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5. Add the Execute method to DatabaseHandler. This method uses the PDOStatement::execute method to run queries that don t return records (INSERT, DELETE, or UPDATE queries): // Wrapper method for PDOStatement::execute public static function Execute($statementHandler, $params = null) { try { // Try to execute the query $statementHandler->execute($params); } catch(PDOException $e) { // Close the database handler and trigger an error self::Close(); trigger_error($e->getMessage(), E_USER_ERROR); } } 6. Add the GetAll function, which is the wrapper method for fetchAll. You ll call this function for retrieving a complete result set from a SELECT query. // Wrapper method for PDOStatement::fetchAll public static function GetAll($statementHandler, $params = null, $fetchStyle = PDO::FETCH_ASSOC) { // Initialize the return value to null $result = null; // Try executing the prepared statement received as parameter try { self::Execute($statementHandler, $params); $result = $statementHandler->fetchAll($fetchStyle); } catch(PDOException $e) { // Close the database handler and trigger an error self::Close(); trigger_error($e->getMessage(), E_USER_ERROR); } // Return the query results return $result; }

Consider all possible display resolutions and dimensions when designing the visuals for your application. Test on real devices as much as possible.

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7. Add the GetRow function, which is the wrapper class for fetchRow, as shown. This will be used to get a row of data resulted from a SELECT query. // Wrapper method for PDOStatement::fetch public static function GetRow($statementHandler, $params = null, $fetchStyle = PDO::FETCH_ASSOC) { // Initialize the return value to null $result = null; // Try executing the prepared statement received as parameter try { self::Execute($statementHandler, $params); $result = $statementHandler->fetch($fetchStyle); } catch(PDOException $e) { // Close the database handler and trigger an error self::Close(); trigger_error($e->getMessage(), E_USER_ERROR); } // Return the query results return $result; } 8. Add the GetOne function, which is the wrapper class for fetch, as shown. This will be used to get a single value resulted from a SELECT query. // Return the first column value from a row public static function GetOne($statementHandler, $params = null) { // Initialize the return value to null $result = null; // Try executing the prepared statement received as parameter try { /* Execute the query, and save the first value of the result set (first column of the first row) to $result */ self::Execute($statementHandler, $params); $result = $statementHandler->fetch(PDO::FETCH_NUM); $result = $result[0]; } catch(PDOException $e) {

By far the easiest way to get started with Tacos is to use the demo WAR file as a skeleton for your WAR archive. Figure 7-21 shows the location of the different Tacos elements in the TechConf tapestry-web directory (the template directory for the WAR file). Figure 7-21 also shows the structure and location of the Tapestry page and component specification, as well as the HTML templates. To get acquainted with Tacos, I recommend test-driving the Demo application. You can access the demo application online, or better yet, you can simply deploy the demo WAR file in Tomcat or JBoss. Figure 7-22 shows the Tacos demo application running under Tomcat.

// Close the database handler and trigger an error self::Close(); trigger_error($e->getMessage(), E_USER_ERROR); } // Return the query results return $result; } 9. Create a file named catalog.php inside the business folder. Add the following code into this file: < php // Business tier class for reading product catalog information class Catalog { // Retrieves all departments public static function GetDepartments() { // Build SQL query $sql = 'SELECT * FROM catalog_get_departments_list();'; // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query and return the results return DatabaseHandler::GetAll($result); } } > 10. You need to include the newly created database_handler.php in app_top.php so you can make the class available for the application. To do this, add the highlighted code to the include/app_top.php file: < php // Include utility files require_once 'include/config.php'; require_once BUSINESS_DIR . 'error_handler.php'; // Sets the error handler ErrorHandler::SetHandler(); // Load the page template require_once PRESENTATION_DIR . 'page.php'; // Load the database handler require_once BUSINESS_DIR . 'database_handler.php'; >

Design your UI to be scalable. Strive to support different screen dimensions to support multiple current and future devices. Use platform components as much as possible. This not only helps ensure that your application will scale automatically, but also ensures that you are using the common design language expressed by the platform-common components.

Figure 7-22 also shows the Tacos Debug Console, which is a very useful tool for debugging Tacos-based AJAX applications.

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