diff --git a/model/SqlCriteria.php b/model/SqlCriteria.php
index 3da0777..106cf9e 100644
--- a/model/SqlCriteria.php
+++ b/model/SqlCriteria.php
@@ -134,7 +134,7 @@ class SqlCriteria
      */
     public function select($fields)
     {
-        $fields = explode(',', $fields);
+        $fields = array_map(function($item){return trim($item);},explode(',', $fields));
         $this->select = array_merge($this->select,$fields);
         return $this;
     }