Mysql数据库没有更新

Question

Okay so users on my game have a page. Other users can comment on the page. I made a script to where the user can set it to where people can comment on their wall or if it's disabled. If I manually change the database it works, but I have it setup with radio buttons and it's not updating. Here's the form.

<form action="settings" method="post">
Comments: <br />
Enabled:  
<input type="radio" name="change_wall" id="change_wall" value="no" checked="checked" />
<br />
Disabled: 
<input type="radio" name="change_wall" id="change_wall" value="yes" />
<br />
<input type="submit" value="Change" />
</form>

Below this is the SQL of the database updating.

    <?php
    if ( isset ( $_POST['change_wall'] ) )
        {
        $change_wall = mysql_real_escape_string($_POST['change_wall']); 
        if ($cash >= 5000) {
        $sql = "UPDATE users SET disable_wall='".$change_wall."' , cash=(cash - 5000) WHERE id='".$id."'";
        $res = mysql_query($sql);
            echo  
            '<table width="800" align="center" class="SettingsTable">
              <tr>
                <td>You sucessfully changed your comment settings!</td>
              </tr>
            </table>
            <br />';
        }
        else  {
            echo 
            '<table width="800" align="center" class="SettingsTable">
              <tr>
                <td>You don\'t have enough cash to change your comment settings!</td>
              </tr>
            </table>
            <br />'; 
        }
        }
?> 

Here's the coding for the user's page to display their comments or if it's disabled.

  <?php 
      if ($disable_wall = 0) { 
        include 'users_wall.php';
      }
      elseif ($disable_wall = 1) {
          echo 
          '<table width="800" align="center" class="DisabledWall">
          <tr>
            <td>' . $userp['name'] . '\'s ' . 'Comments Disabled!</td>
          </tr>
        </table>';
      }
    ?>

Answer 1

first of all, be sure that the sql query is executed - $cash is really >= 5000 and $id variable consists proper value

then, what type does the table field 'disable_wall' have? varchar or enum? not int?

if instructions above didnt help, type this after last line of your script:

die("error: ".mysql_error());

submit the form and watch, what error happened while you are updating the table

Answer 2

Because you need a boolean (yes/no) response, you can simply set them to 0 or 1, to be safe.
To answer your question, do

  $sql = "UPDATE users SET disable_wall='1' , cash=(cash - 5000);
 

And to disable the wall

  $sql = "UPDATE users SET disable_wall='0' , cash=(cash - 5000);
 

Better yet, use a boolean column for it.

Also, ensure that $id is a valid value, and currently has at least a row in the table.

More importantly, use PDO or MySQLi; MySQL extensions are already deprecated.

Hope this helps.