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A well-built e-commerce site will be much cheaper to run than a comparable offline business. Under conventional business models, a staff member must feed an order into the company s order-processing system. With e-commerce, the customer can do this for you the gateway between the site and the order processing can be seamless. Of course, after your e-commerce site is up and running, the cost of actually taking orders gets close to zero you don t need to pay for checkout staff, assistants, security guards, or rent in a busy shopping mall. If you have a sound business idea, and you execute the site well, you can receive these benefits without a massive investment. What s important is to always focus on the almighty dollar: Will your site, or any particular feature of it, really help you get more customers, get customers to spend more, or reduce the costs and therefore increase your margins Now it s time to introduce the site we ll be using as the example in this book, and see just how all of these principles relate to our own shop.

When you create an image using the Image class, or a font using the Font or BaseFont class, you don t have to worry about the way these objects are stored in the finished document. For example, when you use a standard Type 1 font, iText will add

a font dictionary to the PDF file. When you use a font that is embedded, the font dictionary will also refer to a stream with a full or partial font program that is copied into the PDF file. In this section, we ll look at advanced techniques that address the lowest level of PDF creation and manipulation with iText. The examples that follow were inspired by questions that were posted to the mailing list (see appendix B for more info about the list).

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1. Add the database login information at the end of hatshop/include/config.php, modifying the constants values to fit your server s configuration. The following code assumes you created the admin user account as instructed in 2: // Database login info define('DB_PERSISTENCY', 'true'); define('DB_SERVER', 'localhost'); define('DB_USERNAME', 'hatshopadmin'); define('DB_PASSWORD', 'hatshopadmin'); define('DB_DATABASE', 'hatshop'); define('PDO_DSN', 'pgsql:host=' . DB_SERVER . ';dbname=' . DB_DATABASE); 2. Create a new file named database_handler.php in the hatshop/business folder, and create the DatabaseHandler class as shown in the following code listing. At this moment, we only included its constructor (which is private, so the class can t be instantiated), and the static GetHandler method, which creates a new database connection, saves it into the $_mHandler member, and then returns this object. (Find more explanations about the process in the upcoming How It Works section.) < php // Class providing generic data access functionality class DatabaseHandler { // Hold an instance of the PDO class private static $_mHandler; // Private constructor to prevent direct creation of object private function __construct() { } // Return an initialized database handler private static function GetHandler() { // Create a database connection only if one doesn t already exist if (!isset(self::$_mHandler)) { // Execute code catching potential exceptions try { // Create a new PDO class instance self::$_mHandler = new PDO(PDO_DSN, DB_USERNAME, DB_PASSWORD, array(PDO::ATTR_PERSISTENT => DB_PERSISTENCY)); // Configure PDO to throw exceptions self::$_mHandler->setAttribute(PDO::ATTR_ERRMODE,

The Service labels remain in the pivot table, but the labor costs have been removed from those rows. The columns with total labor costs for each lead technician have also been removed. The grand totals for rows and grand totals for columns remain in the pivot table. It was easy to hide the subtotals for all the fields in the pivot table, but now suppose you d like to show the subtotals for the Service field to see the total cost per service type. You ll change the subtotal setting for just that field: 1. In the pivot table, right-click one of the Service labels, such as cell A6. 2. In the context menu, click the Subtotal Service option. The LeadTech subtotals remain hidden, but the subtotals for the Service field are now visible. The grand totals for rows and columns remain in the pivot table.