Laravel join 和 left join 在一个查询中

debugcn 发表于 Dev

用户9452884

我有一个 sql 查询，我想将其转换为查询构建器或 Laravel ORM。它工作正常。但我希望它进入查询构建器表单或 ORM。是否可以在查询构建器或 ORM 中编写？。

我有四个表答案、问题、用户和 upvote_answers。查询具有三个“连接”和一个“左连接”，只是为了检查当前登录的用户是否赞成（布尔值）一个答案以及其他属性

   SELECT answers.answer_content as answer_content,
          answers.id as answer_id,
          answers.created_at as created_at,
          answers.created_at as answer_upvote,
          answers.created_at as answer_downvote,
          questions.id as question_id, 
          questions.question_title as question_title, 
          questions.question_slug as question_slug, 
          users.id as user_id, 
          users.name as user_name, 
          users.user_slug as user_slug,
          upvote_answers.upvote as upvote
                                        FROM 
                                            answers
                                            JOIN questions on questions.id = answers.question_id
                                            JOIN users on users.id = answers.user_id
                                            LEFT JOIN upvote_answers ON
                                                upvote_answers.answer_id = answers.id AND
                                                upvote_answers.user_id = '2'
                                        WHERE 
                                            questions.question_active = 1 and 
                                            answers.answer_active = 1

M哈立德朱奈德

使用查询构建器，您可以将查询编写为

DB::table('answers as a')
    ->join('questions as q', 'q.id', '=', 'a.question_id')
    ->join('users as u', 'u.id', '=', 'a.user_id')
    ->leftJoin('upvote_answers as ua', function ($join) {
        $join->on('ua.answer_id', '=', 'a.id')
             ->where('ua.user_id', '=', 2);
    })
    ->where('q.question_active', '=', 1)
    ->where('a.answer_active', '=', 1)
    ->select(DB::raw('a.answer_content as answer_content,a.id as answer_id,a.created_at as created_at,a.created_at as answer_upvote,a.created_at as answer_downvote,q.id as question_id, q.question_title as question_title, q.question_slug as question_slug, u.id as user_id, u.name as user_name, u.user_slug as user_slug,ua.upvote as upvote'))
    ->get();

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