laravel 查询生成器中聚合函数的动态别名

Question

我想要一个 count() 函数的动态别名。

我使用 mysql 5.7 作为数据库。

这是代码。

$date = Carbon::parse('2021-03-11')
DB::table('payments')
        ->select(DB::raw('IFNULL(sum(amount),0) as :date'), $date)
        ->get();

而且我有这个错误

SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?, `2021-03-11` from `payments`' at line 1 (SQL: select IFNULL(sum(amount),0) as :date, `2021-03-11` from `payments`)

我期待这个结果

|2021-03-11|
|<amount_here>|

Answer 1

试试这样的：

$date = Carbon::parse('2021-03-11')
DB::table('payments')
        ->select(DB::raw('IFNULL(sum(amount),0) as "?"', [$date])
        ->get();