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The PDO class provides the functionality to connect to the PostgreSQL server and execute SQL queries. The function that opens a database connection is PDO s constructor, which receives as parameters the connection string to the database server and an optional parameter that specifies whether the connection is a persistent connection. The connection string contains the data required to connect to the database server. You create a new PDO object like this: $dbh = new PDO('pgsql:dbname=' . $db_name . ';host=' . $db_host, $db_user, $db_pass, array(PDO::ATTR_PERSISTENT => $persistent));
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Note The constructor of the PDO class returns an initialized database connection object (which is specific
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to the type of database you re connecting to, such as pgsql) if the connection is successful; otherwise, an exception is thrown.
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The previous code snippet shows the standard data you need to supply when connecting to a PostgreSQL server and uses five variables: $db_user represents the username. $db_pass represents the user s password. $db_host is the hostname of your PostgreSQL server. $db_name is the name of the database you re connecting to. $persistent is true if we want to create a persistent database connection or false otherwise. To disconnect from the database, you need to make $dbh = null. The following code snippet demonstrates how to create, open, and then close a PostgreSQL database connection and also catch any exceptions that are thrown: try { // Open connection $dbh = new PDO('pgsql:dbname=' . $db_name . ';host=' . $db_host, $db_user, $db_pass); // Close connection $dbh = null; } catch (PDOException $e) { echo 'Connection failed: ' . $e->getMessage(); } The try and catch keywords are used to handle exceptions.
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In 2, you implemented the code that intercepts and handles (and eventually reports) errors that happen in the HatShop site. PHP errors are the standard mechanism that you can use to react with an error happening in your PHP code. When a PHP error occurs, the execution stops; you can, however, define an error-handling function that is called just before the execution is terminated. You added such a function in 2, where you obtain as many details as possible about the error and log them for future reference. Having those details, a programmer can fix the code to avoid the same error happening in the future. PHP 5 introduced, along with other OOP features, a new way to handle runtime errors: enter exceptions. Exceptions represent the modern way of managing runtime errors in your code and are much more powerful and flexible than PHP errors. Exceptions are a very important part of the OO (Object Oriented) model, and PHP 5 introduces an exception model resembling that of other OOP languages such as Java and C#. However, exceptions in PHP coexist with the standard PHP errors in a strange combination, and you can t solely rely on exceptions for dealing with runtime problems. Some PHP extensions, such as PDO, can be configured to generate exceptions to signal problems that happen at runtime, whereas in other cases, your only option is to deal with standard PHP errors.
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The advantages of exceptions over errors lies in the flexibility you re offered in handling them. When an exception is generated, you can handle it locally and let your script continue executing normally, or you can pass the exception to another class for further processing. With exceptions, your script isn t terminated like what happens when a PHP error appears. When using exceptions, you place the code that you suspect could throw an exception inside a try block and handle potential exceptions in an associated catch block: try { // Code that could generate an exception that you want to handle } catch (Exception $e) { // Code that is executed when an exception is generated // (exception details are accessible through the $e object) } When an exception is generated by any of the code in the try block, the execution is passed directly to the catch block. 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. 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);
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