OCTOBERCMS Form and Model - php

Question

I'm a newbie in OctoberCms and i don't have much knowledge in Laravel also. While self studying I face a request like this it's a Select if record exist query I need to read the database and look for the match and I'm really confuse.
This is my form in form.htm where I design my Form.
use Drufal\DynamicContentManager\Models\MembersVerification;
==
<form data-request="onSend" accept-charset="UTF8" enctype="multipart/form-data">
<div class="form-group">
<label>First Name:</label>
<input type="text" class="form-control" name="first_name" required>
</div>
<div class="form-group">
<label>Middle Name:</label>
<input type="text" class="form-control" name="middle_name">
</div>
<div class="form-group">
<label>Last Name:</label>
<input type="text" class="form-control" name="last_name" required>
</div>
<div class="form-group">
<button type="submit" class="btn btn-primary" >Submit</button>
</div>
</form>
and this my model
<?php namespace Drufal\DynamicContentManager\Models;
use Model;
use Input;
/**
* Model
*/
class MembersVerification extends Model
{
use \October\Rain\Database\Traits\Validation;
/*
* Disable timestamps by default.
* Remove this line if timestamps are defined in the database table.
*/
public $timestamps = false;
/**
* #var array Validation rules
*/
public $rules = [
];
/**
* #var string The database table used by the model.
*/
public $table = 'drufal_dynamiccontentmanager_members';
public function onSend(){
$fn = Input::get('first_name');
$mn = Input::get('middle_name');
$ln = Input::get('last_name');
$membertbl=$table::where('first_name', '=', $fn)->first();
if ($membertbl === null) {
echo"
<script>
alert('Successfully');
</script>
";
}else{
echo"NO RESULT";
}
}
}
Help the newbie please.

Answer 1

I think you missed the DB:: in your database request:
$users = Db::table('users')->where('votes', 100)->first();
Maybe this documentation will help you:
https://octobercms.com/docs/database/query#where-clauses