/**
* Get a PDO instance.
*
* @param string|null $connection Null fetches the default connection.
*
* @return \PDO
*/
public function getPdo($connection = null)
{
if ($connection === null) {
$connection = $this->defaultConnection;
}
if (isset($this->instances[$connection])) {
return $this->instances[$connection];
}
$config = $this->getConnectionConfig($connection);
return $this->instances[$connection] = $this->factory->makePdo($config, $connection);
}
