如何在laravel中从数据库中选择最后一行

Question

  public function addNewPost(Request $request)/****ADD new POST****/
  {
    $this->validate($request,['post_title'=>'required|min:4|max:100',
                              'post_description'=>'required|min:20|max:500'
                            ]);    

    $user_name = Session::get('name');
    $post_title = $request->input('post_title');
    $post_description = $request->input('post_description');


    $addPost = new AddNewPost(['user_name'=> $user_name, 'post_title'=> $post_title, 'post_description'=> $post_description]);
    $addPost->save();
    $addPost->post_id;
    //$addPost = DB::table('userposts')->where(['user_name'=>$user_name ])->orderBy('post_id', 'desc')->get();

    print_r($addAdmin->post_id); //This is printing nothing, i.e. blank.     
  }

userposts表中的post_id列是自动递增的。我正在尝试通过user_name获取用户的最后一个帖子 ID 。我看过一些教程，也通过互联网检查了一些问题，但无法做我想要的。任何人都可以知道如何做到这一点。谢谢你。

Answer 1

在查询中尝试 first() 而不是 get() 它可能对你有帮助

 $lastdata = DB::table('userposts')->where(['user_name'=>$user_name ])->orderBy('post_id', 'desc')->first();

print_r($lastdata);