php – 如何在下面的示例中删除数据库行？

我有一个取消按钮,用户可以取消文件上传,它将显示取消消息.现在我想要发生的是,当用户点击“取消”按钮时,它将查找已在数据库中取消的文件名并删除数据库行.问题是它根本没有删除数据库行.我怎样才能实现这一点.目前我正在使用jpuery.ajax方法,您可以在下面的代码中看到.

下面是表单代码：

var $fileImage = $("<form action='imageupload.php' method='post' enctype='multipart/form-data' target='upload_target' onsubmit='return imageClickHandler(this);' class='imageuploadform' >" + 

 "Image File: <input name='fileImage' type='file' class='fileImage' /></label><br/><br/><label class='imagelbl'>" + 

 "<input type='submit' name='submitImageBtn' class='sbtnimage' value='Upload' /></label>" + 

 "</p><p class='imagef1_cancel' align='center'><label>" + 

 "<input type='button' name='imageCancel' class='imageCancel' cancel_image_file_name='" + imagefilename + "' value='Cancel' /></label></form>");

以下是取消按钮功能：

$('.imagef1_cancel').eq(window.lastUploadImageIndex).find(".imageCancel").on("click",function(event) {

        var cancel_image_file_name = $(this).attr('cancel_image_file_name');

    jQuery.ajax("cancelimage.php?imagefilename=" + cancel_image_file_name)

    return stopImageUpload(2,cancel_image_file_name);

});

最后下面是jquery.ajax导航到的cancelimage.php脚本,据说可以删除包含文件名的数据库行：

<?php

...

    //I have connected to database

    $cancel_image_file_name = $_GET["imagefilename"];

            $imagecancelsql = "DELETE FROM Image 
            WHERE ImageFile = 'ImageFiles/". mysql_real_escape_string($cancel_image_file_name)."'";

        mysql_query($imagecancelsql);

        mysql_close();


    ?>

更新：

下面是我回显删除查询时当前显示的内容：

注意：未定义的索引：第19行/web/stud/xxx/…/cancelimage.php中的imagefilename
DELETE FROM Image WHERE ImageFile =’ImageFiles /’

下面是删除功能的代码,当按下Delete按钮时,它将导航到deleteimage.php脚本并删除数据库行：

function stopImageUpload(success,imagefilename){

         $('.listImage').eq(window.lastUploadImageIndex).append('<div>' + htmlEncode(imagefilename) + '<button type="button" class="deletefileimage" image_file_name="' + imagefilename + '">Remove</button><br/><hr/></div>'); 

$('.listImage').eq(window.lastUploadImageIndex).find(".deletefileimage").on("click",function(event) {
    var image_file_name = $(this).attr('image_file_name');

    jQuery.ajax("deleteimage.php?imagefilename=" + image_file_name)

    $(this).parent().remove();
});

      return true;   
}

以下是deleteimage.php脚本：

<?php

//connected to DB

  $image_file_name = $_GET["imagefilename"];

        $imagedeletesql = "DELETE FROM Image 
        WHERE ImageFile = 'ImageFiles/". mysql_real_escape_string($image_file_name)."'";

    mysql_query($imagedeletesql);

    mysql_close();


?>

以下是取消按钮功能现在的更新：

function startImageUpload(imageuploadform,imagefilename){
            $('.imagef1_cancel').eq(window.lastUploadImageIndex).find(".imageCancel").on("click",function(event) {

var cancel_image_file_name_ = $(this).attr('css');
var cancel_image_file_name = '';
var style_array = cancel_image_file_name_.split(" ");
for(i=0;i<style_array.length;i++){
    if(style_array[i].substr(0,2) == "__"){
     cancel_image_file_name = style_array[i].slice(2,style_array[i].length-2);
}

}

    jQuery.ajax("cancelimage.php?imagefilename=" + cancel_image_file_name)

    return stopImageUpload(2,cancel_image_file_name);

});       
      return true;
}

我将按钮输入标签更改为取消按钮：

<input type='button' name='imageCancel' class='imageCancel __"+ imagefilename + "' value='Cancel' />

<input type='button' name='imageCancel' class='imageCancel __"+ imagefilename + "' value='Cancel' /></label></form>

var cancel_image_file_name_ = $(this).attr('class');
var cancel_image_file_name = '';
var style_array = cancel_image_file_name_.split(" ");
for(i=0;i<style_array.length;i++){
    if(style_array[i].substr(0,style_array[i].length);
}

}