I look forward to hearing about what you do with it!
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Ray Kiddy
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Company: Consultant, Ganymede Resources Location: Sunnyvale, CA
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Former Life As a Developer: Data Application and UI development, 15 years in Apple, 7 in the WebObjects team in Developer Tools. Managed servers when gopher was still cool. Developed Cocoa applications, Xcode plugins, Server Admin UI, deployment tools for web applications. Developer for extensions and custom web UI in Firefox, worked at Mozilla after Apple. Studying mathematics at SJSU. Life as an iPhone Develooper: ClickAccuracy (Developer Utility), Collectionator, iPhoneSmart Analytics framework/infrastructure, MindOverMatter game suite
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What's in This : Modeling with CoreData Dealing with Schema Migration A Flexible Schema Object Class Connecting to Remote Databases Testing Data iPhone Apps
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Key Technologies: CoreData Xcode MigrationManager NSKeyValueCoding
Core Data and Hard-Core Design
The iPhone is an amazing device for getting information at a moment s notice. Whether I am waiting for a train, waiting in line for coffee, or waiting on hold for someone to pick up the phone, thoughts come to me, and I may need to answer a question quickly in order to do something useful with the thought. If I wait until later, when I have more time, then I have often forgotten the idea or question. The iPhone has a lot of data applications, suited to whatever particular task you have. And if you have that niche market idea or that odd situation where people want to organize information in some particular way, then you can create your own data application for them. The iPhone has tools that make it surprisingly easy to design these apps so that you can let users use your interface and reuse their data in interesting ways. The key to designing a good data application for the iPhone is simplicity. For most data people, this cuts across the grain. Every time I create a data application, I want the application to know everything, do everything, hold the users in its hands, and make them feel comfortable because absolutely everything is taken care of by the application. The iPhone interface is constrained, though. You absolutely cannot do everything, no matter how much you want to do so. You must do just what your users need at that moment and nothing more. Making your application responsive and flexible is more important than handling every situation. So, how can the tools that we have available help us create the right kind of application It turns out that if you want to focus on the user experience and not on the database and if you want to think about the user workflow and not tables and columns and joins, then Core Data will be your friend.
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