DiscountTable::setAllUseCoupons

static function setAllUseCoupons($use)
{
	$use = (string)$use;
	if ($use !== 'Y' && $use !== 'N')
		return;
	$conn = Application::getConnection();
	$helper = $conn->getSqlHelper();
	$conn->queryExecute(
		'update '.$helper->quote(self::getTableName()).' set '.$helper->quote('USE_COUPONS').' = ''.$use.'''
	);
	unset($helper, $conn);
}