How to add delete button in PHP form to delete a row from MySQL table

Question

I have output the results of the MySQL table into an HTML table. In the last column I want to add a delete option that calls another form and deletes the user from the MySQL table. But I can't seem to get it to work.

This is the code for my results page:

<?php
                    
    $contacts = mysql_query("
        SELECT * FROM contacts ORDER BY ID ASC") or die( mysql_error() );
    
    // If there is a result
    if( mysql_num_rows( $contacts ) > 0 )
    ?>
    
    <table id="contact-list">
        <thead>
            <tr>
                <th>Name</th>
                <th>Email</th>
                <th>Telephone</th>
                <th>Address</th>
                <th>Delete</th>
            </tr>
        </thead>
        <tbody>
        
        <?php while( $contact = mysql_fetch_array( $contacts ) ) : ?>
        
        

            <tr>
                <td class="contact-name"><?php echo $contact['name']; ?></td>
                <td class="contact-email"><?php echo $contact['email']; ?></td>
                <td class="contact-telephone"><?php echo $contact['telephone']; ?></td>
                <td class="contact-address"><?php echo $contact['address']; ?></td>
                <td class="contact-delete"><form action='delete.php' method="post">
<input type="hidden" name="name" value="">
<input type="submit" name="submit" value="Delete">
</form></td>
            </tr>
            
        <?php endwhile; ?>
        
        </tbody>
    </table>

This is my delete.php script:

<?php

//define query
$query = "DELETE FROM contacts WHERE name={$_POST['name']} LIMIT 1";

//Send query to delete entry
mysql_query ($query);

if (mysql_affected_rows() == 1) {
//If deletion is successful
?>

            <strong>Contact deleted</strong><br /><br />
    
<?php
 } else {
//If deletion fails
?>
    
            <strong>Deletion failed</strong><br /><br />
    

<?php
}
?>

I can't figure out why this doesn't work.

Answer 1

Use javascript

<input name="Submit2" type="button" class="button" onclick="javascript:location.href='delete.php?id=<?php echo $your_id;?>';" value="&laquo; 返回" />

In delete.php

$id=$_GET['id'];

And put $id into your sql statement.

Answer 2

You must pass a variable in the delete link. You have to pass <?php echo $contact['name']; ?>(name value) in a hidden field or pass this value to URL：

Replace

with

<td class="contact-delete">
      <form action='delete.php' method="post">
      <input type="hidden" name="name" value="">
      <input type="submit" name="submit" value="Delete">
      </form>
</td>

use

<td class="contact-delete">
    <form action='delete.php?name="<?php echo $contact['name']; ?>"' method="post">
        <input type="hidden" name="name" value="<?php echo $contact['name']; ?>">
        <input type="submit" name="submit" value="Delete">
    </form>
</td>