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+ (void) moveDatabase { NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *theDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"myDatabasesqlite"]; NSError *error; BOOL success; NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString * docsDir = [paths objectAtIndex:0]; NSString * newPath = [docsDir stringByAppendingPathComponent:@"myDatabasesqlite"]; [fileManager removeItemAtPath:newPath error: &error]; success = [fileManager copyItemAtPath:theDBPath toPath:newPath error: &error]; if (!success) { NSLog(@"Failed to copy databaseerror handling here %@", [error localizedDescription]); } } - (NSMutableArray *) getAllPhotos { NSMutableArray * photosArray = [[NSMutableArray alloc] init]; @try { NSFileManager *fileManager = [NSFileManager defaultManager]; NSArray * paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); NSString * docsDir = [paths objectAtIndex:0]; NSString * theDBPath = [docsDir stringByAppendingPathComponent: @"myDatabasesqlite"]; BOOL success = [fileManager fileExistsAtPath:theDBPath]; if (!success) { NSLog(@"Failed to find database file '%@'"); }

This code assumes that Car is doing the right memory management thing, arranging to retain the object. Note that the Car as shown in 6 doesn t follow our memory management guidelines we were so young and naive then but we ll show you how to fix that in a little while. After the tires are assembled, a new engine is created, just as before, and the engine is placed in the car:

ROE (Row 25) 180%

16:

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if (!(sqlite3_open([theDBPath UTF8String], &database) == SQLITE_OK)) { NSLog(@"An error opening database, handle error here"); } const char *sql = "SELECT id,name,photo FROM photos"; sqlite3_stmt *statement; if (sqlite3_prepare_v2(database, sql, -1, &statement, NULL) != SQLITE_OK) { NSLog(@"Error, failed to prepare statement, handle error here"); } while (sqlite3_step(statement) == SQLITE_ROW) { PhotoDAO * aPhoto = [[PhotoDAO alloc] init]; aPhotophotoID = sqlite3_column_int(statement, 0); aPhotoname = [NSString stringWithUTF8String:(char *) sqlite3_column_text(statement, 1)]; const char * rawData = sqlite3_column_blob(statement, 2); int rawDataLength = sqlite3_column_bytes(statement, 2); NSData *data = [NSData dataWithBytes:rawData length: rawDataLength]; aPhotophoto = [[UIImage alloc] initWithData:data]; [photosArray addObject:aPhoto]; } if(sqlite3_finalize(statement) != SQLITE_OK){ NSLog(@"Failed to finalize data statement, error handling here"); } if (sqlite3_close(database) != SQLITE_OK) { NSLog(@"Failed to close database, error handling here"); } } @catch (NSException *e) { NSLog(@"An exception occurred: %@", [e reason]); return nil; } return photosArray; }

Engine *engine = [[Slant6 alloc] init]; [car setEngine: engine]; [engine release];

Firm B Weighted ROE 450%

(continued)

As with the tires, the engine is released, because we re done using it. It s up to the Car to make sure the engine gets deallocated. Finally, the Car is told to print itself out, and the Car is released because we re done with it:

Listing 16-19

[car print]; [car release];

-(IBAction) changePhotosImage: (id) sender { PhotosDAO * myPhotos = [[PhotosDAO alloc] init]; NSString * imgPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"photo4png"]; [myPhotos changeAPhotoImage:[[UIImage alloc] initWithContentsOfFile: imgPath] theID: currentID]; [selfphotos release]; selfphotos = [myPhotos getAllPhotos]; [myPhotos release]; } 6 Open MyDBProjectViewControllerxib and add another bar button to the toolbar Change

Standard Deviation 80% 200%

7 Connect the changePhotosImage action to the Change button 8 Save and exit Interface Builder Click Build And Go to run the application in the iPhone

Now the autorelease pool gets released, which causes its retain count to go to 0, deallocates the pool, and sends the release message to every object in the pool. When this happens, the NSStrings generated by the Tire description method get cleaned up:

Simulator (Figure 16-8)

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[pool release];

16:

And then main ends, at last. But before we can run the program, we need to fix up the Car class so that it handles its memory management correctly. But first, here s what main would look like in a garbage-collected world:

Updating a record is as straightforward as inserting it The changeAPhotoImage first creates a SQL string with parameters It then binds a file s binary data to photo and an integer to id After binding, it then calls the step function once, finalizes the statement, and closes the database Notice that updating requires the record s id, as SQLite uses the id to update the correct record To accommodate this requirement, you added a currentID variable and changed the changeImage method to set the currentID with the currently selected photo record

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1 Quit the application and return to Xcode 2 Add a new method called deletePhoto to PhotosDAO (Listing 16-20)

int main (int argc, const char * argv[]) { Car *car = [[Car alloc] init]; int i; for (i = 0; i < 4; i++) { Tire *tire; tire = [[Tire alloc] init]; [tire setPressure: 23 + i]; [tire setTreadDepth: 33 - i]; [car setTire: tire atIndex: i]; } Engine *engine = [[Slant6 alloc] init]; [car setEngine: engine]; [car print]; return (0); } // main

Listing 16-20

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