用户名禁止重复

Laravel/app/Services/Admin/UserService.php

@@ -14,6 +14,12 @@ class UserService
     }
     public function Save($arr){
         if($arr['info']['id']){
+            $c=DB::table('users')->where(['username'=>$arr['info']['uname']])->get();
+            if(count($c)){
+                $result['status']='no';
+                $result['msg']='用户名已存在';
+                return $result;
+            }
             $query=DB::table('users')->where(['id'=>$arr['info']['id']])->update([
                 'group' => $arr['info']['groupId'],
                 'cn_name' => $arr['info']['cname'],