php - 文件夹中的图像已删除，但图像路径未在 PHP 中更新为 null

Question

我创建了一个代码来删除文件夹中的图像，并将数据库中的 image_path 更新为 null。尽管图像删除图像，但路径不会更新为空。我花了几个小时才发现我的错误。但我做不到。任何帮助将不胜感激!

这是我的代码

<?php
//this is were images displayed
$sql    = "SELECT * FROM services WHERE user_name='wendi'";
$result = $con->query($sql);
if ($result->num_rows > 0) {
    // output data of each row
    while ($row = $result->fetch_assoc()) {
?>
                   <a href="delete.php?delete=<?= $row['id'] ?>" onclick = "return confirm('Are you sure you want to delete?')"><img src="images/template/delete.png" id="AEDbutton">delete</a>

<?php
        echo "<img border=\"0\" src=\"" . $row['image_path4'] . "\" width=\"200\"  height=\"100\">";
        echo "<br>";
    }
}


?>

这是 delete.php

<?php
include('config.php');


$sql    = "SELECT * FROM services WHERE user_name='wendi'";
$result = $con->query($sql);

while ($row = $result->fetch_assoc()) {
    $image = $row['image_path4'];
    unlink($image);

}
$sql    = "UPDATE image_path4=null, file_name4=null FROM services WHERE user_name='wendi'";
$result = $con->query($sql);


?>

Answer 1

看来您的UPDATE 查询格式不正确，the syntax应该是这样的:

UPDATE {table} SET {column}={value} WHERE {column2}={value2}

所以在你的情况下，这将是:

UPDATE services SET image_path4=null, file_name4=null WHERE user_name='wendi'