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I have the following Magento 1 code and I would like to know the Magento 2 equivalent of the code.

I've looked around on the web but unable to find a proper solution.

Mage::getModel('core/resource_transaction');

Below way is equivallent of magento 1 to magento 2,

 <?php
 public function __construct(
 MagentoFrameworkDBTransaction $transactionFactory
 ) 
 $this->_transactionFactory = $transactionFactory; 
 

After declared as above use inside funtion,

$invoice = "Your Custom Object";
$this->_transactionFactory->addObject($invoice);

Remove var folder from root and check,

/**
 * TransactionFactory
 *
 * @var MagentoFrameworkDBTransactionFactory
 */
 protected $_transactionFactory;

public function __construct(
MagentoFrameworkDBTransactionFactory $transactionFactory
) 
 $this->_transactionFactory = $transactionFactory;

// now you can use this like,

$saveTransaction = $this->_transactionFactory->create();

$saveTransaction->addObject('YOUR_OBJECT_1');
$saveTransaction->addObject('YOUR_OBJECT_2');
$saveTransaction->save();

you can also use delete() method If you want instead of save()

I got the error with Fatal error: Uncaught Exception: User Error: Some transactions have not been committed or rolled back in /public_html/vendor/magento/framework/DB/Adapter/Pdo/Mysql.php on line 3769 in /public_html/vendor/magento/framework/App/ErrorHandler.php:61 Stack trace: #0 [internal function]: MagentoFrameworkAppErrorHandler->handler(256, 'Some transactio...', '/home/...', 3769, Array) #1 /public_html/vendor/magento/framework/DB/Adapter/Pdo/Mysql.php(3769): trigger_error('Some transactio...', 256) #2 [internal function]: MagentoFrameworkDBAdapterPdoMysql->__destruct() #3 main thrown in /public_html/vendor/magento/framework/App/ErrorHandler.php on line 61