Laravel Eloquent limit() 和 count() 返回完整计数

Question

我需要对最新的 1000 条记录使用count() 方法。

例如，我们有 3 个用户：

• 拥有 900 条记录的用户 A
• 拥有 20.000 条记录的用户 B
• 用户 C 有 10 条记录

现在我想只考虑最近的 1000 条记录进行计算，这意味着用户 A 和 C 将使用他们的所有记录，因为

// This should return for User A and C, 900 and 10, but for User C 1000
$recent_activities = Activity::select('id', 'user_id', 'activity')->where('user_id', $user->id)
->latest('id')->limit(1000)->count();



// The next 3 queries should analyse the recent 1000 records for occurences of certain %like% records and count them
$result_chat_refunds = Activity::where('activity', 'like', 'Credits erstattet%')->where('user_id', $user->id)
->latest('id')->limit(1000)->count();

$result_credit_membership = Activity::where('activity', 'like', '%Membership gutgeschrieben%')->where('user_id', $user->id)
->latest('id')->limit(1000)->count();

$result_credit_credits = Activity::where('activity', 'like', '%Credits gutgeschrieben%')->where('user_id', $user->id)
->latest('id')->limit(1000)->count();

我怎样才能做到这一点？

Answer 1

这是一个简单的解决方案，它并没有真正使用 eloquent 的任何其他工具。

似乎工作得很好，性能也很棒。

$combined_array = array();

$recent_activities = Activity::select('id', 'user_id', 'activity')->where('user_id', $user->id)
->latest('id')->limit(1000)->get();

$combined_array['number_total'] = count($recent_activities);
$count_chat_refunds = 0;
$count_credit_membership = 0;
$count_credit_credits = 0;
foreach($recent_activities as $cr) {
    if (str_starts_with($cr->activity, "Credits erstattet")) {
        $count_chat_refunds += 1;
    } else if (str_contains($cr->activity, "Membership gutgeschrieben")) {
        $count_credit_membership += 1;
    } else if (str_contains($cr->activity, "Credits gutgeschrieben")) {
        $count_credit_credits += 1;
    }
}

$combined_array['number_chat_refunds'] = $count_chat_refunds;
$combined_array['number_credit_membership'] = $count_credit_membership;
$combined_array['number_credit_credits'] = $count_credit_credits;

Answer 2

也许是这样的修改：

 SELECT TOP 1000 X, 
        COUNT(X) OVER() AS Y
 FROM TblZ
 WHERE Criteria ='Whatever'
 ORDER BY ID DESC

IDK 我没有测试这个所以不要开枪。

Answer 3

第一次没有正确理解问题：

$recentActivities = Activity::select('id')->where('user_id', $user->id)->latest('id')->limit(1000);

$resultChatRefunds = Activity::where('activity', 'like', 'Credits erstattet%')->whereIn('id', $recentActivities)->count();
$resultCreditMembership = Activity::where('activity', 'like', '%Membership gutgeschrieben%')->whereIn('id', $recentActivities)->count();
$resultCreditCredits = Activity::where('activity', 'like', '%Credits gutgeschrieben%')->whereIn('id', $recentActivities)->count();

请注意，限制与计数在数据库中的工作方式与您的结果一样：

https://www.db-fiddle.com/f/tWDPuHtJsxiFYRv3XEFwH5/0

因为SELECT语句在LIMIT之前运行，所以DB先统计记录，然后限制为1000，但是统计后你有一条记录，所以没有什么限制。