DbException::__construct

public function __construct($message = "", $databaseMessage = "", Exception $previous = null)
{
	if (($message != "") && ($databaseMessage != ""))
		$message .= ": ".$databaseMessage;
	elseif (($message == "") && ($databaseMessage != ""))
		$message = $databaseMessage;

	$this->databaseMessage = $databaseMessage;

	parent::__construct($message, 400, '', '', $previous);
}