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// Execute the query and return the results return DatabaseHandler::GetAll($result, $params); } // Assigns a product to a category public static function SetProductDisplayOption($productId, $display) { // Build the SQL query $sql = 'SELECT catalog_set_product_display_option( :product_id, :display);'; // Build the parameters array $params = array (':product_id' => $productId, ':display' => $display); // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query return DatabaseHandler::Execute($result, $params); } // Assigns a product to a category public static function AssignProductToCategory($productId, $categoryId) { // Build the SQL query $sql = 'SELECT catalog_assign_product_to_category( :product_id, :category_id);'; // Build the parameters array $params = array (':product_id' => $productId, ':category_id' => $categoryId); // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query return DatabaseHandler::Execute($result, $params); } // Moves a product from one category to another public static function MoveProductToCategory($productId, $sourceCategoryId, $targetCategoryId) { // Build the SQL query $sql = 'SELECT catalog_move_product_to_category(:product_id, :source_category_id, :target_category_id);'; // Build the parameters array

<fileset dir="dd"> <include name="*.properties"/> </fileset> </copy> </target> <target name="compile-clean"> <delete includeemptydirs="true"> <fileset dir="${classes}" includes="**/*"/> </delete> </target> Notice that we ve added two more targets other than compile. These are compile-init and compile-clean. The compile-init target simply creates the classes directory by making use of the mkdir task. The compile-clean target uses the delete task to remove the directory and all of its contents.

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$params = array (':product_id' => $productId, ':source_category_id' => $sourceCategoryId, ':target_category_id' => $targetCategoryId); // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query return DatabaseHandler::Execute($result, $params); } // Changes the name of the product image file in the database public static function SetImage($productId, $imageName) { // Build the SQL query $sql = 'SELECT catalog_set_image(:product_id, :image_name);'; // Build the parameters array $params = array (':product_id' => $productId, ':image_name' => $imageName); // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query return DatabaseHandler::Execute($result, $params); } // Changes the name of the product thumbnail file in the database public static function SetThumbnail($productId, $thumbnailName) { // Build the SQL query $sql = 'SELECT catalog_set_thumbnail(:product_id, :thumbnail_name);'; // Build the parameters array $params = array (':product_id' => $productId, ':thumbnail_name' => $thumbnailName); // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query return DatabaseHandler::Execute($result, $params); }

We made two changes to how the network code works: we added a QProgressDialog to give some indication of progress, and added support for Qt Mobility s Bearer Management API to make sure that requests use the correct network in all places. QProgressDialog provides a simple show/hide API that displays the dialog asynchronously when you need it. We create the dialog in the controller s constructor (Listing 5 8), and show it at the beginning of the fetch method using the following line of code:

Best Practice For each main target in the buildfile, add a target-init and a target-clean, where target is

In the data tier, you add the corresponding methods in the Catalog class for the business tier methods you have just seen.

1. Load pgAdmin III, and connect to the hatshop database. 2. Click Tools Query tool (or click the SQL button on the toolbar). A new query window should appear. 3. Use the query tool to execute this code, which creates the catalog_delete_product function to your hatshop database: -- Create catalog_delete_product function CREATE FUNCTION catalog_delete_product(INTEGER) RETURNS VOID LANGUAGE plpgsql AS $$ DECLARE inProductId ALIAS FOR $1; BEGIN DELETE FROM product_category WHERE product_id = inProductId; DELETE FROM product WHERE product_id = inProductId; END; $$; The catalog_delete_product function completely removes a product from the catalog by deleting its entries in the product_category and product tables. 4. Use the query tool to execute this code, which creates the catalog_remove_product_from_category function in your hatshop database: -- Create catalog_remove_product_from_category function CREATE FUNCTION catalog_remove_product_from_category(INTEGER, INTEGER) RETURNS SMALLINT LANGUAGE plpgsql AS $$ DECLARE inProductId ALIAS FOR $1; inCategoryId ALIAS FOR $2; productCategoryRowsCount INTEGER; BEGIN SELECT INTO productCategoryRowsCount count(*) FROM product_category WHERE product_id = inProductId; IF productCategoryRowsCount = 1 THEN PERFORM catalog_delete_product(inProductId); RETURN 0; END IF; DELETE FROM product_category WHERE category_id = inCategoryId AND product_id = inProductId; RETURN 1; END; $$;

the name of the main target. This makes it fairly straightforward to determine the resources needed and created by a target and also makes it easier to maintain large buildfiles. For simple buildfiles a single clean target will usually suffice.

if (mProgressDialog) mProgressDialog->show();

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