使用ajax和php从数据库中删除图像

Question

我正在尝试使用 ajax 删除图像。它显示数据已被删除但在表中记录在那里的警报消息。如何从表中删除图像记录....

<span><input type="submit" id="del_btn" value="Delete Image" /></span>
<script type="text/javascript">
$(document).ready(function () {
    $("input#del_btn").click(function(){
         $.ajax({
             type: "POST",
             url: "del.php", // 
             data: {id: <?php echo $delid; ?>},
             success: function(msg){
             alert("Image Deleted from database");  
             },
             error: function(){
             alert("failure");
           }
           });
        });
    });
  </script>

这是del.php

<?php
if (isset($_POST['id'])) {
    $imgid = $_POST['id'];
    $con=new PDO("mysql:host=localhost;dbname=newimg","root","");
    $sql = "DELETE FROM attempt010 WHERE id='$imgid' ";
    $con->execute($sql);
}
?>

Answer 1

PDO execute 函数执行准备好的语句。所以你需要准备然后执行。准备好的语句也应该参数化。试试：

if (isset($_POST['id'])) {
    $imgid = $_POST['id'];
    $con=new PDO("mysql:host=localhost;dbname=newimg","root","");
    $sql = "DELETE FROM attempt010 WHERE id=?";
    $stmt = $con->prepare($sql);
    $stmt->execute(array($imgid));
}

欲了解更多信息，请参阅：

1. http://php.net/manual/en/pdostatement.execute.php
2. http://php.net/manual/en/pdo.prepare.php
3. http://php.net/manual/en/pdo.prepared-statements.php