修改

Mall/Framework/Core/SqlHelper.Class.php

@@ -251,7 +251,7 @@ abstract class SqlHelper
         if($isExport){
             $method = 'exportSelect';
         }
-//         var_dump($sql);
+         var_dump($sql);
         $result = is_null($limit)
             ? $this->db->$method($sql, $data, $this->_fetch_style)
             : $this->db->limit($sql, $limit, $offset, $data, $this->_fetch_style);