查询和子查询加入laravel

Question

我想首先加入子类和subling，它应该是连接mastercategory的子查询

$users = DB::table('mastercategory')
->join('subcategory', 'mastercategory.idcategory', '=', 'subcategory.idcategory_mastercategory')
->join('subling', 'subcategory.idsubcategory', '=', 'subling.idsubcategory_subcategory')
->select('mastercategory.*', 'subcategory.*','subling.*')
->get();

我想要这样的观点

Mobile and Access.
    1. Mobile
      a. IPhone
      b. Nokia
    2. Mobile Cover

我尝试了上面的查询和模型，但我得到这样的视图

Mobile and Access.
    1. Mobile
      a. IPhone
      b. Nokia
Mobile and Access.              
    2. Mobile Cover

Answer 1

试试这个，我使用了joinSub函数而不是join它可能会根据你的需要工作。

$subcategoryWithSubling = DB::table('subcategory')
->join('subling', 'subcategory.idsubcategory', '=', 
'subling.idsubcategory_subcategory')
->select('subcategory.*','subling.*');

$users = DB::table('mastercategory')
->joinSub($subcategoryWithSubling, 'subcategory', function($join) {
    $join->on('mastercategory.idcategory', '=', 
    'subcategory.idcategory_mastercategory')
})->get()