Db::getConnection() 

\nn\t3::Db()->getConnection(); 

Get a "raw" connection to the database. Only useful in really exceptional cases.

$connection = \nn\t3::Db()->getConnection();
$connection->fetchAll( 'SELECT FROM tt_news WHERE 1;' );
Copied!

| @return \TYPO3\CMS\Core\Database\Connection

Source Code 

public function getConnection()
{
	$connectionPool = GeneralUtility::makeInstance(ConnectionPool::class);
	$connectionName = array_shift($connectionPool->getConnectionNames());
	return $connectionPool->getConnectionByName( $connectionName );
}
Copied!