Index: Select.php
===================================================================
--- Select.php	(revision 11943)
+++ Select.php	(working copy)
@@ -22,11 +22,6 @@
 
 
 /**
- * @see Zend_Db_Adapter_Abstract
- */
-require_once 'Zend/Db/Adapter/Abstract.php';
-
-/**
  * @see Zend_Db_Expr
  */
 require_once 'Zend/Db/Expr.php';
@@ -87,6 +82,13 @@
      * @var Zend_Db_Adapter_Abstract
      */
     protected $_adapter;
+    /**
+     * Wither or not that object is connected to
+     * the adapter
+     *
+     * @var bool
+     */
+    protected $_connected = true;
 
     /**
      * The initial values for the $_parts array.
@@ -1225,4 +1227,46 @@
         return $sql;
     }
 
+    /**
+     * called when object is getting serialized
+     * 
+     * @return array
+     *
+     */
+    public function __sleep()
+    {
+        return array_keys(array_diff_key(get_object_vars($this), array('_adapter'=>false)));
+    }
+
+    /**
+     * called when object is getting unserialized
+     * 
+     * @return void
+     */
+    public function __wakeup()
+    {
+        if (Zend_Registry::isRegistered('Zend_Db_Adapter') &&
+             Zend_Registry::get('Zend_Db_Adapter') instanceof Zend_Db_Adapter_Abstract) {
+            $this->_adapter = Zend_Registry::get('Zend_Db_Adapter');
+        } else {
+            $this->_connected = false;
+        }
+    }
+
+    /**
+     * Attach a Db adapter to this instance
+     *
+     * @param Zend_Db_Adapter_Abstract $adapter
+     * @throws Zend_Db_Select_Exception
+     * @return void
+     */
+    public function setAdapter(Zend_Db_Adapter_Abstract $adapter)
+    {
+        if ($this->_connected === false) {
+            require_once 'Zend/Db/Select_Exception.php';
+            throw new Zend_Db_Select_Exception("Select object already has an adapter");
+        }
+        $this->_adapter = $adapter;
+        $this->_connected = true;
+    }
 }