一些功能

app/models/store/StoreExchange.php

@@ -79,6 +79,7 @@ class StoreExchange extends BaseModel
             ->order('sort DESC,add_time DESC');
         $model = $model->limit($offset, $limit);
         $list = $model->select();
+        var_dump(self::getLastSql());
         if ($list) return $list->toArray();
         else return [];
     }