laravel加入三個表

Question

我有三個表是如下：

invent_accessory ID，密碼，細節，is_length

invent_price_accessory ID，invent_accessory_id_fk，價格，顏色

invent_price_accessory_length id，invent_accessory_id_fk，price，color

我如何結合這三個表，這樣我可以得到ID，密碼，DETAL，is_length，價格，顏色

我做以下，但它不不返回任何數據：

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; 

} 

我在猜測我必須做invent_price_accessory和invent_price_accessory_length然後加入invent_accessory？我該怎麼做呢？請幫助。

Answer 1

我的猜測是對的！我能解決這個：

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; 

}