จะเพิ่มโค้ดการ delete ไว้ตรงไหนดีครับ ต้องการมีแค่ปุ่มเดียวครับ ไม่ได้ต้องการที่จะมีหลายๆปุ่ม ปุ่มเดียวทำงาน 2 อย่าง ทำได้มั้ยคับ

<?php


require("config.php");


if (!empty($_POST)) {
   
    $query        = " SELECT 1 FROM controldevice1 WHERE device1 = :dev1";

    $query_params = array(
        ':dev1' => $_POST['device1']
    );

    try {

        $stmt   = $db->prepare($query);
        $result = $stmt->execute($query_params);
    }
    catch (PDOException $ex) {

        $response["success"] = 0;
        $response["message"] = "Database Error1. Please Try Again!";
        die(json_encode($response));
    }

    $query = "INSERT INTO controldevice1 ( device1 ) VALUES ( :dev1 ) ";
    

    $query_params = array(
        ':dev1' => $_POST['device1'],

    );
    

    try {
        $stmt   = $db->prepare($query);
        $result = $stmt->execute($query_params);
    }
    catch (PDOException $ex) {


        $response["success"] = 0;
        $response["message"] = "Database Error2. Please Try Again!";
        die(json_encode($response));
    }
    

    $response["success"] = 1;
    $response["message"] = "Successfully Added!";
    echo json_encode($response);

    
    
} 
else {
?>
	<h1>testbutton</h1> 
	<form action="textbutton.php" method="post"> 
	    device:<br /> 
	    <input type="text" name="device1" value="" /> 
	    <br /><br /> 
	    <input type="submit" value="test" /> 
	</form>
	<?php
}

?>

<?php 

    $username = "root"; 
    $password = "ammaew"; 
    $host = "localhost"; 
    $dbname = "project"; 

    $options = array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'); 

    try 
    { 

        $db = new PDO("mysql:host={$host};dbname={$dbname};charset=utf8", $username, $password, $options); 
    } 
    catch(PDOException $ex) 
    { 

        die("Failed to connect to the database: " . $ex->getMessage()); 
    } 
     

    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 
     

    $db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC); 
     

    if(function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc()) 
    { 
        function undo_magic_quotes_gpc(&$array) 
        { 
            foreach($array as &$value) 
            { 
                if(is_array($value)) 
                { 
                    undo_magic_quotes_gpc($value); 
                } 
                else 
                { 
                    $value = stripslashes($value); 
                } 
            } 
        } 
     
        undo_magic_quotes_gpc($_POST); 
        undo_magic_quotes_gpc($_GET); 
        undo_magic_quotes_gpc($_COOKIE); 
    } 
     

    header('Content-Type: text/html; charset=utf-8'); 
 
    session_start(); 


?>