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When writing a program for any platform, you should adhere to the MVC design pattern as closely as possible Rather than placing the database logic in a view or view controller, you created separate classes, insulating the view and controller layers from the database layer The MyDBProjectViewController knows nothing about the underlying SQLite3 library; the view controller only knows about PhotosDAO and PhotoDAO Notice you further separated the code by placing it in its own group, Model, under Classes All this separation makes debugging and maintaining the program easier It also makes reading and understanding this chapter s example code easier

Some objects have more than one method that starts with the word init. In fact, it s important to remember that init methods are nothing special. They re just ordinary methods that follow a naming convention. Many classes have convenience initializers. These are init methods that do some extra work, saving you the trouble of doing it yourself. To give you an idea of what we re talking about, here s a sampling of some of NSString s init methods:

16:

Firm B $8,000,000

To keep the task s length manageable and focused, rather than creating several data access methods in PhotosDAO, you only created one

- (id) init;

- (NSMutableArray *) getAllPhotos;

Skeleton RHS of Balance Sheet [1] Interest-Bearing Debt Equity Total Debt & Equity Total Assets $2,000,000 $10,000,000

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This basic method initializes a new, empty string. For immutable NSStrings, this method isn t terribly useful. But you can allocate and initialize a new NSMutableString and start throwing characters into it. You d use it like this:

This method returns an array of PhotoDAO objects The getAllPhotos method first finds the database and opens it Because the database is in the resources folder, you can access it directly using the bundle s resourcePath (When you want to create an application that uses canned [predefined] data, this task illustrated how to create that data in advance [using SQLite Manager in Firefox] and then embed it in your application)

NSString *emptyString = [[NSString alloc] init];

NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *theDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent: @"myDatabasesqlite"];

$10,000,000 $10,000,000

if (!(sqlite3_open([theDBPath UTF8String], &database) == SQLITE_OK))

- (id) initWithFormat: (NSString *) format, ...;

Notice that you obtain the UTF8String from the NSString before passing the sqlite3_open method the path Since opening the database is a common activity, you might want to move that portion of the code into its own method for easy reuse

ROE (Row 25) 430%

This version initializes a new string to the result of a formatting operation, just like we did with NSLog() and with the stringWithFormat: class method you saw in 7. Here s an example that gives the flavor of using this init method:

After opening the database, you query it for the photo records If you have ever worked with a database using code, for instance, Java Database Connectivity (JDBC), then this code should look familiar The getAllPhotos method first creates the SQL select string Next, the method places the string in a statement and then queries the database After obtaining the data, getAllPhotos loops through each record For each new record, getAllPhotos creates a new PhotoDAO The newly created PhotoDAO object s values are then set to the appropriate values from the current record After initializing the PhotoDAO object, getAllPhotos places the object into PhotosDAO s photosArray

This code snippet is useful It shows you a quick, easy way to load a blob, any blob, into an NSData object First, load the blob into a C string

string = [[NSString alloc] initWithFormat: @"%d or %d", 25, 624];

Firm B Weighted ROE 1075%

const char * rawData = sqlite3_column_blob(statement, 2);

This gives you a string with the value of "25 or 624".

int rawDataLength = sqlite3_column_bytes(statement, 2);

- (id) initWithContentsOfFile: (NSString *) path;

NSData *data = [NSData dataWithBytes:rawData length:rawDataLength];

Standard Deviation 280% 700%

As you already know the database blob is an image, you initialize the PhotoDAO s photo property using the UIImage s initWithData method

The initWithContentsOfFile: method opens the text file at the given path, reads everything there, and initializes a string with the contents. The following line of code reads the file /tmp/words.txt:

aPhotophoto = [[UIImage alloc] initWithData:data];

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string = [[NSString alloc] initWithContentsOfFile: @"/tmp/words.txt"];

This same technique works for other binary data as well (replacing UIImage with the appropriate class)

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