laravel 在条件下加入子查询

Question

i have two kind of product. game and game-time .

in my code. item_id column of order_items table, represents the id of target product (may be id of game_codes or game_time_codes )

and product_type_id represents the id of product kind (number 1 for gameCode and 2 for gametime )

in my code im trying to show specific user orders with purchased items info.

i should join game_codes when if product_type_id is 1

and join game_time_codes when if product_type_id is 2

i wrote this query but it return null. how can i fix this?

$joinGCSub = DB::table("game_codes")->where("user_id", 1)->where("sold", 1);
$joinGTSub = DB::table("game_time_codes")->where("user_id", 1)->where("sold", 1);

   $orders = DB::table('orders')
      ->leftJoin("order_items", "orders.id", "=", "order_items.order_id")
      ->leftJoin("product_types", "order_items.product_type_id", "=", "product_types.id")
      ->joinSub($joinGCSub, "gc" , function ($join){
         $join->on('order_items.item_id', "=", "gc.id")->where("product_types.id", 1);
      })->joinSub($joinGTSub, "gt", function($join) {
         $join->on('order_items.item_id', "=", "gt.id")->where("product_types.id", 2);
      })
      ->where("orders.user_id", 1)
      ->get();


   dd($orders);

you can see tables structure below

order TABLE

id | user_id | .... etc

order_items table TABLE

id | order_id | product_type_id | item_id ...etc

game_codes TABLE

id | code | user_id | sold ... etc

game_time_codes TABLE

id | code | user_id | sold ...etc

Answer 1

Can write like below:

$joinGCSub = DB::table("game_codes")->where("user_id", 1)->where("sold", 1);
    $joinGTSub = DB::table("game_time_codes")->where("user_id", 1)->where("sold", 1);

    $query = DB::table('orders')
        ->leftJoin("order_items", "orders.id", "=", "order_items.order_id")
        ->leftJoin("product_types", "order_items.product_type_id", "=", "product_types.id");
    if ($product_type_id == 1)
        $query->joinSub($joinGCSub, "gc", function ($join) {
            $join->on('order_items.item_id', "=", "gc.id")->where("product_types.id", 1);
        });
    if ($product_type_id == 2)
        $query->joinSub($joinGTSub, "gt", function ($join) {
            $join->on('order_items.item_id', "=", "gt.id")->where("product_types.id", 2);
        });

    $orders = $query->where("orders.user_id", 1)
        ->get();


    dd($orders);

But it's better to use whereExist