Question

Laravel分页似乎与group by子句不能正常工作。例如：

            $users = Subject::select(DB::raw('subjects.*, count(user_subjects.id) as total_users'))
            ->join('user_subjects', 'user_subjects.subject_id', '=', 'subjects.id')
            ->whereNull('user_subjects.deleted_at')
            ->groupBy('subjects.id')
            ->orderBy('subjects.updated_at', 'desc')
            ->paginate(25);

生产

            select subjects.*, count(user_subjects.id) as total_users 
            from `subjects` inner join `user_subjects` on `user_subjects`.`subject_id` = `subjects`.`id` 
            where `subjects`.`deleted_at` is null and `user_subjects`.`deleted_at` is null 
            group by `subjects`.`id` 
            order by `subjects`.`updated_at` desc

请注意，查询中没有limit子句。

如果查询中没有group by子句，则工作正常：

$users = Subject::select(DB::raw('subjects.*, count(user_subjects.id) as total_users'))
            ->join('user_subjects', 'user_subjects.subject_id', '=', 'subjects.id')
            ->whereNull('user_subjects.deleted_at')
            ->orderBy('subjects.updated_at', 'desc')
            ->paginate(25);

产生了以下查询：

select subjects.*, count(user_subjects.id) as total_users from `subjects` 
            inner join `user_subjects` on `user_subjects`.`subject_id` = `subjects`.`id`
            where `subjects`.`deleted_at` is null and `user_subjects`.`deleted_at` is null 
            order by `subjects`.`updated_at` desc 
            limit 25 offset 0

有没有人知道如何解决这个问题？

Answer 1

查看文档 https://laravel.com/docs/5.2/pagination

目前，使用groupBy语句的分页操作不能由Laravel有效执行。如果您需要使用groupBy 在分页结果集中，建议您查询数据库并手动创建一个分页器。

Answer 2

这在laravel 5.2中适用于我

Select(\DB::RAW("assignment_descendant_child.assignment_descendant_child_id, assignment_descendant_child.assignment_descendant_child_name, COUNT(assignment_descendant.assignment_descendant_id) as xNum"))
            ->leftJoin(
                'assignment_descendant',
                'assignment_descendant.assignment_descendant_child_id',
                '=',
                'assignment_descendant_child.assignment_descendant_child_id'
            )
            ->orderBy('assignment_descendant_child_name')
            ->groupBy('assignment_descendant_child.assignment_descendant_child_id')
            ->paginate(\Config::get('constants.paginate_org_index'))

Answer 3

我认为如果你想分组和分页，这是有效的。

$code = DB::table('sources')
->select(DB::raw('sources.id_code,sources.title,avg(point) point'))
->join('rating','sources.id_code','rating.id_code')
->groupBy('sources.id_code')
->groupBy('sources.title')
->groupBy('sources.language')
->groupBy('sources.visited')
->groupBy('sources.')
->paginate(5);

Answer 4

创建名为view的数据库vw_anything。 MySql查询将类似于

create view vw_anything as select subjects.*, count(user_subjects.id) as total_users from subjects inner join user_subjects on user_subjects.subject_id = subjects.id where subjects。deleted_at is null and user_subjects。deleted_at is null group by subjects。id;
现在为此视图protected $table = 'vw_anything';

UserSubModel

现在您的分页查询将类似于UserSubModel::orderBy('subjects.updated_at', 'desc')->paginate(25);

。

要回答此问题Laravel Pagination group by year and month only

查看查询将是：

create view vw_anything as select gallery.*, DATE_FORMAT(created_at, "%Y-%m") as tanggal,count(created_at) as jumlah from gallery group by tanggal;

让您建模为VwModel，那么分页查询将为

VwModel::where('type','Foto')->orderBy('tanggal','desc')->paginate(2);

Answer 5

我知道这是一个古老的问题，我将分享我的解决方案以供将来参考。

我设法基于this link编写了一个函数，该函数完成了确定复杂查询的分页的繁重工作。只需传递“ QueryBuilder”，它将返回分页的对象/集合。

此外，此过程可以跟踪和维护page=以外的其他参数。

public function mergeQueryPaginate(\Illuminate\Database\Eloquent\Builder $query): \Illuminate\Pagination\LengthAwarePaginator
    {
        $raw_query = $query;
        $totalCount = $raw_query->get()->count();

        $page = request('page', 1);
        $skip = $perPage * ($page - 1);
        $raw_query = $raw_query->take($perPage)->skip($skip);

        $parameters = request()->getQueryString();
        $parameters = preg_replace('/&page(=[^&]*)?|^page(=[^&]*)?&?/', '', $parameters);
        $path = url(request()->getPathInfo() . '?' . $parameters);

        $rows = $raw_query->get();

        $paginator = new LengthAwarePaginator($rows, $totalCount, $perPage, $page);
        $paginator = $paginator->withPath($path);
        return $paginator;
    }

Laravel分页不适用于group by子句

5 个答案: