Support foreign keys with SQLite (#590)

src/Doctrine/SqliteSessionInitSubscriber.php

@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Doctrine;
+
+use Doctrine\Common\EventSubscriber;
+use Doctrine\DBAL\Event\ConnectionEventArgs;
+use Doctrine\DBAL\Events;
+
+class SqliteSessionInitSubscriber implements EventSubscriber
+{
+    /**
+     * @param ConnectionEventArgs $args
+     * @throws \Doctrine\DBAL\DBALException
+     */
+    public function postConnect(ConnectionEventArgs $args)
+    {
+        if ('sqlite' !== strtolower($args->getDatabasePlatform()->getName())) {
+            return;
+        }
+        $args->getConnection()->executeUpdate('PRAGMA foreign_keys = ON;');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getSubscribedEvents()
+    {
+        return [Events::postConnect];
+    }
+}