简单post数据保存代码

是获取表单的数据再用update更新到mysql教程数据库教程
if( $_POST )
{
 $cid = PostGet('cid',1);
 $address = PostGet('address',1);
 $sql = "Update cn_loupan_city set address='$address' where id='$cid'";
 $Db = new Db();
 if( $Db->query( $sql ))
 {
  MessAge('修改成功');
 }
 else
 {
  MessAge('操作失败，稍后再试!');
 }
 unset( $Db );
}

<table width="64%" border="0" cellpadding="0" cellspacing="0">
<form name="form1" method="post" action="s.php教程">
  <tr>
    <td><input type="hidden" name="cid" value="<?=$id?>">

  <textarea name="address" cols="60" rows="10" id="address"><?=iconv('GB2312', 'UTF-8', $row['address']); ?></textarea></td>
  </tr>
  <tr>
    <td height="31"><input type="submit" name="Submit" value="保存修改"></td>
  </tr>
  </form>
</table>