改进Cache类 及 驱动 改进Connection类及驱动

library/think/db/connector/Sqlite.php

@@ -21,11 +21,11 @@ class Sqlite extends Connection
 
     /**
      * 解析pdo连接的dsn信息
-     * @access public
+     * @access protected
      * @param array $config 连接信息
      * @return string
      */
-    public function parseDsn($config)
+    protected function parseDsn($config)
     {
         $dsn = 'sqlite:' . $config['database'];
         return $dsn;
@@ -78,11 +78,11 @@ class Sqlite extends Connection
 
     /**
      * SQL性能分析
-     * @access public
+     * @access protected
      * @param string $sql
      * @return array
      */
-    public function getExplain($sql)
+    protected function getExplain($sql)
     {
         return [];
     }