我正在制作一个应用程序来保护你家的门窗。该应用程序完成了80%，但我不知道如何删除一扇门的数据库记录。问题是我找不到一种方法来读出正确的数据来删除记录。你能看看我为删除页写的剧本吗？
我有一个页面可以在表格中插入所有数据，以概述所有"连接"到应用程序的设备。
<section>
<form action="verwijderen.php" method="post">
<?php
$sql = "SELECT device_id, naam, plaats.plaats, type.type, status FROM devices, type, plaats, status
WHERE devices.type_id = type.type_id
AND plaats.plaats_id = devices.plaats_id
AND status.status_id = devices.status_id";
$result = $con->query($sql);
if ($result->num_rows > 0)
{
echo '<table><tr><td>ID</td><td>Naam</td><td>Plaats</td><td>Type</td><td>Status</td><td>Verwijderen</td></tr>';
while($row = $result->fetch_assoc())
{
echo '<tr>';
echo '<td>' .$row['device_id']. '</td>';
echo '<td>' .$row['naam']. '</td>';
echo '<td>' .$row['plaats']. '</td>';
echo '<td>' .$row['type']. '</td>';
echo '<td>' .$row['status']. '</td>';
echo '<td>';
?>
<input type="submit" value="Verwijderen" name="submit">
</form>
<?php '</td>';
}
echo '</table>';
}
?>
</section>
我拥有的另一个页面是删除插入表中的记录的页面。删除的问题是我找不到删除记录的方法。用$_POST/$_GET在html中将记录添加到数据库中效果良好。。
<?php
error_reporting(E_ERROR);
include '../dbconnect.php';
//$connection = mysql_connect("", "", ""); // Establishing Connection with Server
//$db = mysql_select_db("cerar", $connection); // Selecting Database from Server
if(isset($_POST['submit']))
{ // Fetching variables of the form which travels in URL
}
mysqli_close($con); // Closing Connection with Server
//header( "refresh:3;url=index.php" );
?>
为表的每一行创建一个表单，并包含一个隐藏的输入字段，其中包含要传递给服务器的键值。因此，将打开的form标记移到您拥有的input type="submit"之前，并包含另一个隐藏的输入，如下所示：
<form action="verwijderen.php" method="post">
<input type="hidden" value="<?=$row['device_id']?>" name="device_id">
<input type="submit" value="Verwijderen" name="submit">
</form>
然后在PHP中，您可以在$_POST['device_id']中找到必须删除的设备id。写delete语句应该很容易。
<section>
<form action="verwijderen.php" method="post">
<?php
$sql = "SELECT device_id, naam, plaats.plaats, type.type, status FROM devices, type, plaats, status WHERE devices.type_id = type.type_id AND plaats.plaats_id = devices.plaats_id AND status.status_id = devices.status_id";
$result = $con->query($sql);
if ($result->num_rows > 0) {
echo '<table>
<thead>
<tr>
<th>ID</th>
<th>Naam</th>
<th>Plaats</th>
<th>Type</th>
<th>Status</th>
<th>Verwijderen</th>
</tr>
</thead>
<tbody>';
while($row = $result->fetch_assoc()){
echo '<tr>';
echo '<td>' .$row['device_id']. '</td>';
echo '<td>' .$row['naam']. '</td>';
echo '<td>' .$row['plaats']. '</td>';
echo '<td>' .$row['type']. '</td>';
echo '<td>' .$row['status']. '</td>';
echo '<td>';?>
<input type="hidden" value="<?php echo $row['device_id']; ?>" name="device_id">
<input type="submit" value="Verwijderen" name="submit">
<?php '</td>';
}
echo '</tbody>
</table>';
}
?>
</form>
</section>
PHP代码
<?php
error_reporting(E_ERROR);
include '../dbconnect.php';
extract($_POST);
//$connection = mysql_connect("", "", ""); // Establishing Connection with Server
//$db = mysql_select_db("cerar", $connection); // Selecting Database from Server
if(isset($_POST['submit']) && $_POST['submit'] == 'Verwijderen')
{
//delete query
//DELETE FROM devices WHERE device_id = $device_id
}
mysqli_close($con); // Closing Connection with Server
//header( "refresh:3;url=index.php" );
?>