Get MySQL error code with Doctrine DBAL

gistfile1.php

<?php


    protected function executeQueryBuilder($queryBuilder, string $debugHeader)
    {
        $resource = null;
        try {
            $resource = $queryBuilder->execute();
        } catch (\Doctrine\DBAL\DBALException $e) {
            $previous = $e->getPrevious();
            if ($previous instanceof \Doctrine\DBAL\Driver\Mysqli\MysqliException) {
                // $errorCode contains MySQL error code (ex: 1062 for a duplicate entry)
                $errorCode = $previous->getCode();
                $errorMsg = $previous->getMessage();
                # DebuggerUtility::var_dump(['$queryBuilder' => $queryBuilder, '$errorCode' => $errorCode, '$errorMsg' => $errorMsg], $debugHeader);
                var_dump([$debugHeader, '$errorCode' => $errorCode, '$errorMsg' => $errorMsg]);
            }
        }
        return $resource;
    }