如何在数据库PHP中UPDATE / SAVE值

Question

我是关于php和mysql的新手，我的脚本有问题。

我喜欢在数据库的特定行中保存/更新_GET值（其中facebook的ID是我数据库中的id）

php中的脚本：

<?php
header('Access-Control-Allow-Origin: *');

//////////////////////////////FACEBOOK LOAD

require 'client/facebook.php';
$app_id = "***";
$secret = "***";
$app_url = "***";
// Create our Application instance
$facebook = new Facebook(array(
'appId' => $app_id,
'secret' => $secret,
));
// Get User ID
$user = $facebook->getUser(); 
//Do we have a user?
if(!$user) {
    $loginUrl = $facebook->getLoginUrl(array('redirect_uri'=> $app_url));
    //redirect the url to prompt for login and permissions
    echo "<script type='text/javascript'>top.location.href = '$loginUrl';</script>";
    } else {
        try{
            //Proced knowing you have a logged in user who's autenticated
            $user_profile = $facebook->api('/me');
            $name = $user_profile['name'];
            $id = $user_profile['id'];
            $first_name = $user_profile['first_name'];
            $last_name = $user_profile['last_name'];
            $link = $user_profile['link'];
            $username = $user_profile['username'];
            $gender =  $user_profile['gender'];
            $locale = $user_profile['locale'];              
        } catch (FacebookApiException $e) {
            echo ($e);
            $user = null;
        }
}
// Get User ID
//////////////// CONNECT DATABASE
$sdb   = "MYHOST";
$db = "gioco";
$userdb = "root";
$passdb = "";

$dblink = mysql_connect($sdb,$userdb,$passdb);
$seldb = mysql_select_db($db);

//$user_type ="aa";  //USER DATA

$connection ="";  //variable for start function check UID
$checkUIDdb ="INATTESA";  //check if exist the UID facebook 
$insertnewuser ="";
$loadspecific ="inattesa";
$idC2= $_GET["idC2"];
$gold= $_GET["goldurl"];

///
///CHECK CONNECTION WITH DATABASE
///

$mysqlConnection = mysql_connect($sdb, $userdb, $passdb);
if (!$mysqlConnection)
{
  echo "NO DATABASE FOUND, CHECK USER, PASS, DB";
}
else
{
     $connection = "ok";
mysql_select_db($db, $mysqlConnection);
}

////////////////////PROBLEM******************************
  if ( $id == $idC2 ) {   ////IF ID FROM FACEBOOK API IS = ID FACEBOOK FROM GAME
     //$gold = strip_tags(mysql_real_escape_string($gold));                     
     //$sql = mysql_query("UPDATE gioco tabletest goldDB='$gold' WHERE UIDfacebook='$id'");
     $sql = "UPDATE goldDB = $gold FROM tabletest WHERE UIDfacebook = $id";

     if($sql){

          //The query returned true - now do whatever you like here.
          echo $connection = "SAVEDATA";

     }else{

          //The query returned false - you might want to put some sort of error reporting here. Even logging the error to a text file is fine.
          echo $connection = "ERROR, NO SAVEDATA";

     }

}else{
    //echo  "\\";

}
?>

但我不知道怎么写：

SAVE/UPDATE ON "namedatabase" "nametable" "name colunm,in this case goldDB" WHERE UIDFACEBOOK = $id"