writing the result into the output object instead of just echoing it out.

lib/Doctrine/DBAL/Tools/Console/Command/RunSqlCommand.php

@@ -26,7 +26,7 @@ use Symfony\Component\Console\Input\InputArgument,
 /**
  * Task for executing arbitrary SQL that can come from a file or directly from
  * the command line.
- * 
+ *
  * @license http://www.opensource.org/licenses/lgpl-license.php LGPL
  * @link    www.doctrine-project.org
  * @since   2.0
@@ -71,13 +71,18 @@ EOT
         if ( ! is_numeric($depth)) {
             throw new \LogicException("Option 'depth' must contains an integer value");
         }
-        
+
         if (preg_match('/^select/i', $sql)) {
            $resultSet = $conn->fetchAll($sql);
         } else {
             $resultSet = $conn->executeUpdate($sql);
         }
 
+        ob_start();
         \Doctrine\Common\Util\Debug::dump($resultSet, (int) $depth);
+        $output = ob_get_contents();
+        ob_end_clean();
+
+        $output->write();
     }
 }