MySql. After HTML button is clicked - TRUNCATE database table - php

Question

So I need simple thing, I need to create button in my website, after button is clicked, It should truncate database table, but I can't do It successfully by myself. So could you help me, please?
Here I'm trying to creeate button:
<input type="button" id='delete' class='delete' value='Truncate' onClick="$truncate">
</input>
I know this is wrong way to use PHP variable in HTML, but I don't know how to do It correctly.
Here is my PHP variable:
$truncate= "TRUNCATE TABLE myTable";
With connection to database is all right:
$mysqli = new mysqli("localhost","database","password","asd");
So maybe here is better method to create button for truncate database's table? Thank you.
UPDATED:
This won't work too, nothing happens after button is clicked.
if(isset($_POST['delete'])){
$delete= "TRUNCATE TABLE myTable";
}
?>
<input type="button" id='delete' class='delete' name="delete" value='Truncate' onClick="delete">
</input>

Answer 1

Here, give this a try.
PHP (delete_table.php)
<?php
// CONNECT TO THE DATABASE
$DB_HOST = "your_host";
$DB_NAME = "your_DB_name";
$DB_USER = "username";
$DB_PASS = "password";
$dbc = mysqli_connect($DB_HOST, $DB_USER, $DB_PASS, $DB_NAME)
or die('Error connecting to MySQL server');
if(isset($_POST['delete'])){
$query = "TRUNCATE TABLE `yourTable` "; // replace yourTable with one to delete
$result = mysqli_query($dbc,$query)
or die('Error deleting table.');
}
else {
echo "Sorry";
}
?>
HTML form
<form method="post" action="delete_table.php">
<input type="submit" id='delete' class='delete' name="delete" value='Truncate'></input>
</form>

Answer 2

I'm by far no jQuery expert but maybe something like this....untested of course
jQuery
$(document).ready(function() {
$('#delete').click(function() {
var table = $('#table').val(); //where #table could be an input with the name of the table you want to truncate
$.ajax({
type: "POST",
url: "truncate.php",
data: 'table='+ table,
cache: false,
success: function(response) {
alert('table dropped');
},
error: function(xhr, textStatus, errorThrown) {
alert('request failed');
}
});
});
});
PHP (truncate.php)
try {
// create a new instance of a PDO connection
$db = new PDO(DB_TYPE.':host='.DB_HOST.';dbname='.DB_NAME, DB_USER, DB_PASS);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(PDOException $e) {
// if the connection fails, display an error message
echo 'ERROR: ' . $e->getMessage();
}
$table = $_POST['table'];
$sql = 'TRUNCATE TABLE '.$mytable;
$stmt = $db->prepare($sql);
$stmt->execute();
?>