How To Update row in custom wordpress table

Ive Tried And Tried Looking Up How To Approach Editing/Updating Rows In Custom Wordpress Tables I Have It Set To Grab Current logged in user's username which then compares to a custom wp_ table With UserNAme As The Primary Key Which Then I Would Like To Edit A Particular Column/Field On That Particular Row By Passing The Value Of A Variable Over After It Confirms Current Logged In User Matches The Primary Key UserName In My Custom Table"wp_customers" What Am I Doing Wrong With This Line Of Code Or Do You Have A Better Solution

$current_user = wp_get_current_user();

$johnny = $current_user->user_login;
$subs = 'illinois';
global $wpdb;
$wpdb->query(
"
UPDATE $wpdb->wp_Customers
SET BuyersAddress = $subs
WHERE UserName = $johnny

");

Try this code.

$current_user = wp_get_current_user();

$johnny = $current_user->user_login;
$subs = 'illinois';
global $wpdb;
$table_name = $wpdb->prefix."Customers";

$wpdb->query( $wpdb->prepare("UPDATE $table_name
SET BuyersAddress = %s
WHERE UserName = %s",$subs, $johnny)
);

Try this code

A simple WordPress Update query

[WP Update][1]

$current_user = wp_get_current_user();

$johnny = array('UserName' => $current_user->user_login);
$subs = array('BuyersAddress' => 'illinois');
global $wpdb;
$table_name = $wpdb->prefix."Customers";

$wpdb->update($table_name, $subs, $johnny);


Hope this will help you

[1]:

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$msg='';
if(isset($_POST['submit']) && $_POST['submit']=='Submit')

{
$assID =12; //pass your table id
$table_name = $wpdb->prefix."assigned_user"; //custom table name
$ds = $_POST['driverStatus'];
$wpdb->query( $wpdb->prepare("UPDATE $table_name SET driverStatus = '".$ds."' WHERE id ='".$assID."' ")
);

$msg = 'Successfully Delivered!';
}