ReadRow.php

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<?php
namespace Magento\Framework\EntityManager\Db;

use Magento\Framework\App\ResourceConnection;
use Magento\Framework\EntityManager\MetadataPool;

class ReadRow
{
    private $metadataPool;

    private $resourceConnection;

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

    public function execute($entityType, $identifier, $context = [])
    {
        $metadata = $this->metadataPool->getMetadata($entityType);
        $connection = $this->resourceConnection->getConnectionByName($metadata->getEntityConnectionName());
        $select = $connection->select()
            ->from(['t' => $metadata->getEntityTable()])
            ->where($metadata->getIdentifierField() . ' = ?', $identifier);
        foreach ($context as $field => $value) {
            $select->where(
                $connection->quoteIdentifier($field) . ' = ?',
                $value
            );
        }
        $data = $connection->fetchRow($select);
        return $data ?: [];
    }
}