Display Data on Web Page from Database when checkbox clicked

Question

I want to do that when my checkbox is checked, some values (data) from my database will be displayed on my web page, but when i execute my code there two message appears on my web page "Warning: mysql_query() expects parameter 1 to be string, resource given in C:\xampp\htdocs\php\checkboxes.php on line 5 " and "Warning: mysql_fetch_array() expects parameter 1 to be resource, null given in C:\xampp\htdocs\php\checkboxes.php on line 10". I almost try everything to fix this but i failed to, so i'm comming here to ask you for some help.

There is my code :

test.php :

<form action="checkboxes.php" method="post">
    <input type="checkbox" name="checkbox1" value="Yes" />
    <input type="submit" name="formSubmit" value="Submit" />
</form>

config.php :

<?php
/* Database connection */

$sDbHost = 'localhost';
$sDbName = 'testowanie';
$sDbUser = 'root';
$sDbPwd = '';
$dbcon = mysql_connect ($sDbHost, $sDbUser, $sDbPwd, $sDbName);
?>

checkboxes.php:

<?php
include('config.php');

$sqlget = "SELECT * FROM monitory";
$sqldata = mysql_query($dbcon, $sqlget);

if(isset($_POST['checkbox1']) && 
   $_POST['checkbox1'] == 'Yes') 
{
   while($row = mysql_fetch_array($sqldata, MYSQL_ASSOC)) {
    echo $row['cena'];
   }
}
 
?>