我对用php和sql编码还很陌生，所以我可能会有很多问题。但正如标题所说，我得到了这个错误。。。
sql语法有错误；请查看与mysql服务器版本对应的手册，以获取在第1行的“”附近使用的正确语法
我不知道这是指什么。我已经尽可能多地检查了代码，但找不到语法错误。也许我还不知道。
<?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>很抱歉这里的代码太长，但我觉得有必要在这里看到完整的上下文。
变量也有一个中断。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：c:\wamp\www\code\edit.php中的videolink，第124行
所以，这是一个双管齐下的问题。我们将不胜感激。
2条答案
按热度按时间uyhoqukh1#
更正此问题：
还有这个：
oyxsuwqo2#
sql查询看起来不错，但问题可能来自变量的值。
由于您的查询没有正确转义（这应该是为了更好的安全性），我建议您在执行查询之前调试查询。通过这种方式，您将能够理解将在数据库中执行什么。
如果不使用xdebug，只需将查询放入变量中，然后使用
var_dump.然后，打开phpmyadmin（我假设您至少有权访问它），并将变量的值（即您的查询）粘贴到sql编辑器中。然后执行它，就会有一条消息解释错误在哪里。它将帮助您了解为什么使用prepared语句很重要，因为它可以看到哪个变量的值是错误的（这意味着它包含一个
'或者"，例如）。我希望这会有帮助