Merge PR #106 from @k-webdesign

Fix concurrent unbuffered query dead lock

Author: stefanheimes

src/Migration/AddSortFieldMigration.php

@@ -12,6 +12,7 @@
  *
  * @package    MetaModels/attribute_file
  * @author     Ingolf Steinhardt <[email protected]>
+ * @author     Kim Wormer <[email protected]>
  * @copyright  2012-2022 The MetaModels team.
  * @license    https://github.com/MetaModels/attribute_file/blob/master/LICENSE LGPL-3.0-or-later
  * @filesource
@@ -155,11 +156,13 @@ private function getFileAttributes()
     private function countMissingSortColumns($attributes): int
     {
         $countColumns = 0;
+        $rows         = $attributes->fetchAllAssociative();
 
-        while ($row = $attributes->fetchAssociative()) {
+        foreach ($rows as $row) {
             if ($this->fieldExists($row['tableName'], $row['colname'] . '__sort')) {
                 continue;
             }
+
             $countColumns++;
         }