diff --git a/convention.php b/convention.php
index 9d86e2f6..138cb4f7 100644
--- a/convention.php
+++ b/convention.php
@@ -180,8 +180,6 @@ return [
     // | 数据库设置
     // +----------------------------------------------------------------------
 
-    'db_fields_strict'       => true,
-    'db_attr_case'           => \PDO::CASE_LOWER,
     'database'               => [
         // 数据库类型
         'type'        => 'mysql',
diff --git a/library/think/Lang.php b/library/think/Lang.php
index ca0d944c..c71d36e4 100644
--- a/library/think/Lang.php
+++ b/library/think/Lang.php
@@ -11,6 +11,9 @@
 
 namespace think;
 
+use think\Config;
+use think\Cookie;
+
 class Lang
 {
     // 语言参数
@@ -136,17 +139,17 @@ class Lang
         if (isset($_GET[$langDetectVar])) {
             // url中设置了语言变量
             $langSet = strtolower($_GET[$langDetectVar]);
-            \think\Cookie::set($langCookieVar, $langSet, 3600);
-        } elseif (\think\Cookie::get($langCookieVar)) {
+            Cookie::set($langCookieVar, $langSet, 3600);
+        } elseif (Cookie::get($langCookieVar)) {
             // 获取上次用户的选择
-            $langSet = strtolower(\think\Cookie::get($langCookieVar));
+            $langSet = strtolower(Cookie::get($langCookieVar));
         } elseif (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
             // 自动侦测浏览器语言
             preg_match('/^([a-z\d\-]+)/i', $_SERVER['HTTP_ACCEPT_LANGUAGE'], $matches);
             $langSet = strtolower($matches[1]);
-            \think\Cookie::set($langCookieVar, $langSet, 3600);
+            Cookie::set($langCookieVar, $langSet, 3600);
         }
-        if (in_array($langSet, \think\Config::get('lang_list'))) {
+        if (in_array($langSet, Config::get('lang_list'))) {
             // 合法的语言
             self::$range = $langSet;
         }