Migrate DCE Image Field to FAL

BranchenbuchCommand.php

/** @var \TYPO3\CMS\Core\Database\Query\QueryBuilder $queryBuilder */
        $queryBuilder = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Database\ConnectionPool::class)
            ->getQueryBuilderForTable('tt_content');

        $elements = $queryBuilder->select('*')->from('tt_content')
            ->where(
                $queryBuilder->expr()->andX(
                    $queryBuilder->expr()->eq('CType', $queryBuilder->createNamedParameter('dce_dceuid1')),
                    $queryBuilder->expr()->eq('deleted', $queryBuilder->createNamedParameter('0'))
                )
            )->execute()->fetchAll();

        if($elements) {

            /** @var \TYPO3\CMS\Core\Service\FlexFormService $flexFormUtility */
            $flexFormUtility = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Service\FlexFormService::class);

            /** @var \TYPO3\CMS\Core\Configuration\FlexForm\FlexFormTools $flexFormTools */
            $flexFormTools = GeneralUtility::makeInstance(\TYPO3\CMS\Core\Configuration\FlexForm\FlexFormTools::class);
            /** @var \TYPO3\CMS\Core\Resource\ResourceFactory $resourceFactory */
            $resourceFactory = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Resource\ResourceFactory::class);

            $storage = $resourceFactory->getStorageObject(11);

            /** @var DataHandler $dataHandler */
            $dataHandler = GeneralUtility::makeInstance(DataHandler::class);

            foreach ($elements as $element) {
                $flexform = $flexFormUtility->convertFlexFormContentToArray($element['pi_flexform']);
                if(true === isset($flexform['settings']['image'])) {
                    if(true === $storage->hasFile('/' . $flexform['settings']['image'])) {

                        $file = $storage->getFile('/' . $flexform['settings']['image']);

                        $newFlexForm = GeneralUtility::xml2array($element['pi_flexform']);

                        $newFlexForm['data']['sheet.tabGeneral']['lDEF']['settings.dceimage'] = [
                            'vDEF' => 1
                        ];

                        $newFlexForm = $flexFormTools->flexArray2Xml($newFlexForm);

                        $newId = 'NEW1234';
                        $data = array();
                        $data['sys_file_reference'][$newId] = array(
                            'table_local' => 'sys_file',
                            'uid_local' => $file->getUid(),
                            'tablenames' => 'tt_content',
                            'uid_foreign' => $element['uid'],
                            'fieldname' => 'dceimage',
                            'pid' => $element['pid']
                        );

                        $queryBuilder->update('tt_content')
                            ->set('pi_flexform', $newFlexForm)
                            ->where(
                                $queryBuilder->expr()->eq('uid', $queryBuilder->createNamedParameter($element['uid']))
                            )->execute();

                        $dataHandler->start($data, array());
                        $dataHandler->process_datamap();

                    }
                }
            }
        }