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1 If you don t already have Firefox, download and install it 2 Select Add-ons from the Tools menu (Figure 16-1) 3 Select Get Add-ons, type SQLite in the search box, and install SQLite Manager 4 Once installed and you have restarted Firefox, select Tools | SQLite Manager

Firm B $8,000,000

16:

NSColor *color; color = [NSColor blueColor]; // use the color blueColor is not alloc, new, or copy, so you can assume it has a retain count of 1 and is

myDatabase Save the database file some place where you can easily find it later Note SQLite Manager automatically adds the sqlite extension

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

autoreleased. blueColor returns a global singleton object a single object that s shared by every program that needs it and won t actually ever get destroyed, but you don t need to worry about those implementation details. All you need to know is that you do not need to explicitly release the color.

6 Click Create Table and create a new table named photos 7 Add three columns: id, name, and photo Make id an INTEGER and check Primary Key

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8 Make name a VARCHAR and check only Allow Null 9 Make photo a BLOB and check only Allow Null 10 Your screen should resemble Figure 16-2 11 Click OK and the SQLite Manager generates the database table

Frequently, you ll want to keep an object around for more than a couple of lines of code. Typically, you ll put these objects into instance variables of other objects, add them to a collection like NSArray or NSDictionary, or more rarely, keep them as global variables. If you re getting an object from init, new, or copy, you don t need to do anything special. The object s retain count will be 1, so it will stick around. Just be sure to release the object in the dealloc method of the owner-object that s hanging on to it:

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(continued)

- (void) doStuff { // flonkArray is an instance variable flonkArray = [NSMutableArray new]; // count: 1 } // doStuff

SQLite does not enforce foreign key relationships You must instead write triggers manually to enforce foreign key relationships SQLite does not support right outer joins or full outer joins SQLite views are read-only 12 Click the Browse & Search tab, and then click the Add Record button 13 In the action sheet, leave id blank Type Icon One for the name Notice the small paper

ROE (Row 25) 930%

If you get an object from something other than init, new, or copy, you need to remember to retain it. When you re writing a GUI application, think in event loops. You want to retain autoreleased objects that will survive for longer than the current event loop. So what s an event loop A typical graphical application spends a lot of time waiting on the user to do something. The program sits twiddling its thumbs until the very slow human at the controls decides to click the mouse or press a key. When one of these events does happen, the program wakes up and gets to work doing whatever is necessary to respond to the event. After the event is handled, the application goes back to sleep waiting for the next event. To keep your program s memory footprint low, Cocoa creates an autorelease pool before it starts handling the event and destroys the pool after the event is handled. This keeps the amount of accumulated temporary objects to a minimum. The previous methods would be written as follows when using autoreleased objects:

clip beside photo Move your mouse over the paper clip, and the tooltip should say Add File as a Blob (Figure 16-3) Click the paper clip and add any photo from your computer If the photo column doesn t say something like BLOB (Size: 65984), the file was not correctly added as a blob

16:

- (void) doStuff { // flonkArray is an instance variable flonkArray = [NSMutableArray arrayWithCapacity: 17]; // count: 1, autoreleased [flonkArray retain]; // count: 2, 1 autorelease } // doStuff

Firm B Weighted ROE 2325%

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