在 Laravel 5.7 (Eloquent) 中从多个表中获取数据

伊斯兰教徒

我正在使用 Laravel 5.7。我有三个 MySQL 表，名称为：movies, movie_directors, movie_actors。我在从这些表中检索数据时遇到问题。看看我的表结构：

movies
|-----------------------------------------------------|
|   id  |   title       |   release |  img_url        |
|-----------------------------------------------------|
|  1    |  Avengers     |    2019   |    #            |
|-----------------------------------------------------|
|  2    |  Avatar       |    2009   |    #            |
|-----------------------------------------------------|
|  3    |  Titanic      |    1997   |    #            |
|-----------------------------------------------------|

directors
|-----------------------------------------------------|
|   id  |   movie_id  |   dir_name      |  add_date   |
|-----------------------------------------------------|
|  1    |    1        |  Anthony Russo  |  2019/02/18 |
|-----------------------------------------------------|
|  2    |    1        |    Joe Russo    |  2019/02/18 |
|-----------------------------------------------------|
|  3    |    2        |    Cameron      |  2019/02/18 |
|-----------------------------------------------------|

actors
|-----------------------------------------------------|
|   id  |   movie_id  |   act_name      |  add_date   |
|-----------------------------------------------------|
|  1    |    1        |  Robert Downey  |  2019/02/18 |
|-----------------------------------------------------|
|  2    |    1        |   Chris Evans   |  2019/02/18 |
|-----------------------------------------------------|
|  3    |    1        |  Mark Ruffalo   |  2019/02/18 |
|-----------------------------------------------------|
|  4    |    1        |   Chris Pratt   |  2019/02/18 |
|-----------------------------------------------------|
|  5    |    2        |   Worthington   |  2019/02/18 |
|-----------------------------------------------------|
|  6    |    2        |    Weaver       |  2019/02/18 |
|-----------------------------------------------------|
|  7    |    2        |    Saldana      |  2019/02/18 |
|-----------------------------------------------------|

I Want
|-------------------------------------------------------------------------------------------------------------------------------------------|
|   id  |   title       |   release |  img_url    |        directors           |                        actors                              |
|-------------------------------------------------------------------------------------------------------------------------------------------|
|  1    |  Avengers     |    2019   |    #        | Anthony Russo, Joe Russo   |  Robert Downey, Chris Evans, Mark Ruffalo, Chris Pratt     | 
|-------------------------------------------------------------------------------------------------------------------------------------------|
|  2    |  Avatar       |    2009   |    #        |     Cameron                |  Worthington, Weaver, Saldana                              |
|-------------------------------------------------------------------------------------------------------------------------------------------|
|  3    |  Titanic      |    1997   |    #        |                            |                                
|-------------------------------------------------------------------------------------------------------------------------------------------|

我正在使用的当前代码：

$movie_list = DB::table('movies')
            ->select('movies.*', 'movie_directors.*', 'movie_actors.*', 'movie_genres.*', 'movie_links.*', 'movie_types.*')
            ->join('movie_directors','movies.id', '=','movie_directors.movie_id')
            ->join('movie_actors', 'movies.id', '=', 'movie_actors.movie_id')
            ->where('movies.status',1)
            ->paginate(50)
            ;

查看代码底部的表格“我想要”。这就是我要的。请不要附上下面的链接作为已经回答的证据。如何在laravel eloquent中从多个表中检索数据与我的要求
不符

瓦迪姆·西布

为了实现这一点，您需要按movies.id 对结果进行分组，并使用group_concat逗号连接来提取结果。您的代码应如下所示：

$movie_list = DB::table('movies')
    ->select(
        'movies.*', 
        DB::raw('group_concat(movie_directors.dir_name) as directors'),
        DB::raw('group_concat(movie_actors.act_name) as actors')
    )
    ->join('movie_directors','movies.id', '=','movie_directors.movie_id')
    ->join('movie_actors', 'movies.id', '=', 'movie_actors.movie_id')
    ->where('movies.status',1)
    ->groupBy('movies.id')
    ->paginate(50)
    ;

您可以group_concat在此处阅读更多信息：https : //www.w3resource.com/mysql/aggregate-functions-and-grouping/aggregate-functions-and-grouping-group_concat.php

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