laravel连接三个表

Question

我有如下三个表：

invent_accessory 编号、代码、详细信息，is_length

invent_price_accessory id,invent_accessory_id_fk,价格,颜色

invent_price_accessory_length id,invent_accessory_id_fk,价格,颜色

我如何组合这三个表以便我可以获得 id,code,detal,is_length,price,color

我已完成以下操作，但没有 return 任何数据：

 public function getAccessoryInventPrice(){

  $accessory=DB::table('invent_accessory')
        ->select('invent_accessory.id as accessory_id')
        ->join('invent_price_accessory','invent_price_accessory.invent_accessory_id_fk','=','invent_accessory.id')
        ->join('invent_price_accessory_length','invent_price_accessory_length.invent_accessory_id_fk','=','invent_accessory.id')
      ->get();

  return $accessory;

 }

我猜我必须先在 invent_price_accessory 和 invent_price_accessory_length 之间做 Union 然后加入invent_accessory？我该怎么做呢？请帮助。

Answer 1

我猜对了！！我能够通过以下方式解决这个问题：

  public function getAccessoryInventPrice(){


    $data1=\DB::table('invent_price_accessory')->select('accessory_code_id','color_id','rate');
    $data2=\DB::table('invent_price_acc_length')->select('accessory_code_id','color_id','rate')
              ->union($data1);

    $query= \DB::table(\DB::raw("({$data2->toSql()}) as invent_price"))

            ->join('invent_accessory','invent_price.accessory_code_id','=','invent_accessory.id')
            ->join('invent_color','invent_price.color_id','=','invent_color.id')
            ->select('invent_accessory.id','code','sl_detail','is_length','rate','invent_color.name')
            ->orderBy('invent_accessory.id','asc')
            ->get();
              return $query;

 }

laravel连接三个表

laravel join three tables

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