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Unless the code in the catch block rethrows the exception, it is assumed that it handled the exception, and the execution of your script continues normally This kind of flexibility allows you to prevent many causes that could make your pages stop working, and you ll appreciate the power exceptions give you when writing PHP code! A PHP 5 exception is represented by the Exception class, which contains the exception s details You can generate (throw) an exception yourself using the throw keyword The Exception object that you throw is propagated through the call stack until it is intercepted using the catch keyword The call stack is the list of methods being executed So if a function A() calls a function B(), which in turn calls a function C(), then the call stack will be formed of these three methods.

The only time I see a mismatch is when one of the following occurs: Catchall classes are used in the presentation layer that make it easy to represent and move objects around in the presentation layer, but they don t actually model the real world at all Denormalized attributes in classes that once again make it easier to work with data in the presentation layer, but don t even remotely represent the cardinality of the real world No time is taken to do a proper analysis It s build a presentation and then create a database that fits it, or restated, shoot, ready, aim! Right Target databases use a different programming language from the presentation layer s object-oriented programming environment, so the database programming language is misunderstood, misused, or ignored altogether Don t take these in any particular order, because there are more reasons than I am willing to list.

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Datasheet view of the list. To modify the list order, see Creating a New View and Modifying an Existing View later in this chapter.

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);.

I seem to remember the same phenomena you know, all the reasons not to adopt better technology years ago when relational technology first appeared, say 1984 So what haven t I told you There are, in fact, a few topics I have not covered yet Let s delve into those next..

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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