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目前，在我的 Laravel 项目控制器中，我正在使用一个查询

查询 1

public function cartreview(Request $request,$sp_id, $service_id,$cart_id)
    {
    $total = DB::table('pricings')
    ->join('carts', 'carts.sp_id', '=', 'pricings.sp_id')
    ->select(DB::raw('sum(pricings.shirt*carts.quantity_shirt ) AS total'))                      
    ->where('pricings.sp_id', '=', $sp_id)
    ->where('carts.id', '=' , $cart_id)
    ->first();
    }

在上面的查询中，我使用两个数据库表作为定价和购物车 ，我通过从定价表中获取价格和从购物车表中获取数量来计算衬衫商品的总账单价格。

现在我还想添加另一件衬衫，比如裤子、领带等。如何将更多的乘法传递给总和？

请帮我语法。我可以做这样的事情吗

查询 2

    $total = DB::table('pricings')
        ->join('carts', 'carts.sp_id', '=', 'pricings.sp_id')
        ->select(DB::raw('sum(pricings.shirt*carts.quantity_shirt ,
                             pricings.pant*carts.quantity_pant , 
                             pricings.tie*carts.quantity_tie) AS total'))                      
        ->where('pricings.sp_id', '=', $sp_id)
        ->where('carts.id', '=' , $cart_id)
        ->first();

或者即使我为每个项目单独计算总计如何添加？

$total_shirt = DB::table('pricings')
    ->join('carts', 'carts.sp_id', '=', 'pricings.sp_id')
    ->select(DB::raw('sum(pricings.shirt*carts.quantity_shirt ) AS total_shirt'))                      
    ->where('pricings.sp_id', '=', $sp_id)
    ->where('carts.id', '=' , $cart_id)
    ->first();

   $total_pant = DB::table('pricings')
    ->join('carts', 'carts.sp_id', '=', 'pricings.sp_id')
    ->select(DB::raw('sum(pricings.pant*carts.quantity_pant ) AS total_pant'))                      
    ->where('pricings.sp_id', '=', $sp_id)
    ->where('carts.id', '=' , $cart_id)
    ->first();

   $total_tie = DB::table('pricings')
    ->join('carts', 'carts.sp_id', '=', 'pricings.sp_id')
    ->select(DB::raw('sum(pricings.tie*carts.quantity_tie ) AS total_tie'))                      
    ->where('pricings.sp_id', '=', $sp_id)
    ->where('carts.id', '=' , $cart_id)
    ->first();

$total = $total_shirt + $total_pant + $total_tie; ?

要在 view.blade.php 中显示值，我使用类似 {{$total->total}}

提前致谢。

试过：

$waftotal = DB::table('pricings')->join('carts', 'carts.sp_id', '=', 'pricings.sp_id')
                  ->select(DB::raw('sum(
                                        pricings.Regular_Laundry*carts.q_Regular_Laundry,
                                        pricings.Bedding_Mattress_Duvet_Cover*carts.q_Bedding_Mattress_Duvet_Cover,
                                        pricings.Bedding_Comforter_laundry*carts.q_Bedding_Comforter_laundry,
                                        pricings.Bedding_Blanket_Throw*carts.q_Bedding_Blanket_Throw,
                                        pricings.Bedding_Pillow_laundry*carts.q_Bedding_Pillow_laundry,
                                        pricings.Bath_Mat_laundry*carts.q_Bath_Mat_laundry,
                                        pricings.Every_Hang_Dry_Item*carts.q_Every_Hang_Dry_Item
                                        ) AS waftotal'))
                  ->where('pricings.sp_id', '=', $sp_id)->where('carts.id', '=' , $cart_id)->first();

但它给了我错误

SQLSTATE[42000]：语法错误或访问冲突：1064 您的 SQL 语法有错误；检查与您的 MariaDB 服务器版本相对应的手册，以在第 1 行的“pricings.Bedding_Mattress_Duvet_Cover c”附近使用正确的语法（SQL：select sum( pricings.Regular_Laundry carts.q_Regular_Laundry, pricings.Bedding_Mattress_Duvet_Cover carts.q_Bedding_Mattress_Duvet_Cover, pricings.Bedding_Comforter_laundry carts .q_Bedding_Comforter_laundry，pricings.Bedding_Blanket_Throw carts.q_Bedding_Blanket_Throw， pricings.Bedding_Pillow_laundry carts.q_Bedding_Pillow_laundry，pricings.Bath_Mat_laundry carts.q_Bath_Mat_laundry，pricings pricings.Every_Hang_Dry_Item carts.q_Every_Hang_Dcarts上carts。sp_id= pricings。sp_id哪里pricings。sp_id= 1 和carts. id= 23 限制 1)

即使我编写单独的查询

$waf1 = DB::table('pricings')->join('carts', 'carts.sp_id', '=', 'pricings.sp_id')
                  ->select(DB::raw('sum(pricings.Regular_Laundry*carts.q_Regular_Laundry) AS waf1'))
                  ->where('pricings.sp_id', '=', $sp_id)->where('carts.id', '=' , $cart_id)->first();



                    $waf2 = DB::table('pricings')->join('carts', 'carts.sp_id', '=', 'pricings.sp_id')
                  ->select(DB::raw('sum(pricings.Bedding_Mattress_Duvet_Cover*carts.q_Bedding_Mattress_Duvet_Cover) AS waf2'))
                  ->where('pricings.sp_id', '=', $sp_id)->where('carts.id', '=' , $cart_id)->first();



                    $waf3 = DB::table('pricings')->join('carts', 'carts.sp_id', '=', 'pricings.sp_id')
                  ->select(DB::raw('sum(pricings.Bedding_Comforter_laundry*carts.q_Bedding_Comforter_laundry) AS waf3'))
                  ->where('pricings.sp_id', '=', $sp_id)->where('carts.id', '=' , $cart_id)->first();


                    $waf4 = DB::table('pricings')->join('carts', 'carts.sp_id', '=', 'pricings.sp_id')
                  ->select(DB::raw('sum(pricings.Bedding_Blanket_Throw*carts.q_Bedding_Blanket_Throw) AS waf4'))
                  ->where('pricings.sp_id', '=', $sp_id)->where('carts.id', '=' , $cart_id)->first();

                    $waf5 = DB::table('pricings')->join('carts', 'carts.sp_id', '=', 'pricings.sp_id')
                  ->select(DB::raw('sum(pricings.Bedding_Pillow_laundry*carts.q_Bedding_Pillow_laundry) AS waf5'))
                  ->where('pricings.sp_id', '=', $sp_id)->where('carts.id', '=' , $cart_id)->first();

                    $waf6 = DB::table('pricings')->join('carts', 'carts.sp_id', '=', 'pricings.sp_id')
                  ->select(DB::raw('sum(pricings.Bath_Mat_laundry*carts.q_Bath_Mat_laundry) AS waf6'))
                  ->where('pricings.sp_id', '=', $sp_id)->where('carts.id', '=' , $cart_id)->first();

                    $waf7 = DB::table('pricings')->join('carts', 'carts.sp_id', '=', 'pricings.sp_id')
                  ->select(DB::raw('sum(pricings.Every_Hang_Dry_Item*carts.q_Every_Hang_Dry_Item) AS waf7'))
                  ->where('pricings.sp_id', '=', $sp_id)->where('carts.id', '=' , $cart_id)->first();

$waftotal = $waf1->waf1 + $waf2->waf2 + $waf3->waf3 + $waf4->waf4 + $waf5->waf5 + $waf6->waf6 + $waf7->waf7 ;

在 view.blade.php {{$waftotal}} 或 {{$waftotal->waftotal}} 给我 eerror 作为 Trying to get property of non-object 。

建议将不胜感激。

4

2 回答 2

0

first()将返回一个对象，因此您需要添加每个对象的属性： https ://laravel.com/docs/5.6/eloquent#retrieving-single-models

而不是$total = $total_shirt + $total_pant + $total_tie;

这是$total = $total_shirt->total_shirt + $total_pant->total_pant + $total_tie->total_tie;因为您已将每个对象的总和分配给以该对象命名的属性。

但是您的第一个组合查询应该可以正常工作。你得到什么错误？

于 2018-04-30T03:11:19.700 回答
0 
$maintotal = DB::table('carts')
           ->join('products', 'carts.productid', '=', 'products.id')
           ->select(DB::raw('sum(products.price*carts.quantity) AS maintotal3'))
           ->where('carts.userid', '=', $useri)->get();


  @foreach($maintotal as $t)
     {{$t->maintotal3}}
  @endforeach
于 2020-10-23T12:48:52.450 回答