Laravel:如何在laravel查询生成器中使用派生表/子查询

2022-08-31 00:52:20

编辑:

虽然这个问题最初是针对我在下面描述的查询的,但我得到的答案几乎适用于所有与在Laravel中使用派生表/子查询相关的问题。

原始问题:

最近我有点卡在laravel查询构建器上。它有一些非常好的功能,但我觉得它不是为更复杂的数据库操作而构建的。

这是我尝试构建的查询:

select 

'IFNULL(counted.product_count, 0) AS product_count', 
'uncounted.value', 
'uncounted.attribute_id', 
'uncounted.attribute_option_id' 

    from ( 

        select
        'counted.id', 
        'counted.attribute_id', 
        'counted.value', 
        'count(counted.attribute_id) AS product_count'

        from `attribute_options` as `counted` 
        where `counted.product_id` in (?, ?, ?, ?, ?) 
        group by `counted.attribute_option_id` 

    ) as 'counted' 

right join 'attribute_options' as 'uncounted'
        on 'counted.id' = 'uncounted.id' 

  group by 'attribute_option_id'

查询说明:我正在 laravel 中为我的产品目录构建一个多面搜索。根据用户提供的筛选器/属性缩小产品范围。为了获得更好的用户体验,我想显示每个过滤器剩余的产品数量,这就是上面的查询所做的:计算某个属性的所有产品,其中product_id位于产品ID数组中。

我的尝试:

    $productIds = [ 1, 2, 3, 4, 5 ];

    $subQuery = \DB::table('attribute_options')->selectRaw('counted.id, counted.attribute_id, counted.value, count(counted.attribute_id) AS product_count')
                    ->from('attribute_options AS counted')
                    ->whereIn('counted.product_id', $productIds)
                    ->groupBy('counted.attribute_option_id')
                    ->mergeBindings($subQuery);

    $query = Model::selectRaw('IFNULL(counted.product_count, 0) AS product_count, uncounted.value, uncounted.attribute_id, uncounted.attribute_option_id')
                    ->from(\DB::raw(' ( ' . $subQuery->toSql() . ' ) AS counted '))
                    ->rightJoin('attribute_options AS uncounted', 'counted.id', '=', 'uncounted.id')
                    ->groupBy('attribute_option_id')
                    ->get();

请帮助我,因为我不喜欢使用 DB::raw() 或 DB::select() 语句。那不会让人觉得“Laravelish”或“Eloquent”。


答案 1

您的第一次尝试看起来很接近。试试这个:

我删除了长命名空间引用,并建议您添加一个use语句,以使代码更具可读性

$productIds = [ 1, 2, 3, 4, 5 ];

$subQuery = DB::table('attribute_options AS counted')->selectRaw('counted.id, counted.attribute_id, counted.value, count(counted.attribute_id) AS product_count')
                ->whereIn('counted.product_id', $productIds)
                ->groupBy('counted.attribute_option_id')

$query = AttributeOption::selectRaw('IFNULL(counted.product_count, 0) AS product_count, uncounted.value, uncounted.attribute_id, uncounted.attribute_option_id')
                ->from(\DB::raw(' ( ' . $subQuery->toSql() . ' ) AS counted '))
                ->mergeBindings($subQuery->getQuery())
                ->rightJoin('attribute_options AS uncounted', 'counted.id', '=', 'uncounted.id')
                ->groupBy('attribute_option_id')
                ->get();

答案 2

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