[Cache] fix DBAL v3 compat

Author: nicolas-grekas

src/Symfony/Component/Cache/Tests/Traits/PdoPruneableTrait.php

@@ -11,8 +11,6 @@
 
 namespace Symfony\Component\Cache\Tests\Traits;
 
-use Doctrine\DBAL\Driver\Result;
-
 trait PdoPruneableTrait
 {
     protected function isPruned($cache, $name)
@@ -31,6 +29,6 @@ protected function isPruned($cache, $name)
         $select->bindValue(':id', sprintf('%%%s', $name));
         $result = $select->execute();
 
-        return 1 !== (int) ($result instanceof Result ? $result->fetchOne() : $select->fetch(\PDO::FETCH_COLUMN));
+        return 1 !== (int) (\is_object($result) ? $result->fetchOne() : $select->fetch(\PDO::FETCH_COLUMN));
     }
 }

src/Symfony/Component/Cache/Traits/PdoTrait.php

@@ -11,10 +11,8 @@
 
 namespace Symfony\Component\Cache\Traits;
 
-use Doctrine\DBAL\Abstraction\Result;
 use Doctrine\DBAL\Connection;
 use Doctrine\DBAL\DBALException;
-use Doctrine\DBAL\Driver\Result as DriverResult;
 use Doctrine\DBAL\Driver\ServerInfoAwareConnection;
 use Doctrine\DBAL\Schema\Schema;
 use Symfony\Component\Cache\Exception\InvalidArgumentException;
@@ -187,7 +185,7 @@ protected function doFetch(array $ids)
         }
         $result = $stmt->execute();
 
-        if ($result instanceof Result) {
+        if (\is_object($result)) {
             $result = $result->iterateNumeric();
         } else {
             $stmt->setFetchMode(\PDO::FETCH_NUM);
@@ -226,7 +224,7 @@ protected function doHave($id)
         $stmt->bindValue(':time', time(), \PDO::PARAM_INT);
         $result = $stmt->execute();
 
-        return (bool) ($result instanceof DriverResult ? $result->fetchOne() : $stmt->fetchColumn());
+        return (bool) (\is_object($result) ? $result->fetchOne() : $stmt->fetchColumn());
     }
 
     /**
@@ -352,7 +350,7 @@ protected function doSave(array $values, $lifetime)
         foreach ($serialized as $id => $data) {
             $result = $stmt->execute();
 
-            if (null === $driver && !($result instanceof DriverResult ? $result->rowCount() : $stmt->rowCount())) {
+            if (null === $driver && !(\is_object($result) ? $result->rowCount() : $stmt->rowCount())) {
                 try {
                     $insertStmt->execute();
                 } catch (DBALException $e) {