diff --git a/library/think/Model.php b/library/think/Model.php
index e689b3f1..51dcede1 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -32,6 +32,8 @@ class Model
     protected $name = '';
     // 数据库名称
     protected $dbName = '';
+    // 数据表字段大小写
+    protected $attrCase = \PDO::CASE_LOWER;
     //数据库配置
     protected $connection = [];
     // 数据表名（不包含表前缀）
@@ -96,6 +98,10 @@ class Model
             $this->dbName = $config['db_name'];
         }
 
+        if (isset($config['attr_case'])) {
+            $this->attrCase = $config['attr_case'];
+        }
+
         // 数据库初始化操作
         // 获取数据库操作对象
         // 当前模型有独立的数据库连接信息
@@ -1242,7 +1248,7 @@ class Model
                     // 行为验证
                     $result = Hook::exec($rule, '', $data);
                     break;
-                case 'filter': // 使用filter_var验证
+                case 'filter':    // 使用filter_var验证
                     $result = filter_var($value, is_int($rule) ? $rule : filter_id($rule), $options);
                     break;
                 case 'confirm':
@@ -1253,8 +1259,8 @@ class Model
                     $range  = is_array($rule) ? $rule : explode(',', $rule);
                     $result = 'in' == $type ? in_array($value, $range) : !in_array($value, $range);
                     break;
-                case 'between': // 验证是否在某个范围
-                case 'notbetween': // 验证是否不在某个范围
+                case 'between':// 验证是否在某个范围
+                case 'notbetween':    // 验证是否不在某个范围
                     if (is_string($rule)) {
                         $rule = explode(',', $rule);
                     }
@@ -1428,7 +1434,20 @@ class Model
         $guid   = md5($tableName);
         $result = Cache::get($guid);
         if (!$result) {
-            $info   = array_change_key_case($this->db->getFields($tableName));
+            $info = $this->db->getFields($tableName);
+            // 字段大小写转换
+            switch ($this->attrCase) {
+                case \PDO::CASE_LOWER:
+                    $info = array_change_key_case($info);
+                    break;
+                case \PDO::CASE_UPPER:
+                    $info = array_change_key_case($info, CASE_UPPER);
+                    break;
+                case \PDO::CASE_NATURAL:
+                default:
+                    // 不做转换
+            }
+
             $fields = array_keys($info);
             foreach ($info as $key => $val) {
                 // 记录字段类型
diff --git a/library/think/db/driver/Mysql.php b/library/think/db/driver/Mysql.php
index c08c6f59..471e44f2 100644
--- a/library/think/db/driver/Mysql.php
+++ b/library/think/db/driver/Mysql.php
@@ -58,7 +58,6 @@ class Mysql extends Driver
         $info   = [];
         if ($result) {
             foreach ($result as $key => $val) {
-                $val                 = array_change_key_case($val);
                 $info[$val['field']] = [
                     'name'    => $val['field'],
                     'type'    => $val['type'],
diff --git a/library/think/db/driver/Oracle.php b/library/think/db/driver/Oracle.php
index 015f23f2..932803c0 100644
--- a/library/think/db/driver/Oracle.php
+++ b/library/think/db/driver/Oracle.php
@@ -111,7 +111,6 @@ class Oracle extends Driver
         $info            = [];
         if ($result) {
             foreach ($result as $key => $val) {
-                $val                       = array_change_key_case($val);
                 $info[$val['column_name']] = [
                     'name'    => $val['column_name'],
                     'type'    => $val['data_type'],
diff --git a/library/think/db/driver/Sqlite.php b/library/think/db/driver/Sqlite.php
index 62c5c3ff..89be71b1 100644
--- a/library/think/db/driver/Sqlite.php
+++ b/library/think/db/driver/Sqlite.php
@@ -43,7 +43,6 @@ class Sqlite extends Driver
         $info            = [];
         if ($result) {
             foreach ($result as $key => $val) {
-                $val                = array_change_key_case($val);
                 $info[$val['name']] = [
                     'name'    => $val['name'],
                     'type'    => $val['type'],
diff --git a/library/think/log/driver/Trace.php b/library/think/log/driver/Trace.php
index 27695d39..3b30b8e7 100644
--- a/library/think/log/driver/Trace.php
+++ b/library/think/log/driver/Trace.php
@@ -14,7 +14,7 @@ use think\Config;
 use think\Debug;
 
 /**
- * 页面Trace调试 需要设置 'response_exit' => false 才能生效
+ * 页面Trace调试
  */
 class Trace
 {
@@ -70,13 +70,13 @@ class Trace
         foreach ($this->tabs as $name => $title) {
             $name = strtolower($name);
             switch ($name) {
-                case 'base': // 基本信息
+                case 'base':    // 基本信息
                     $trace[$title] = $base;
                     break;
-                case 'file': // 文件信息
+                case 'file':    // 文件信息
                     $trace[$title] = $info;
                     break;
-                default: // 调试信息
+                default:    // 调试信息
                     if (strpos($name, '|')) {
                         // 多组信息
                         $names  = explode('|', $name);