不要使用原始sql查询代替你可以这样做

public function student()
    {
        $users=Details::all();
        return view('welcome',compact('users'));
    }

或者像这样

public function student()
    {
        $users = DB::table('details')
        ->select('*')
        ->get();
        return view('welcome', compact('users'));
    }

然后在你的刀刃上你可以像这样

@isset($users)
                    @foreach ($users as $user)
                        <tr>
                            <td>{{ $user->id }}</td>
                            <td>{{ $user->email }}</td>
                            <td>{{ $user->status }}</td>
                            <td>{{ $user->subject }}</td>
                        </tr>
                    @endforeach
                @endisset