diff -r 5b37998e522e -r 162c1de6545a web/lib/Zend/Db/Statement/Exception.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/Zend/Db/Statement/Exception.php	Fri Mar 11 15:05:35 2011 +0100
@@ -0,0 +1,56 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_Db
+ * @subpackage Statement
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id: Exception.php 20513 2010-01-22 07:55:48Z ralph $
+ */
+
+/**
+ * @see Zend_Db_Exception
+ */
+require_once 'Zend/Db/Exception.php';
+
+/**
+ * Zend_Db_Statement_Exception
+ *
+ * @category   Zend
+ * @package    Zend_Db
+ * @subpackage Statement
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class Zend_Db_Statement_Exception extends Zend_Db_Exception
+{
+    /**
+     * Check if this general exception has a specific database driver specific exception nested inside.
+     *
+     * @return bool
+     */
+    public function hasChainedException()
+    {
+        return ($this->getPrevious() !== null);
+    }
+
+    /**
+     * @return Exception|null
+     */
+    public function getChainedException()
+    {
+        return $this->getPrevious();
+    }
+}