Question

我对使用php和SQL编码很新，所以我可能会遇到很多问题。但正如标题所述，我收到了这个错误......

您的SQL语法有错误;检查与MySQL服务器版本对应的手册，以便在第1行的''附近使用正确的语法

我不确定这是指什么。我已经尽可能多地查看了代码，但是我找不到语法错误。也许这是我还不知道的事情。

<?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>

很抱歉这里有长代码，但我觉得有必要在这里查看完整的上下文。

在变量的某个地方也有一个突破。 sitenumber变量没有更新，之后的每个变量都会出现此错误...

注意：未定义的变量：第124行的C：\ wamp \ www \ code \ edit.php中的视频链接

所以，这是一个双管齐下的问题。非常感谢帮助。

Answer 1

纠正这个：

$result = mysqli_query($mysqli, "SELECT * FROM sites WHERE sitenumber='".$sitenumber."' ");

而且：

$result = mysqli_query($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'");

Answer 2

您的SQL查询似乎很好，但问题可能来自您的变量值。

由于您的查询未正确转义（以及it should be for better security），我建议您在执行前调试查询。通过这种方式，您将能够了解数据库中将要执行的内容。

如果您不使用xdebug，则可以将查询放入变量中，然后使用var_dump转储它。

然后，打开phpmyadmin（我假设您至少可以访问它），并将变量的值（这是您的查询）粘贴到SQL编辑器中。然后执行它，你应该有一条消息说明错误的位置。通过查看哪个变量具有错误的值（例如，它包含'或"），它将帮助您理解为什么使用预准备语句很重要。

我希望它会有所帮助

您的SQL语法有错误; - 和未定义的变量错误 - 可能已连接

2 个答案: