Laravel 多个计数，条件来自一张表

Question

我有一个orders 表，需要根据具体情况合并多个计数。

目前我有 3 个查询：

$orderCount = Order::count();
$newOrderCount = Order::where('status', '=', 'new')->count();
$completedOrderCount = Order::where('status', '=', 'completed')->count();

如何将其组合成 1 个查询？

Answer 1

不是用雄辩的，而是我想到的第一个解决方案

DB::table('orders')
    ->select(DB::raw('count(*) as order_count'))
    ->addSelect(DB::raw('sum(case when status = "new" then 1 else 0 end) as new_orders_count'))
    ->addSelect(DB::raw('sum(case when status = "completed" then 1 else 0 end) as completed_orders_count'))
    ->get();

---

或者用集合来做：

$orders = Order::all();
$orderCount = $orders->count();
$newOrderCount = $orders->where('status', '=', 'new')->count();
$completedOrderCount = $orders->where('status', '=', 'completed')->count();

Answer 2

一个冗长的解决方案，但也可以解决问题。

$orders = Order::all(['id'])->toArray();
$orderCount = 0;
$newOrderCount = 0;
$completedOrderCount = 0;

array_map(function ($o) use (&$orderCount, &$newOrderCount, &$completedOrderCount) {
    $orderCount++;

    if($o['status'] === 'new')
        $newOrderCount++;

    if($o['status'] === 'completed')
        $completedOrderCount++;

}, $orders);