Jet\Db_Backend_PDO
This class represents the current default backend directly working with the Jet Db database connection. It fully implements the Jet\Db_Backend_Interface and uses PHP PDO. There is also a Jet\Db_Backend_PDO_Config class that defines the configuration of database connections.
In practice, instances of this class are never created directly in the application space, but always via the Jet\Db::get( $connection_name ) method, which further uses the appropriate factory.