diff --git a/library/think/db/driver/Mysql.php b/library/think/db/driver/Mysql.php
index 0b641d00..a5720a7d 100644
--- a/library/think/db/driver/Mysql.php
+++ b/library/think/db/driver/Mysql.php
@@ -54,8 +54,8 @@ class Mysql extends Driver
         $result          = $this->query($sql);
         $info            = [];
         if ($result) {
-            $result = array_change_key_case($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/Sqlite.php b/library/think/db/driver/Sqlite.php
index ccec4874..62c5c3ff 100644
--- a/library/think/db/driver/Sqlite.php
+++ b/library/think/db/driver/Sqlite.php
@@ -42,8 +42,8 @@ class Sqlite extends Driver
         $result          = $this->query('PRAGMA table_info( ' . $tableName . ' )');
         $info            = [];
         if ($result) {
-            $result = array_change_key_case($result);
             foreach ($result as $key => $val) {
+                $val                = array_change_key_case($val);
                 $info[$val['name']] = [
                     'name'    => $val['name'],
                     'type'    => $val['type'],