Question

在我的Laravel 5.3应用程序中，投票表有一个净投票栏。我希望根据净票数找到视频的排名。我想显示如下列表中的排名。我知道sql @raw方法。但是，我想使用Laravel方法。因为，还有一些其他表与此用户表连接，还需要进行其他一些缩短。

视频表：

id     | net_votes| video_id | 
------ | -------: |:-------: |
1      |    5     |   1      |   
2      |    11    |   2      |   
3      |    3     |   1      |    
4      |    6     |   3      |    
5      |    5     |   2      |

我想得到像这样的结果

id     | net_votes| rank
------ | -------: |:----:
2      |    11    |   1
4      |    6     |   2
1      |    5     |   3
5      |    5     |   4
3      |    3     |   5

我现在正在使用此代码。它的工作。但我想使用Laravel Eloquent Method。

$score_board_list = DB::select("SELECT *, total, @r:=@r+1 as rank,
           @l:=total FROM ( select username, first_name, video_title, 
           net_votes, sum(net_votes) as total from videos
           LEFT JOIN users ON videos.user_id = users.id
           LEFT JOIN profile ON users.id = profile.user_id
           group by videos.id order by total desc, videos.created_at desc ) totals, (SELECT @r:=0, @l:=NULL) rank");

Answer 1

要做到这一点

将子查询存储到变量

中

$subquery = "( 
     SELECT    username, 
               first_name, 
               video_title, 
               net_votes, 
               Sum(net_votes) AS total 
     FROM      videos 
     LEFT JOIN users 
     ON        videos.user_id = users.id 
     LEFT JOIN profile 
     ON        users.id = profile.user_id 
     GROUP BY  videos.id 
     ORDER BY  total DESC, 
               videos.created_at DESC ) totals";

然后相当于

Select * from (subquery)

进入Eloquent是

DB::table(DB::raw('subquery'))

然后选择自定义列

// for example  
->select(DB::raw('@r:=@r+1 as rank'))

所以你的查询构建器就像这样

$subquery = "( 
     SELECT    username, 
               first_name, 
               video_title, 
               net_votes, 
               Sum(net_votes) AS total 
     FROM      videos 
     LEFT JOIN users 
     ON        videos.user_id = users.id 
     LEFT JOIN profile 
     ON        users.id = profile.user_id 
     GROUP BY  videos.id 
     ORDER BY  total DESC, 
               videos.created_at DESC ) totals";


$score_board_list = DB::table(DB::raw($subquery))
->select(
    '*', 
    'total', 
    DB::raw('@r:=@r+1 as rank'), 
    DB::raw('@l:=total'))
->get();

如何在laravel中获得排名

1 个答案: