ext:typoscript2ce Update script v0.1.0 to v1.0.2

class.ext_update.php

<?php

/**
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

class ext_update {

    /**
     * @var \TYPO3\CMS\Core\Database\DatabaseConnection
     */
    protected $databaseConnection;


    /**
     * Constructor
     */
    public function __construct() {
        $this->databaseConnection = $GLOBALS['TYPO3_DB'];
    }


    /**
     * Called by the extension manager to determine if the update menu entry
     * should by showed.
     *
     * @return bool
     */
    public function access() {
        return TRUE;
    }

    /**
     * Main update function called by the extension manager.
     *
     * @return string
     */
    public function main() {
        $this->renameFlexformField('typoscript2ce_pi1', array('main', 'tsobject'), array('main', 'settings.typoscriptobjectpath'));
    }

    /**
     * Renames a flex form field
     *
     * @param string $pluginName The pluginName used in list_type
     * @param array $oldFieldPointer Pointer array the old field. E.g. array('sheetName', 'fieldName');
     * @param array $newFieldPointer Pointer array the new field. E.g. array('sheetName', 'fieldName');
     * @return void
     */
    protected function renameFlexformField($pluginName, array $oldFieldPointer, array $newFieldPointer) {
        $title = 'Renaming flexform field for "' . $pluginName . '" - ' .
            ' sheet: ' . $oldFieldPointer[0] . ', field: ' . $oldFieldPointer[1] . ' to ' .
            ' sheet: ' . $newFieldPointer[0] . ', field: ' . $newFieldPointer[1];

        $res = $GLOBALS['TYPO3_DB']->exec_SELECTquery('uid, pi_flexform', 'tt_content', 'CType=\'list\' AND list_type=\'' . $pluginName . '\'');

        $flexformTools = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('\TYPO3\CMS\Core\Configuration\FlexForm\FlexFormTools');
        /* @var $flexformTools \TYPO3\CMS\Core\Configuration\FlexForm\FlexFormTools */
        while ($row = $GLOBALS['TYPO3_DB']->sql_fetch_assoc($res)) {

            $xmlArray = \TYPO3\CMS\Core\Utility\GeneralUtility::xml2array($row['pi_flexform']);

            if (!is_array($xmlArray) || !isset($xmlArray['data'])) {
// Something went wrong
            } elseif (!$xmlArray['data'][$oldFieldPointer[0]]) {
// Something went wrong
            } else {
                $updated = false;

                foreach ($xmlArray['data'][$oldFieldPointer[0]] as $language => $fields) {
                    if ($fields[$oldFieldPointer[1]]) {

                        $xmlArray['data'][$newFieldPointer[0]][$language][$newFieldPointer[1]] = $fields[$oldFieldPointer[1]];
                        unset($xmlArray['data'][$oldFieldPointer[0]][$language][$oldFieldPointer[1]]);

                        $updated = true;
                    }
                }

                if ($updated === true) {

                    $GLOBALS['TYPO3_DB']->exec_UPDATEquery('tt_content', 'uid=' . $row['uid'], array(
                        'pi_flexform' => $flexformTools->flexArray2Xml($xmlArray)
                    ));
                }
            }
        }
    }
}

?>

Not perfect (btw!)