diff -r 000000000000 -r 4eba9c11703f web/Zend/Db/Expr.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/Zend/Db/Expr.php	Mon Dec 13 18:29:26 2010 +0100
@@ -0,0 +1,77 @@
+<?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 Expr
+ * @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: Expr.php 20096 2010-01-06 02:05:09Z bkarwin $
+ */
+
+
+/**
+ * Class for SQL SELECT fragments.
+ *
+ * This class simply holds a string, so that fragments of SQL statements can be
+ * distinguished from identifiers and values that should be implicitly quoted
+ * when interpolated into SQL statements.
+ *
+ * For example, when specifying a primary key value when inserting into a new
+ * row, some RDBMS brands may require you to use an expression to generate the
+ * new value of a sequence.  If this expression is treated as an identifier,
+ * it will be quoted and the expression will not be evaluated.  Another example
+ * is that you can use Zend_Db_Expr in the Zend_Db_Select::order() method to
+ * order by an expression instead of simply a column name.
+ *
+ * The way this works is that in each context in which a column name can be
+ * specified to methods of Zend_Db classes, if the value is an instance of
+ * Zend_Db_Expr instead of a plain string, then the expression is not quoted.
+ * If it is a plain string, it is assumed to be a plain column name.
+ *
+ * @category   Zend
+ * @package    Zend_Db
+ * @subpackage Expr
+ * @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_Expr
+{
+    /**
+     * Storage for the SQL expression.
+     *
+     * @var string
+     */
+    protected $_expression;
+
+    /**
+     * Instantiate an expression, which is just a string stored as
+     * an instance member variable.
+     *
+     * @param string $expression The string containing a SQL expression.
+     */
+    public function __construct($expression)
+    {
+        $this->_expression = (string) $expression;
+    }
+
+    /**
+     * @return string The string of the SQL expression stored in this object.
+     */
+    public function __toString()
+    {
+        return $this->_expression;
+    }
+
+}