Search (verify) data from MySQL

Good Day all

I created Php file and imported it to my website. I need to do searching function for sertificates like this https://www.certmetrics.com/cisco/public/verification.aspx

All data (users with link to certificates) stored in MySQL in bank table
Please, help to do this

My current code:

<form action="" method="post">
<input type="text" name="search">
<input type="submit" name="submit" value="Search">
</form>

<?php
global $wpdb;
$search_value=$_POST["search"];
$con=$wpdb;
if($con->connect_error){
    echo 'Connection Failed: '.$con->connect_error;
    }else{
        $sql="select * from $wpdb->bank where ITACAD like '%$search_value%'";

        $res=$con->query($sql);

        while($row=$res->fetch_assoc()){
            echo 'Name:  '.$row["Name"];
			
            }       

        }
					
?>