ConnectionFactory.php

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<?php
namespace Magento\Analytics\ReportXml;

use Magento\Framework\App\ResourceConnection;
use Magento\Framework\ObjectManagerInterface;
use Magento\Framework\DB\Adapter\AdapterInterface;

class ConnectionFactory
{
    private $resourceConnection;

    private $objectManager;

    public function __construct(
        ResourceConnection $resourceConnection,
        ObjectManagerInterface $objectManager
    ) {
        $this->resourceConnection = $resourceConnection;
        $this->objectManager = $objectManager;
    }

    public function getConnection($connectionName)
    {
        $connection = $this->resourceConnection->getConnection($connectionName);
        $connectionClassName = get_class($connection);
        $configData = $connection->getConfig();
        $configData['use_buffered_query'] = false;
        unset($configData['persistent']);
        return $this->objectManager->create(
            $connectionClassName,
            [
                'config' => $configData
            ]
        );
    }
}