Index: library/Zend/Db/Adapter/Abstract.php
===================================================================
--- library/Zend/Db/Adapter/Abstract.php	(revision 14591)
+++ library/Zend/Db/Adapter/Abstract.php	(working copy)
@@ -428,6 +428,23 @@
     }
 
     /**
+     * Executes an SQL statement and return the number of affected rows
+     *
+     * @param  mixed  $sql  The SQL statement with placeholders.
+     *                      May be a string or Zend_Db_Select.
+     * @return Zend_Db_Statement_Interface
+     */
+    public function exec($sql)
+    {
+        // is the $sql a Zend_Db_Select object?
+        if ($sql instanceof Zend_Db_Select) {
+            $sql = $sql->assemble();
+        }
+
+        return $this->getConnection()->exec($sql);
+    }
+
+    /**
      * Prepares and executes an SQL statement with bound data.
      *
      * @param  mixed  $sql  The SQL statement with placeholders.