How To Data Fetch From Database Using PHP OOPs CONCEPT

CREATE TABLE `student_details` (
  `id` int(11) NOT NULL,
  `name` varchar(100) DEFAULT NULL,
  `email` varchar(45) DEFAULT NULL,
  `contact_no` varchar(45) DEFAULT NULL,
  `gender` varchar(45) DEFAULT NULL,
  `qualification` varchar(45) DEFAULT NULL,
  `address` varchar(450) DEFAULT NULL,
  `create_date` timestamp NULL DEFAULT current_timestamp()
)

<?php
define("DEMO_PORT","3306");
define("DEMO_CharSet","utf8");
define("DEMO_USER",'root');
define("DEMO_HOST",'localhost');
define("DEMO_PASS",'');
define("DEMO_DB","student");
?>

fetch.php

<?php 
include 'DBConnect/MysqliDb.php';  
?>
  <link href="https://netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
  <div class="container">
    <div class="row centered-form">
      <div class="col-xs-10 ">
        <div class="panel panel-default">
          <div class="panel-heading">
            <h3 class="panel-title">Data Fetch From Database Using PHP PDO</h3> </div>
          <div class="panel-body">
           <table class="table table-bordered">
                <thead style="background-color: #677ba2; color: #fff;">
                <tr><th>Sr.No</th>
                  <th>Name</th>
                  <th>Email</th>
                  <th>Contact-No</th>
                  <th>Gender</th>
                  <th>Qualification</th>
                  <th>Address</th>

                </tr>
                </thead>
                <tbody>
                <?php 
        $fetch = "SELECT id,name,email,contact_no,gender,qualification,address from student_details";
        $myDB= new MysqliDb();
        $result=$myDB->Query($fetch);
        $count=1;
        if($result =="0")
       {
        echo "No Data Found";
       }
         else
        { 
             foreach($result as $key=>$value)
            {
              echo '<tr class="data">
                  <td class="data" width="25px">'.$count.'</td>
                  <td class="user_type">'.$value['name'].'</td>
                  <td class="name">'.$value['email'].'</td>
                  <td class="user_id">'.$value['contact_no'].'</td>
                  <td class="password">'.$value['gender'].'</td>
                  <td class="password">'.$value['qualification'].'</td>
                  <td class="password">'.$value['address'].'</td>
                 
              </tr>';
               $count++;
            }
        }
     ?>
                </tbody>
              </table>
          </div>
        </div>
      </div>
    </div>
  </div>
  <style type="text/css">
  body {
    background-color: #fff;
  }
  
  .centered-form {
    margin-top: 60px;
  }
  
  .centered-form .panel {
    background: rgba(255, 255, 255, 0.8);
    box-shadow: rgba(0, 0, 0, 0.3) 20px 20px 20px;
  }
  </style>