我有一个来自html页面的数据。我想检查日期和地点值是否已经存在。如果它们存在，它应该抛出一个错误，说数据已经存在，如果那些日期和地点数据不在那里，它应该允许用户保存它。
这是我用来保存它的代码，

public function StoreSampling(Request $request)
{
  $date = Carbon::createFromFormat('d-m-Y', $request->input('date'))->format('Y-m-d');

  $doctorname = Input::get('doctorselected');
  $product = Input::get('product');
  $product= implode(',', $product);
  $quantity = Input::get('qty');
  $quantity =implode(',',$quantity);
  $representativeid = Input::get('representativeid');
  //Store all the parameters.
  $samplingOrder = new   SamplingOrder();
  $samplingOrder->date = $date;
  $samplingOrder->doctorselected = $doctorname;
  $samplingOrder->products = $product;
  $samplingOrder->quantity = $quantity;
  $samplingOrder->representativeid = $representativeid;
  $samplingOrder->save();
  return redirect()->back()->with('success',true);
}

我搜索了一些堆栈溢出页面。通过身份证找到了存在，这是样本，

$count = DB::table('teammembersall')
    ->where('TeamId', $teamNameSelectBoxInTeamMembers)
    ->where('UserId', $userNameSelectBoxInTeamMembers)
    ->count();

if ($count > 0){
    // This user already in a team
    //send error message
} else {
    DB::table('teammembersall')->insert($data);
}

但我想比较一下日期和地点。如果它们不存在，我想让用户保存它。基本上是试图阻止重复条目。
请帮帮我。