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@Bujhm /pattern singleton in PDO.php

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paul dot maddox at gmail dot com 27-Aug-2009 12:54
I decided to create a singleton wrapper for PDO that ensures only one instance is ever used.
It uses PHP 5.3.0's __callStatic functionality to pass on statically called methods to PDO.
This means you can just call it statically from anywhere without having to initiate or define the object.
Usage examples:
DB::exec("DELETE FROM Blah");
foreach( DB::query("SELECT * FROM Blah") as $row){
class DB {
private static $objInstance;
* Class Constructor - Create a new database connection if one doesn't exist
* Set to private so no-one can create a new instance via ' = new DB();'
private function __construct() {}
* Like the constructor, we make __clone private so nobody can clone the instance
private function __clone() {}
* Returns DB instance or create initial connection
* @param
* @return $objInstance;
public static function getInstance( ) {
self::$objInstance = new PDO(DB_DSN, DB_USER, DB_PASS);
self::$objInstance->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
return self::$objInstance;
} # end method
* Passes on any static calls to this class onto the singleton PDO instance
* @param $chrMethod, $arrArguments
* @return $mix
final public static function __callStatic( $chrMethod, $arrArguments ) {
$objInstance = self::getInstance();
return call_user_func_array(array($objInstance, $chrMethod), $arrArguments);
} # end method
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