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In this scenario, an exception that is raised in function C() can be handled in the same function, provided the offending code is inside a try-catch block If this is not the case, the exception propagates to method B(), which has a chance to handle the exception, and so on If no method handles the exception, the exception is finally intercepted by the PHP interpreter, which transforms the exception into a PHP fatal error In our database handling code, we ll catch the potential exceptions that could be generated by PDO Although it doesn t do it by default, PDO can be instructed to generate exceptions in case something goes wrong when executing an SQL command or opening a database connection, like this: // Create a new PDO class instance $handler = new PDO( .. ); // Configure PDO to throw exceptions self::$_mHandler->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);.

We catch these exceptions, and we pass the error details to the error-handling code you wrote in 2. The following code snippet shows a short function with this functionality implemented: // 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; }

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book). Select a location and save the files on your PC. That s it. Copy the files to your device and you re ready to go. TIP: When exporting to Flash, make sure to copy all the files to your device. There are a number of files created, including images, XML files, and a SWF file. Make sure to copy all of these to your device. Just click to run.

interactive Web applications AJAX is being defined even as you read this text The combination of these technologies has been referred to as DHTML and remote scripting in the past Many claim that AJAX is a new name for old things that have been around for almost the last 10 years, while others point out that it is the evolution and the synergistic usage of these technologies that is new The even newer term Web 20 is being used to refer to AJAX and other technologies that are taking the Web user experience and capabilities to a new level The impact of websites like Google Maps, Google Suggest, Gmail, Flickr, Amazon s A9, and the many spin-offs and clones that their success have created are being used as the foundation to define AJAX.

After opening the connection, you re now at the stage we ve been aiming for from the start: executing SQL commands through the connection. You can execute the command in many ways, depending on the specifics. Does the SQL query you want to execute return any data If so, what kind of data, and in which format The PDO methods that we ll use to execute SQL queries are PDOStatement::execute is used to execute an INSERT, an UPDATE, or DELETE query. PDOStatement::fetch is used to retrieve one row of data from the database. PDOStatement::fetchAll is used to retrieve multiple rows of data from the database. PDO::prepare prepares an SQL query to be executed, creating a so-called prepared statement. A prepared statement is a parameterized SQL query whose parameter values are replaced by either parameter markers ( ) or named variables (:variable_name), like in these examples: $query1 = "SELECT name FROM department WHERE department_id = " $query1 = "SELECT name FROM department WHERE department_id = :dept_id"

To execute a prepared statement, you supply the parameter values to the functions that execute your query, which take care to build the complete SQL query for you. To implement the list of departments, you won t need to work with parameters, but you ll learn how to handle them in 4. Nonprepared statements can be executed with PDO using the PDO::exec, in which case, you need to create the string of the SQL query, including its parameters. In this book, we ll always use prepared statements because they bring two important benefits: Parameter values are checked to prevent injection attacks. The query will likely execute faster with prepared statements because the database server can reuse the access plan it builds for a prepared statement. To be able to reuse more of the database handling code and to have a centralized errorhandling mechanism for the database code, we won t be using the PDO methods directly from the business tier of our application. Instead, we ll wrap the PDO functionality into a class named DatabaseHandler, and we ll use this class from the other classes of the business tier.

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