diff --git a/Classes/Domain/Repository/PostRepository.php b/Classes/Domain/Repository/PostRepository.php
index 2b24afbc..ca3d7f0f 100644
--- a/Classes/Domain/Repository/PostRepository.php
+++ b/Classes/Domain/Repository/PostRepository.php
@@ -9,7 +9,7 @@
  * LICENSE.txt file that was distributed with this source code.
  */
 
-use TYPO3\CMS\Core\Database\Connection;
+use Doctrine\DBAL\ParameterType;
 use TYPO3\CMS\Core\Database\Query\Restriction\DeletedRestriction;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Extbase\Persistence\QueryInterface;
@@ -70,7 +70,7 @@ public function findByLocalizedUid(int $uid, bool $respectEnableFields = true):
             ->where(
                 $queryBuilder->expr()->eq(
                     'uid',
-                    $queryBuilder->createNamedParameter($uid, Connection::PARAM_INT)
+                    $queryBuilder->createNamedParameter($uid, ParameterType::PARAM_INT)
                 ),
             )
             ->setMaxResults(1)
diff --git a/Classes/Hooks/Tcemain.php b/Classes/Hooks/Tcemain.php
index 43eaab9c..a86b904a 100644
--- a/Classes/Hooks/Tcemain.php
+++ b/Classes/Hooks/Tcemain.php
@@ -9,6 +9,7 @@
  * LICENSE.txt file that was distributed with this source code.
  */
 
+use Doctrine\DBAL\ParameterType;
 use FelixNagel\T3extblog\Domain\Model\Comment;
 use FelixNagel\T3extblog\Domain\Repository\CommentRepository;
 use FelixNagel\T3extblog\Service\CommentNotificationService;
@@ -192,7 +193,7 @@ protected function getDeleteArrayForTable(int $postId, string $tableName, string
             ->add(GeneralUtility::makeInstance(DeletedRestriction::class));
 
         $constraints = [
-            $queryBuilder->expr()->eq($fieldName, $queryBuilder->createNamedParameter($postId, \PDO::PARAM_INT))
+            $queryBuilder->expr()->eq($fieldName, $queryBuilder->createNamedParameter($postId, ParameterType::INTEGER))
         ];
 
         if ($tableName === 'tt_content') {
@@ -207,7 +208,7 @@ protected function getDeleteArrayForTable(int $postId, string $tableName, string
             ->from($tableName)
             ->where(CompositeExpression::and(...$constraints));
 
-        $rows = $queryBuilder->execute()->fetchAll();
+        $rows = $queryBuilder->fetchAllAssociative();
 
         foreach ($rows as $record) {
             $command[$record['uid']]['delete'] = 1;
diff --git a/Classes/UpgradeWizard/AbstractSlugUpgradeWizard.php b/Classes/UpgradeWizard/AbstractSlugUpgradeWizard.php
index 9eea9cf6..eecacd1e 100644
--- a/Classes/UpgradeWizard/AbstractSlugUpgradeWizard.php
+++ b/Classes/UpgradeWizard/AbstractSlugUpgradeWizard.php
@@ -9,6 +9,7 @@
  * LICENSE.txt file that was distributed with this source code.
  */
 
+use Doctrine\DBAL\ParameterType;
 use TYPO3\CMS\Core\Database\Query\QueryBuilder;
 use TYPO3\CMS\Core\DataHandling\SlugHelper;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
@@ -54,7 +55,9 @@ protected function createMissingSlugs(
 
         foreach ($rows as $row) {
             $queryBuilder
-                ->update($table)->where($constraint, $queryBuilder->expr()->eq('uid', $queryBuilder->createNamedParameter($row['uid'], \PDO::PARAM_INT)))
+                ->update($table)->where($constraint, $queryBuilder->expr()->eq(
+                    'uid', $queryBuilder->createNamedParameter($row['uid'], ParameterType::INTEGER)
+                ))
                 ->set($slug, $slugService->generate($row, $row['pid']))
                 ->executeStatement();
         }
diff --git a/Classes/UpgradeWizard/CommentAuthorOrEmailValid.php b/Classes/UpgradeWizard/CommentAuthorOrEmailValid.php
index 2acb647a..e33306ed 100644
--- a/Classes/UpgradeWizard/CommentAuthorOrEmailValid.php
+++ b/Classes/UpgradeWizard/CommentAuthorOrEmailValid.php
@@ -39,7 +39,7 @@ protected function findCommentAuthorOrEmailInvalid(): bool
                 )
             );
 
-        $rows = $queryBuilder->execute()->fetchAll();
+        $rows = $queryBuilder->fetchAllAssociative();
 
         if (count($rows) === 0) {
             $this->output->writeln('All comment records look valid. Good job!');
diff --git a/Classes/UpgradeWizard/CommentUrlValidation.php b/Classes/UpgradeWizard/CommentUrlValidation.php
index 4d5e8203..1d432c2a 100644
--- a/Classes/UpgradeWizard/CommentUrlValidation.php
+++ b/Classes/UpgradeWizard/CommentUrlValidation.php
@@ -38,7 +38,7 @@ protected function findCommentRecordsForUrlValidation(): bool
                 $queryBuilder->expr()->notLike('website', $queryBuilder->createNamedParameter('https%'))
             );
 
-        $rows = $queryBuilder->execute()->fetchAll();
+        $rows = $queryBuilder->fetchAllAssociative();
 
         if (count($rows) === 0) {
             $this->output->writeln('All comment URLs look valid. Good job!');
diff --git a/Classes/Utility/BlogPageSearchUtility.php b/Classes/Utility/BlogPageSearchUtility.php
index 89ef3eb3..6911c9d0 100644
--- a/Classes/Utility/BlogPageSearchUtility.php
+++ b/Classes/Utility/BlogPageSearchUtility.php
@@ -9,6 +9,7 @@
  * LICENSE.txt file that was distributed with this source code.
  */
 
+use Doctrine\DBAL\ParameterType;
 use TYPO3\CMS\Core\Database\ConnectionPool;
 use TYPO3\CMS\Core\SingletonInterface;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
@@ -60,10 +61,10 @@ protected static function getBlogModulePages(): array
             ->from($table)
             ->where(
                 $queryBuilder->expr()->eq('module', $queryBuilder->createNamedParameter('t3blog')),
-                $queryBuilder->expr()->eq('sys_language_uid', $queryBuilder->createNamedParameter(0, \PDO::PARAM_INT))
+                $queryBuilder->expr()->eq('sys_language_uid', $queryBuilder->createNamedParameter(0, ParameterType::INTEGER))
             );
 
-        return $queryBuilder->execute()->fetchAll();
+        return $queryBuilder->fetchAllAssociative();
     }
 
     protected static function getPagesWithBlogRecords(string $joinTable): array
@@ -85,7 +86,7 @@ protected static function getPagesWithBlogRecords(string $joinTable): array
             )
         );
 
-        return $queryBuilder->execute()->fetchAll();
+        return $queryBuilder->fetchAllAssociative();
     }
 
     /**