An example of a PDOIterator which can be rewound .

lib/Doctrine/DBAL/Connection.php

@@ -19,6 +19,7 @@
 
 namespace Doctrine\DBAL;
 
+use Doctrine\DBAL\Driver\PDOStatementIterator;
 use Doctrine\DBAL\Driver\ServerInfoAwareConnection;
 use Doctrine\DBAL\Exception\InvalidArgumentException;
 use PDO;
@@ -1033,7 +1034,7 @@ class Connection implements DriverConnection
             $logger->stopQuery();
         }
 
-        return $statement;
+        return new PDOStatementIterator($statement);
     }
 
     /**

lib/Doctrine/DBAL/Driver/PDOStatementIterator.php

+<?php
+
+namespace Doctrine\DBAL\Driver;
+
+class PDOStatementIterator implements \Iterator
+{
+    public $stmt;
+    public $cache;
+    public $position = 0;
+
+    public function __construct(\PDOStatement $stmt)
+    {
+        $this->cache = [];
+        $this->position = 0;
+        $this->stmt = $stmt;
+        $this->next();
+    }
+
+    public function rewind()
+    {
+        $this->position = 0;
+    }
+
+    public function valid()
+    {
+        return isset($this->cache[$this->position]);
+    }
+
+    public function current()
+    {
+        return $this->cache[$this->position];
+    }
+
+    public function key()
+    {
+        return $this->position;
+    }
+
+    public function next()
+    {
+        if ($this->valid()) {
+            $this->cache[$this->position];
+            $this->position++;
+        } else {
+            $this->cache[$this->position] = $this->stmt->fetch();
+            $this->position++;
+        }
+
+    }
+
+    public function __call($name, $arguments)
+    {
+        return call_user_func_array([$this->stmt, $name], $arguments);
+    }
+}