/**
* $configuration may contain following keys:
* <ul>
* <li>host
* <li>database
* <li>login
* <li>password
* <li>initCommand
* <li>options
* <li>engine
* </ul>
*
* @param array $configuration Array of Name => Value pairs.
*/
public function __construct(array $configuration)
{
parent::__construct($configuration);
$this->engine = isset($configuration['engine']) ? $configuration['engine'] : "";
}
