Fix:

1、修改数据库没有数据时不进行缓存

@@ -65,7 +65,7 @@ class Quick extends PDOConnection
             }
         }
         $cacheData = parent::$fun($sql, $parameterMap, $replaceMap);
-        if ($this->_cacheStatus === true) {
+        if ($this->_cacheStatus === true && !empty($cacheData)) {
             if (!empty($this->_cacheTagName)) {
                 $this->dbCache()->tag($this->_cacheTagName)->set($this->_cacheKey, $cacheData, $this->_cacheExpire);
             } else {