I'm pretty new to coding with php and SQL, so I'm probably going to have a lot of questions. But as the title states, I'm getting this error...

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1

I'm not sure what this is referring to. I've gone over the code as much as I can, but I can't find a syntax error. Maybe it's something I just don't know yet.

<?php 
// including the database connection file
include_once("config.php");

if(isset($_POST['update']) && isset($_GET['site']))
{    
$sitenumber = $_POST['sitenumber'];
$videolink = $_POST['videolink'];
$daynight = $_POST['daynight'];
$maxtents = $_POST['maxtents'];
$maxpersons = $_POST['maxpersons'];
$geography = $_POST['geography'];
$view = $_POST['view'];
$forestcover = $_POST['forestcover'];
$waterfront = $_POST['waterfront'];
$firepit = $_POST['firepit'];
$description = $_POST['description'];
$reslink = $_POST['reslink'];   

// checking empty fields
if(empty($sitenumber) || empty($videolink) || empty($daynight) || 
empty($maxtents) || empty($maxpersons) || empty($geography) || 
    empty($view) || empty($forestcover) || empty($waterfront) || 
empty($firepit) || empty($description) || empty($reslink)) {                
    if(empty($sitenumber)) {
        echo "<font color='red'>Site Number field is empty.</font><br/>";
    }

    if(empty($videolink)) {
        echo "<font color='red'>YouTube Link field is empty.</font><br/>";
    }

    if(empty($daynight)) {
        echo "<font color='red'>Day or overnight field is empty.</font> 
<br/>";
    }        

    if(empty($maxtents)) {
        echo "<font color='red'>Maximum Tents field is empty.</font><br/>";
    }

    if(empty($maxpersons)) {
        echo "<font color='red'>Maximum Persons field is empty.</font> 
 <br/>";
    }        

    if(empty($geography)) {
        echo "<font color='red'>Geography field is empty.</font><br/>";
    }

    if(empty($view)) {
        echo "<font color='red'>View field is empty.</font><br/>";
    }        

    if(empty($forestcover)) {
        echo "<font color='red'>Forest Cover field is empty.</font><br/>";
    }

    if(empty($waterfront)) {
        echo "<font color='red'>Waterfront Access field is empty.</font> 
 <br/>";
    }  

    if(empty($firepit)) {
        echo "<font color='red'>Firepit field is empty.</font><br/>";
    }        

    if(empty($description)) {
        echo "<font color='red'>Description field is empty.</font><br/>";
    }

    if(empty($reslink)) {
        echo "<font color='red'>Reservation Link Access field is empty. 
 </font><br/>";
    }       
} else {    
    //updating the table
    $result = mysqli_query($mysqli, "UPDATE sites SET 
 sitenumber='$sitenumber',videolink='$videolink',daynight='$daynight',
     maxtents='$maxtents',maxpersons='$maxpersons',geography='$geography', 
     view='$view',forestcover='$forestcover',waterfront='$waterfront', 
     firepit='$firepit',description='$description',reslink='$reslink' WHERE 
 sitenumber=$sitenumber");

    //redirectig to the display page. In our case, it is index.php
    //header("Location: index.php");
}
}
            echo mysqli_error($mysqli);
 ?>
<?php
//getting id from url
$sitenumber = $_GET['site'];

//selecting data associated with this particular id
$result = mysqli_query($mysqli, "SELECT * FROM sites WHERE 
sitenumber=$sitenumber");

while($res = mysqli_fetch_array($result))
{
$sitenumber = $res['sitenumber'];
$videolink = $res['videolink'];
$daynight = $res['daynight'];
$maxtents = $res['maxtents'];
$maxpersons = $res['maxpersons'];
$geography = $res['geography'];
$view = $res['view'];
$forestcover = $res['forestcover'];
$waterfront = $res['waterfront'];
$firepit = $res['firepit'];
$description = $res['description'];
$reslink = $res['reslink'];
}
            echo mysqli_error($mysqli);
?>
<html>
<head>    
<title>Edit Data</title>
</head>

<body>
<a href="index.php">Home</a>
<br/><br/>

<form name="form1" method="post" action="edit.php">
    <table border="0">
    <tr> 
            <td>Site Number</td>
            <td><input type="number" name="sitenumber" value="<?php echo 
$sitenumber;?>"></td>
        </tr>
        <tr> 
            <td>YouTube Link</td>
            <td><input type="url" name="videolink" value="<?php echo 
$videolink;?>"></td>
        </tr>
        <tr> 
            <td>Day or Overnight</td>
            <td><select name="daynight" value="<?php echo $daynight;?>">
            <option value="Day">Day</option>
            <option value="Overnight">Overnight</option></td>

        </tr>
                    <tr> 
            <td>Maximum Tents</td>
            <td><input type="number" name="maxtents" value="<?php echo 
$maxtents;?>"></td>
        </tr>
                    <tr> 
            <td>Maximum Persons</td>
            <td><input type="number" name="maxpersons" value="<?php echo 
$maxpersons;?>"></td>
        </tr>
                    <tr> 
            <td>Geography</td>
            <td><input type="text" name="geography" value="<?php echo 
$geography;?>"></td>
        </tr>
                    <tr> 
            <td>View</td>
            <td><input type="text" name="view" value="<?php echo $view;?>"> 
 </td>
        </tr>
                    <tr> 
            <td>Forest Cover</td>
            <td><input type="text" name="forestcover" value="<?php echo 
  $forestcover;?>"></td>
        </tr
                    <tr> 
            <td>Waterfront Access</td>
            <td><select name="waterfront" value="<?php echo $waterfront;?>">
            <option value="Yes">Yes</option>
            <option value="No">No</option></td>
        </tr>
                    <tr> 
            <td>Firepit Availability</td>
            <td><select name="firepit" value="<?php echo $firepit;?>">
            <option value="Yes">Yes</option>
            <option value="No">No</option></td>
        </tr>
                    <tr> 
            <td>Site Description</td>
            <td><input type="text" name="description" value="<?php echo 
$description;?>"></td>
        </tr>
                    <tr> 
            <td>Reservation Link</td>
           <td><input type="url" name="reslink" value="<?php echo $reslink;? 
>"></td>
        </tr>
            <td><input type="hidden" name="site" value="<?php echo 
$_GET['site'];?>"></td>
            <td><input type="submit" name="update" value="Update"></td>
        </tr>
    </table>
</form>
</body>
</html>

Sorry for the long code here, but I felt it was a little necessary to see the full context here.

There is also a break somewhere with the variables. The sitenumber variable isn't updating, and every variable after that is getting this error...

Notice: Undefined variable: videolink in C:\wamp\www\code\edit.php on line 124

So, this is kind of a two pronged problem. Help would be greatly appreciated.

关于wamp连接SqlServer的问题

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