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The sqlite3_step method executes a prepared statement You must call this method at least once For instance, when calling insert or update, you call sqlite3_step once You only call it once because these statements do not result in a record set being returned from the database When selecting data, you typically call this method multiple times until you receive no more results The following is the method s signature

o far, we ve created new objects in two different ways. The first way is [SomeClass new], and the second is [[SomeClass alloc] init]. These two techniques are equivalent, but the common Cocoa convention is to use alloc and init rather than new. Typically, Cocoa programmers use new as training wheels until they have enough background to be comfortable with alloc and init. It s time for your training wheels to come off.

int sqlite3_step(sqlite3_stmt*);

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Allocation is the process by which a new object is born. It s the happy time when a chunk of memory is obtained from the operating system and designated as the location that will hold the object s instance variables. Sending the alloc message to a class causes that class to allocate a chunk of memory large enough to hold all its instance variables. alloc also conveniently initializes all the memory to 0. That way, you don t have the problem of uninitialized memory causing all sorts of random bugs that afflicts many languages. All your BOOLs start out as NO; all your ints are 0; all your floats become 0.0; all your pointers are nil; and all your base are belong to us (sorry, couldn t resist). A newly allocated object isn t ready to be used right away: you need to initialize it before you can work with it. Some languages, including C++ and Java, perform object allocation and initialization in a single operation using a constructor. Objective-C splits the two operations into explicit allocation and initialization stages. A common beginner s error is to use only the alloc operation, like this:

Like the other SQLite methods, this method returns a response code you should check after calling the method

You select one or more records from a SQL database using a select statement Because a select statement usually returns multiple rows, you must loop through the row set if you wish to obtain all records

Car *car = [Car alloc];

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while (sqlite3_step(statement) == SQLITE_ROW){ //process row here }

This might work, but without the initialization, you can get some strange behavior (also known as bugs ) later on. The rest of this chapter is all about the vital concept of initialization.

You obtain column values through a method in Listing 16-5 Using these methods will become more apparent after the next task Listing 16-5 Methods for obtaining column data (from SQLite online documentation)

The counterpart to allocation is initialization. Initialization takes a chunk of memory and gets it ready to become a productive member of society. init methods that is, methods that do initialization almost always return the object they re initializing. You can (and should) chain your allocs and initializations like this:

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const void *sqlite3_column_blob(sqlite3_stmt*, int iCol); int sqlite3_column_bytes(sqlite3_stmt*, int iCol); int sqlite3_column_bytes16(sqlite3_stmt*, int iCol); double sqlite3_column_double(sqlite3_stmt*, int iCol); int sqlite3_column_int(sqlite3_stmt*, int iCol); sqlite3_int64 sqlite3_column_int64(sqlite3_stmt*, int iCol); const unsigned char *sqlite3_column_text(sqlite3_stmt*, int iCol); const void *sqlite3_column_text16(sqlite3_stmt*, int iCol); int sqlite3_column_type(sqlite3_stmt*, int iCol); sqlite3_value *sqlite3_column_value(sqlite3_stmt*, int iCol);

The int iCol arguments in the methods in Listing 16-5 are a zero-based index into the columns in the results of the sqlite3_stmt, not an index into the columns of a SQLite database table

Car *car = [[Car alloc] init];

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16:

and not like this:

1 Return to your MyDBProject in Xcode 2 In Classes, create a new group called Model 3 Create a new Objective-C class in the Model group called PhotosDAO Create another

Car *car = [Car alloc]; [car init];

4 Add a name, photoID, and photo property to PhotoDAOh and PhotoDAOm (Listings 16-6

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