sql代码无法运行

Question

当我按提交时，它会返回成功消息，但不会扣除在线时间或增加信用额度。我做错了什么？ 我对PHP很陌生，所以如果你发现任何错误，请指出它。

谢谢！

    <?
    include ("config.php");
    $link = mssql_connect($server, $user, $pass);
    if(!$link) {
        die('Unavailable');
    } else {
    $rate1 = 20;
    $rate2 = 20;
    $rate3 = 20;
    $rate4 = 50;
        $onResult = mssql_query("SELECT MinutosOnline from MuOnline.dbo.MEMB_STAT where memb___id='test'");
        $online = mssql_fetch_row($onResult);
        if ($online[0] % 60 != 0) {
            $hour = number_format(($online[0] / 60), 0);
            $minutes = $online[0] % 60;
        } else {
            $hour = number_format(($online[0] / 60), 0);
            $minutes = 0;
        };
    if (isset($_GET['coinAdd'])) {
        $convertCoin = $_GET['convert'];
        $addType = 'WCoinP';
        $r = $online[0] - ($convertCoin * 60);
        if ($addType == 'WCoinC') {
            $addCoin = $convertCoin * $rate1;
        } elseif ($addType = 'WCoinP') {
            $addCoin = $convertCoin * $rate2;
        } elseif ($addType = 'goblin') {
            $addCoin = $convertCoin * $rate3;
        } else {
            $addCoin = $convertCoin * $rate4;
        }
        if ($convertCoin > $hour)
            {
            echo 'Amount to exchange cannot be greater than your available hour.';
            }
        else {
            $deduct = mssql_query("UPDATE MuOnline.dbo.MEMB_STAT SET MinutosOnline=(MinutosOnline - ".$r.") WHERE memb___id='test'");
            $add = mssql_query("UPDATE MuOnline.dbo.T_InGameShop_Point SET ".$addType."=(".$addType." + ".$addCoin.") WHERE accountid='test'");
            if ($deduct && $add) {
                echo 'Success';
                    } else {
                echo 'Error';
            }
        }
    }

        echo '
    <form id="sign_up_frm" method="GET">
        <fieldset><legend>Exchange</legend>
            <div class="required">
                <label>Online Time: </label> '.$hour.' hour '.$minutes.' minutes.
            </div>
            <div class="required">
                <label>Currency: </label> Online hour -> Coins or Credit
            </div>
        <table class="sct_table" cellspacing="0">
            <tr class="hd">
                <td>Amoount</td>
                <td>WCoinC</td>
                <td>WCoinP</td>
                <td>GoblinCoin</td>
                <td>Credit</td>
            </tr>
            <tr>
                <td>1 hour</td>
                <td>'.$rate1.'</td>
                <td>'.$rate2.'</td>
                <td>'.$rate3.'</td>
                <td>'.$rate4.'</td>
            </tr>
        </table>
            <div class="required">
                    <label for="confirm_password">Exchange:</label>
                    <input type="text" name="convert" class="inputText" size="12" maxlength="100" value="" placeholder="enter the amount" /><input type="hidden" name="coinAdd"/>
                <small>Enter the amount of hour you want to exchange.</small>
                </div>
        </fieldset>
        <fieldset>
                <div class="submit">
                    <div>
                        <input type="submit" class="inputSubmit" value="Cancel" />
                    <input type="submit" class="inputSubmit" value="Submit" />
                    </div>
                </div>
                    </fieldset>
    </form>
    ';
    }
    mssql_close($link);
    ?>