Question

您好我想在laravel 5.4中为以下SQL形成一个查询： select A.*, concat(B.firstname, ' ', B.lastname) as clientname, C.category as category from payments A, clients B, categories C where A.client_id = B.id and A.category_id = C.id

正确地给出了所有外键，并且还正确创建了模型。

我的目标是让所有主记录名称如category，client name等直接进入子表记录集。

Answer 1

将您的行查询粘贴到DB::row()并打印数据，如下所示

$data= DB::row("select A.*, concat(B.firstname, ' ', B.lastname) as clientname, C.category as category from payments A, clients B, categories C where A.client_id = B.id and A.category_id = C.id")->get();

dd($data);

如果您的查询是正确且妥善管理的关系而不是其检索数据

Answer 2

如果您已经提出Models而不是为什么不使用ORM？

使用模型，

payment::leftJoin('clients ','payments.client_id','=','clients.id')
->leftJoin('categories ','payments.category_id ','=','categories .id')->select(['payment.*','categories.category',DB::raw("CONCAT(clients.firstname,' ',clients.lastname) as clientname")])->get();

Answer 3

你可以试试这个：

DB::table('payments')
->select('payments.*',DB::raw('CONCAT(clients.firstname," ",clients.lastname) as clientname'),categories.category)
->join('clients','clients.id','=','payments.client_id')
->join('categories','categories.id','=','payments.category_id')
->get();

希望对你有所帮助!!!

Laravel 5.4 Eloquent多表查询

3 个答案: