使用mySQLi Prepared Statement更新

Question

I have written the code below and it is supposed to update a selected entry in the database when the user presses the update button. When I press the update button I just get a blank page. I cannot figure out what is wrong with my code. Any help would be appreciated.

        <?php
    //Open a new connection to the MySQL server
    $mysqli = new mysqli('localhost','some directory','some password','some user ');

    //Output any connection error
    if ($mysqli->connect_error) {
        die('Connection failed : ('. $mysqli->connect_errno .') '. $mysqli->connect_error);
    }

 // check if the 'id' variable is set in URL, and check that it is valid
     if (isset($_GET['cd']) && is_numeric($_GET['cd']))

     // get id value
     $id = $_GET['cd'];


$firstname  = $_POST['firstname']; 
$lastname   = $_POST['lastname'];
$phonenumber    = $_POST['phonenumber'];    
$city       = $_POST['city'];
$state      = $_POST['state'];
$zipcode    = $_POST['zipcode'];
$dob        = $_POST['dob'];
$doi        = $_POST['doi'];
$adjustername   = $_POST['adjustername'];
$claimrefnumber = $_POST['claimrefnumber'];
$providernature = $_POST['providernature'];
$created    = $_POST['created'];
$language   = $_POST['language'];
$client     = $_POST['client'];
$amountauthorized = $_POST['amountauthorized'];
$active     = $_POST['active'];
$invoiceformat  = $_POST['invoiceformat'];


$query = ("UPDATE tabele SET firstname, lastname, phonenumber, city, state, zipcode, dob, doi, adjustername, claimrefnumber, providernature, created,language, client, amountauthorized, active, invoiceformat, WHERE id)
VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)");

$statement = $mysqli->prepare($query);

$statement->bind_param('isssssssssssssssss', $id, $firstname, $lastname, $phonenumber, $city, $state, $zipcode, $dob, $doi, $adjustername, $claimrefnumber, $providernature, $created, $language, $client, $amountauthorized, $active, $invoiceformat);

if($statement->execute()){
 header("some location");
    }else{
        die('Error : ('. $mysqli->errno .') '. $mysqli->error);
    }
    $statement->close();
?>

Answer 1

I figured it out, I finally found an example that works although I had to tweak some parts. The code below will grab the id passed from the url, do a prepared statement to update the selected id, and then redirect to a url location. The only thing missing is a Limit statement which I haven't figured out how to make work.

The code will also work to delete will be nearly identical with a few minor tweaks.

<?php
     // check if the 'id' variable is set in URL, and check that it is valid
     if (isset($_GET['id']) && is_numeric($_GET['id']))

     // get id value
     $id = $_GET['id'];

    $results = $id;

    $firstname  = $_POST['firstname']; 
    $lastname   = $_POST['lastname'];
    $phonenumber    = $_POST['phonenumber'];    
    $city       = $_POST['city'];
    $state      = $_POST['state'];
    $zipcode    = $_POST['zipcode'];
    $dob        = $_POST['dob'];
    $doi        = $_POST['doi'];
    $adjustername   = $_POST['adjustername'];
    $claimrefnumber = $_POST['claimrefnumber'];
    $providernature = $_POST['providernature'];
    $created    = $_POST['created'];
    $language   = $_POST['language'];
    $client     = $_POST['client'];
    $amountauthorized = $_POST['amountauthorized'];
    $active     = $_POST['active'];
    $invoiceformat  = $_POST['invoiceformat'];

   $connection = new mysqli("localhost", "some directory", "some password", "some user");
   $statement = $connection->prepare("update table set firstname = ?, lastname = ?, phonenumber = ?, city = ?, state = ?, zipcode = ?, dob = ?, doi = ?, adjustername = ?, claimrefnumber = ?, providernature = ?, created = ?,language = ?, client = ?, amountauthorized = ?, active = ?, invoiceformat = ? where id = ?");
   $statement->bind_param("sssssssssssssssssi", $firstname, $lastname, $phonenumber, $city, $state, $zipcode, $dob, $doi, $adjustername, $claimrefnumber, $providernature, $created, $language, $client, $amountauthorized, $active, $invoiceformat, $id);

   $statement->execute();
    if($statement->execute()){
       header("some location");
    }else{
        die('Error : ('. $mysqli->errno .') '. $mysqli->error);
    }
    $statement->close();
?>