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If your application needs to store and retrieve complex object hierarchies, you ll want to consider using CoreData, which we ll be covering in the next chapter However, for simple data storage needs, or for a database that you can use in a non-iOS application, SQLite is an efficient, powerful solution This chapter covered all of the basics for adding a database to your application You learned how to create a new database, embed it in your application and retrieve values from the database Then you learned how to make the database writable and implement insert, update, and delete operations If you do much programming for iOS, you will quickly find that all but the simplest applications need to store data For that reason, the techniques that you learned in this chapter are very important You will need to understand and master the techniques of this chapter or the next one on CoreData if you re going to do any significant iOS development

Here are the results:

Understanding Core Data s basics Creating a Core Data model Understanding how to load, fetch, and save a model s data Building a complex navigation-based application using Core Data Knowing where to obtain more Core Data information

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That s, uh, special. But, if you have an ASCII chart handy (you can find one by firing up the terminal and typing the command man ascii), you can see that this chunk of hexadecimal is actually our string. 0x48 is H , 0x69 is i , and so on. The -length method gives us the number of bytes, and the -bytes method gives us a pointer to the beginning of the string. Notice the + 1 in the +dataWithBytes: call That s to include the trailing zero-byte that C strings need. Also notice the 00 at the end of the results of the NSLog. By including the zerobyte, we can use the %s format specifier to print the string:

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ith its addition to the iOS SDK, Core Data is arguably the best choice for persisting an application s data It is more robust than using properties and is easier than using SQLite You can visually lay out your application s data model, much as you would when using a database-modeling tool Moreover, it provides the infrastructure for managing the objects you create, freeing you from writing the typical object management code As this chapter will demonstrate, using Core Data is a natural choice for persisting an application s data Core Data allows you to focus on the application rather than on the code persisting the application s data In previous chapters, the Try This examples were generally very small applications that illustrated a single concept but would never be mistaken for a full iOS application that you might find in the App Store In this chapter, we re going to build a more complex reference application By the end of this chapter, you ll have a fairly useful application that, while not quite ready for the App Store, just needs a little more data and some polish In 19 we ll take the result of this chapter and turn it into a universal application that will also run native on the iPad with its larger screen Since the application we are building will have several views and build on skills that you learned in earlier chapters, in the interest of readability, we will only provide complete in-line code listings where we are illustrating new functionality Before getting started on this chapter, it will be helpful to download the DogBreeds-Final sample code for this chapter With the completed sample application code handy, you can reference it when you re not sure how to do a particular step

NSLog (@"%d byte string is '%s'", [data length], [data bytes]);

Core Data is a framework used to easily manage an application s data objects Core Data consists of managed object models, managed object contexts, and persistent data stores A managed object model contains an object graph The object graph is a collection of objects and their relationships with one another You create a graph using Xcode s data modeler The data modeler is where you visually add entities and create relationships between them

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17:

which results in the following output:

Figure 17-1 Core Data s architecture (simplified)

30 byte string is 'Hi there, this is a C string!' NSData objects are immutable. Once you create them, that s it. You can use them, but you can t

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