public static function singleton()
    {
        $returnValue = null;

        if (!isset(self::$instance)) {
			$c = __CLASS__;
			self::$instance = new $c();
		}
		$returnValue = self::$instance;



        return $returnValue;
    }
public static function singleton()
    {
        $returnValue = null;

        if (!isset(self::$instance)) {
			$c = __CLASS__;
			self::$instance = new $c();
		}
		$returnValue = self::$instance;



        return $returnValue;
    }
public static function singleton ( ) { $ returnValue = null ; if ( ! isset ( self :: $ instance ) ) { $ c = __CLASS__ ; self :: $ instance = new $ c ( ) ; } $ returnValue = self :: $ instance ; return $ returnValue ; }
Entry point.
Enables you to retrieve staticly the DbWrapper instance.

@access public
@author Joel Bout, <joel.bout@tudor.lu>
@throws core_kernel_persistence_Exception
@return core_kernel_classes_DbWrapper
Entry point . Enables you to retrieve staticly the DbWrapper instance .