TYPO3 v15 dev-main snapshot ()

Classes/Database/Middleware/CustomPdoDriverResultMiddleware.php

@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * 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!
+ */
+
+namespace TYPO3\CMS\Core\Database\Middleware;
+
+use Doctrine\DBAL\Driver as DoctrineDriver;
+use Doctrine\DBAL\Driver\Middleware as DoctrineDriverMiddleware;
+use TYPO3\CMS\Core\Database\Driver\CustomPdoResultDriverDecorator;
+
+/**
+ * The `php-ext PDO` based pdo_* driver can return column data in query result sets as type `resource`, where the
+ * `mysqli` based driver returns type `string` instead. Dealing with data of type `resources`, for special driver,
+ * is not a well known technical detail in the broader php and TYPO3 developer community. Therefore, the TYPO3 core
+ * provided custom pdo_* driver implementation to provide a specific `DriverResult` class, which resolves this issue
+ * by converting type `resource` column data directly to string in `\TYPO3\CMS\Core\Database\Driver\DriverResult`
+ * within the method `mapResourceToString()` and uses it in the related methods.
+ *
+ * With the Doctrine DBAL Driver Middleware features the custom drivers could be reduced and the required DriverResult
+ * set added in a cleaner way. As this comes with minor performance impact, the custom DriverResult set needs to be
+ * plumbed only to the absolutely required drivers - and the reason for the conditional usage restricted with method
+ * `canBeUsedForConnection()`.
+ *
+ * @see \TYPO3\CMS\Core\Database\Driver\DriverResult::mapResourceToString()
+ *
+ * @internal this implementation is not part of TYPO3's Public API.
+ */
+final class CustomPdoDriverResultMiddleware implements DoctrineDriverMiddleware, UsableForConnectionInterface
+{
+    public function wrap(DoctrineDriver $driver): DoctrineDriver
+    {
+        return new CustomPdoResultDriverDecorator($driver);
+    }
+
+    public function canBeUsedForConnection(string $identifier, array $connectionParams): bool
+    {
+        return match ($connectionParams['driver'] ?? '') {
+            'pdo_sqlite', 'pdo_pgsql', 'pdo_mysql' => true,
+            default => false,
+        };
+    }
+}