改进Query类的column对没有查询到数据的处理

library/think/config/driver/ConfigInterface.php

@@ -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);
-
-}

library/think/config/driver/Ini.php

@@ -11,7 +11,7 @@
 
 namespace think\config\driver;
 
-class Ini implements ConfigInterface
+class Ini
 {
     public function parse($config)
     {

library/think/config/driver/Xml.php

@@ -11,7 +11,7 @@
 
 namespace think\config\driver;
 
-class Xml implements ConfigInterface
+class Xml
 {
     public function parse($config)
     {

library/think/db/Query.php

@@ -139,6 +139,7 @@ class Query
                 $result = $pdo->fetchAll(PDO::FETCH_COLUMN);
             } else {
                 $resultSet = $pdo->fetchAll(PDO::FETCH_ASSOC);
+                if ($resultSet) {
                     $fields = array_keys($resultSet[0]);
                     $count  = count($fields);
                     $key1   = array_shift($fields);
@@ -151,6 +152,9 @@ class Query
                             $result[$val[$key]] = $val[$key2];
                         }
                     }
+                } else {
+                    $result = [];
+                }
             }
             if (isset($cache)) {
                 // 缓存数据