diff --git a/library/think/config/driver/ConfigInterface.php b/library/think/config/driver/ConfigInterface.php
deleted file mode 100644
index c38727c9..00000000
--- a/library/think/config/driver/ConfigInterface.php
+++ /dev/null
@@ -1,25 +0,0 @@
-<?php
-// +----------------------------------------------------------------------
-// | ThinkPHP [ WE CAN DO IT JUST THINK ]
-// +----------------------------------------------------------------------
-// | Copyright (c) 2006~2016 http://thinkphp.cn All rights reserved.
-// +----------------------------------------------------------------------
-// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
-// +----------------------------------------------------------------------
-// | Author: liu21st <liu21st@gmail.com>
-// +----------------------------------------------------------------------
-
-namespace think\config\driver;
-
-interface ConfigInterface
-{
-
-    /**
-     * 解析配置
-     * @access public
-     * @param mixed $config 配置
-     * @return mixed
-     */
-    public function parse($config);
-
-}
diff --git a/library/think/config/driver/Ini.php b/library/think/config/driver/Ini.php
index 61a49df6..d8dc558d 100644
--- a/library/think/config/driver/Ini.php
+++ b/library/think/config/driver/Ini.php
@@ -11,7 +11,7 @@
 
 namespace think\config\driver;
 
-class Ini implements ConfigInterface
+class Ini
 {
     public function parse($config)
     {
diff --git a/library/think/config/driver/Xml.php b/library/think/config/driver/Xml.php
index 6cbd82bc..5bc93015 100644
--- a/library/think/config/driver/Xml.php
+++ b/library/think/config/driver/Xml.php
@@ -11,7 +11,7 @@
 
 namespace think\config\driver;
 
-class Xml implements ConfigInterface
+class Xml
 {
     public function parse($config)
     {
diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index c7a5fc78..1483eb5e 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -139,17 +139,21 @@ class Query
                 $result = $pdo->fetchAll(PDO::FETCH_COLUMN);
             } else {
                 $resultSet = $pdo->fetchAll(PDO::FETCH_ASSOC);
-                $fields    = array_keys($resultSet[0]);
-                $count     = count($fields);
-                $key1      = array_shift($fields);
-                $key2      = $fields ? array_shift($fields) : '';
-                $key       = $key ?: $key1;
-                foreach ($resultSet as $val) {
-                    if ($count > 2) {
-                        $result[$val[$key]] = $val;
-                    } elseif (2 == $count) {
-                        $result[$val[$key]] = $val[$key2];
+                if ($resultSet) {
+                    $fields = array_keys($resultSet[0]);
+                    $count  = count($fields);
+                    $key1   = array_shift($fields);
+                    $key2   = $fields ? array_shift($fields) : '';
+                    $key    = $key ?: $key1;
+                    foreach ($resultSet as $val) {
+                        if ($count > 2) {
+                            $result[$val[$key]] = $val;
+                        } elseif (2 == $count) {
+                            $result[$val[$key]] = $val[$key2];
+                        }
                     }
+                } else {
+                    $result = [];
                 }
             }
             if (isset($cache)) {