Question

在我的数据库中，我有instagram_actions_histories表，该表中有action_type列，在该列中，我有不同的数据，例如1或2或{{1 }}

例如，我正在尝试获取关系表中的表数据并求和存储在列中的值

顺便说一句，此代码是不正确的，因为我想获取其中所有多个$userAddedPagesList = auth()->user()->instagramPages()->with([ 'history' => function ($query) { $query->select(['action_type as count'])->whereActionType(1)->sum('action_type'); } ] )->get();的所有history

sum

例如（伪代码）：

whereActionType(1)->sum('action_type')
whereActionType(2)->sum('action_type')
whereActionType(3)->sum('action_type')

更新：

$userAddedPagesList = auth()->user()->instagramPages()->with([
        'history' => function ($query)  {
            $query->select(['action_type as like'])->whereActionType(1)->sum('action_type');
            $query->select(['action_type as follow'])->whereActionType(2)->sum('action_type');
            $query->select(['action_type as unfollow'])->whereActionType(3)->sum('action_type');
        }
    ]
)->get();

错误：

$userAddedPagesList = auth()->user()->instagramPages()->with([
        'history' => function ($query) {
            $query->select('*')
                ->selectSub(function ($query) {
                    return $query->selectRaw('SUM(action_type)')
                        ->where('action_type', '=', '1');
                }, 'like')
                ->selectSub(function ($query) {
                    return $query->selectRaw('SUM(action_type)')
                        ->where('action_type', '=', '2');
                }, 'follow')
                ->selectSub(function ($query) {
                    return $query->selectRaw('SUM(action_type)')
                        ->where('action_type', '=', '3');
                }, 'followBack');
        }
    ]
)->get();

我如何实现此解决方案？

更新：

InstagramAccount类：

Syntax error or access violation: 1140 Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause (SQL: select *, (select SUM(action_type) where `action_type` = 1) as `like`, (select SUM(action_type) where `action_type` = 2) as `follow`, (select SUM(action_type) where `action_type` = 3) as `followBack` from `instagram_actions_histories` where `instagram_actions_histories`.`account_id` in (1, 2, 3))

InstagramActionsHistory类：

class InstagramAccount extends Model
{
    ...

    public function schedule()
    {
        return $this->hasOne(ScheduleInstagramAccounts::class, 'account_id');
    }

    public function history()
    {
        return $this->hasMany(InstagramActionsHistory::class, 'account_id');
    }
}

用户类别：

class InstagramActionsHistory extends Model
{
    protected $guarded=['id'];

    public function page(){
        return $this->belongsTo(InstagramAccount::class);
    }
}

Answer 1

selectSub()创建您在其中使用聚合（SUM）的子查询，但是select()是一个缩放器，返回一个缩放器结果；除非使用分组，否则不允许在同一级别上将聚合与缩放器查询混合。如果要返回每个用户的结果，请尝试添加groupBy，在此我假设id是{{1 }}表

users

Answer 2

另一种获取不同类型操作的条件总和的方法是，您可以在hasOne()模型中定义一个InstagramAccount关系，如

public function history_sum()
{
    return $this->hasOne(InstagramActionsHistory::class, 'account_id')
        ->select('account_id',
            DB::raw('sum(case when action_type = 1 then 0 END) as `like`'),
            DB::raw('sum(case when action_type = 2 then 0 END) as `follow`'),
            DB::raw('sum(case when action_type = 3 then 0 END) as `followBack`')
        )->groupBy('account_id');
}

那么您可以急于将相关数据加载为

$userAddedPagesList = auth()->user()->instagramPages()->with('history_sum')->get();

采用这种方法将仅执行一个额外的查询，以根据您的条件获得3个不同的总和结果

select `account_id`,
sum(case when action_type = 1 then action_type else 0 END) as `like`, 
sum(case when action_type = 2 then action_type else 0 END) as `follow`, 
sum(case when action_type = 3 then action_type else 0 END) as `followBack` 
from `instagram_actions_histories` 
where `instagram_actions_histories`.`account_id` in (?, ?, ?) 
group by `account_id`

尽管与使用withCount的其他方法（同样是有效的答案）相比，将为每种操作类型添加3个相关的相关子查询，这可能会导致性能开销，但生成的查询如下所示< / p>

select `instagram_account`.*, 
(select sum(action_type) from `instagram_actions_histories` where `instagram_account`.`id` = `instagram_actions_histories`.`account_id` and `action_type` = ?) as `like`, 
(select sum(action_type) from `instagram_actions_histories` where `instagram_account`.`id` = `instagram_actions_histories`.`account_id` and `action_type` = ?) as `follow`,
(select sum(action_type) from `instagram_actions_histories` where `instagram_account`.`id` = `instagram_actions_histories`.`account_id` and `action_type` = ?) as `followBack`
from `instagram_account` 
where `instagram_account`.`user_id` = ? 
and `instagram_account`.`user_id` is not null

要检查生成的查询，请参考Laravel 5.3 - How to log all queries on a page?

Laravel在单个子句中使用多个where和sum

2 个答案: