使用 Count、filter 和 WhereIn 将查询转换为 Laravel Query Builder答案

【问题标题】：Converting query into Laravel Query Builder with Count, filter, and WhereIn使用 Count、filter 和 WhereIn 将查询转换为 Laravel Query Builder
【发布时间】：2018-09-13 05:50:00
【问题描述】：

我有一个查询，我尝试将其转换为 laravel 查询生成器样式。但是我没能成功。

这是我的查询

SELECT
  count(*)
    FILTER (WHERE order_status_id IN (5, 4, 15))        AS ready_for_delivery,
  count(*)
    FILTER (WHERE order_status_id IN (6))               AS out_for_delivery,
  count(*)
    FILTER (WHERE order_status_id IN (4, 10, 9, 12, 7)) AS completed_order,
  count(*)
    FILTER (WHERE order_status_id IN (11, 16, 17, 13))  AS waiting_for_cancellation_return_change
FROM order_item_histories;

这是我从http://www.midnightcowboycoder.com/ 得到的，这显然行不通。但这是一个起点

DB::table('order_item_histories')
        ->selectSub('count', 'ready_for_delivery')
        ->selectSub('FILTER', 'ready_for_delivery')
        ->selectSub('count', 'out_for_delivery')
        ->selectSub('FILTER', 'out_for_delivery')
        ->selectSub('count', 'completed_order')
        ->selectSub('FILTER', 'completed_order')
        ->selectSub('count', 'waiting_for_cancellation_return_change')
        ->selectSub('FILTER', 'waiting_for_cancellation_return_change')
        ->get();

这个查询有效，但它只是原始的。我知道没有伤害，但是..

        $aa = DB::table('order_item_histories')
            ->select(DB::raw('count(*)
    FILTER (WHERE order_status_id IN (5, 4, 15))        AS ready_for_delivery,
  count(*)
    FILTER (WHERE order_status_id IN (6))               AS out_for_delivery,
  count(*)
    FILTER (WHERE order_status_id IN (4, 10, 9, 12, 7)) AS completed_order,
  count(*)
    FILTER (WHERE order_status_id IN (11, 16, 17, 13))  AS waiting_for_cancellation_return_change'))
            ->get();

【问题讨论】：

如果没坏，就不要修了
@Ohgodwhy 这是一种方法:)
我认为像这样的多个调用会起作用->selectSub('count(*) FILTER (WHERE order_status_id IN (5, 4, 15))', 'ready_for_delivery')，但在这种情况下编写原始查询完全没问题，只是要小心 SQL 注入

标签： mysql laravel postgresql laravel-query-builder

【解决方案1】：

DB::table('order_item_histories')
    ->selectRaw('count(*) FILTER (WHERE order_status_id IN (?, ?, ?)) AS ready_for_delivery', [5, 4, 15])
    ->selectRaw('count(*) FILTER (WHERE order_status_id IN (?)) AS out_for_delivery', [6])
    ->selectRaw('count(*) FILTER (WHERE order_status_id IN (?, ?, ?, ?, ?)) AS completed_order', [4, 10, 9, 12, 7])
    ->selectRaw('count(*) FILTER (WHERE order_status_id IN (?, ?, ?, ?))  AS waiting_for_cancellation_return_change', [11, 16, 17, 13])
    ->get();

【讨论】：

【解决方案2】：

尝试使用case 而不是filter

$users = DB::table('order_item_histories')
                 ->select(DB::raw('SUM(CASE WHEN order_status_id IN (5, 4, 15) THEN 1 ELSE 0 END) AS ready_for_delivery'))
                 ->select(DB::raw('SUM(CASE WHEN order_status_id IN (6) THEN 1 ELSE 0 END) AS out_for_delivery'))
                 ->select(DB::raw('SUM(CASE WHEN order_status_id IN (4, 10, 9, 12, 7) THEN 1 ELSE 0 END) AS completed_order'))
                 ->select(DB::raw('SUM(CASE WHEN order_status_id IN (11, 16, 17, 13) THEN 1 ELSE 0 END) AS waiting_for_cancellation_return_change'))
                 ->get();

【讨论】：

没有给我预期的输出。
你得到了什么结果