Laravel 5.3 “group by count” 查询问题

Question

拜托，我正在尝试在原始 sql 中运行一个看起来像这样的查询

SELECT `qnty`, COUNT(*) FROM cartlist GROUP BY `pro_id`,`cart_id`,`price`

在 Laravel 中。

我试过了

$count = DB::table('cartlist')
                 ->select(DB::raw('count(*) as qnty'))
                 ->where('pro_id', '$tt->pro_id')
                 ->where('cart_id', '$cart_id')
                 ->groupBy('pro_id','price')
                 ->get();

但是报错如下

类 Illuminate\Support\Collection 的对象无法转换为 int

Answer 1

$count = DB::table('cartlist') ->select(DB::raw('count(*) as qnty')) 
                               ->where('pro_id', '$tt->pro_id') 
                               ->where('cart_id', '$cart_id') 
                               ->groupBy('pro_id','price','cart_id') ->get();