繁体   English   中英

使用复选框从表中删除行

[英]Delete rows from table using checkboxes

我试图基于复选框从表中删除多行,但是我不太确定如何最好地解决它。 目前,我有一部电影列表,并且我希望能够根据是否已选择来删除其中一部或多部电影。

// Update Watchlist
    if ($submit == 'Update Watchlist') { 
        require_once("db_connect.php");

        $watchlist_name = clean_string($_POST['watchlist-name']);
        $watchlist_description = clean_string($_POST['watchlist-description']);
        $watchlist_category = $_POST['watchlist-category'];

        $updateWatchlist_bad_message = '';

        if (!empty($watchlist_name)) {
            if ($watchlist_name = clean_string($watchlist_name)) {
                $update_watchlist_name_query = "UPDATE watchlists SET name = '$watchlist_name' WHERE watchlist_id = " . $watchlist_id;
                mysql_query($update_watchlist_name_query) or die("Insert failed. " . mysql_error() . "<br />" . $$update_watchlist_name_query);
            }
        } 
        if (!empty($watchlist_description)) {
            if ($watchlist_description = clean_string($watchlist_description)) {
                $update_watchlist_description_query = "UPDATE watchlists SET description = '$watchlist_description' WHERE watchlist_id = " . $watchlist_id;
                mysql_query($update_watchlist_description_query) or die("Insert failed. " . mysql_error() . "<br />" . $$update_watchlist_description_query);
            }
        }
        if ($watchlist_category != "") {
            $update_watchlist_category_query = "UPDATE watchlists SET category = '$watchlist_category' WHERE watchlist_id = " . $watchlist_id;
            mysql_query($update_watchlist_category_query) or die("Insert failed. " . mysql_error() . "<br />" . $$update_watchlist_category_query);
        }
        if(isset($_POST['film-name'])) {
            $checkbox = $_POST['film-name'];
            $count = count($checkbox);

            for($i = 0; $i < $count; $i++) {
                $id = (int) $checkbox[$i]; // Parse your value to integer

                if ($id > 0) { // and check if it's bigger then 0
                    mysql_query("DELETE FROM watchlist_films WHERE film_id = $rt_id");
                }
            }
        } else {
            $updateWatchlist_bad_message = '<div class="alert alert-error">Sorry, but we can\'t do that at the minute. Please try again later.</div>';
        }
        require_once("db_close.php");?>
        <script type="text/javascript">
            window.location = "watchlist.php?id=<?php echo $watchlist_id; ?>"
        </script><?php
    }

适当的字符串是电影名称,并且我尝试使用此解决方案-PHP删除带有多个复选框的SQL行 -但是,由于电影没有从其包含的监视列表中删除,因此它不起作用。

基本上,查询的逻辑如下:

  • 检查是否选中了一个复选框
  • 如果勾选了一个复选框,请检查是否也勾选了其他复选框
  • 从监视列表中删除所有已勾选的电影

我不确定以上是否是最简单的方法,例如,检查是否勾选了多个复选框可能更简单,更干净,而不是先检查是否勾选了任何复选框,然后再进行检查如果其他人也是如此。

UPDATE

只是想我将提供更多信息来阐明-下面显示了我在监视列表中显示的所有电影的实际foreach(为格式道歉):

foreach ($films as $key => $film_item) {
    include ("watchlist-film-controller.php");?>    
    <label class="checkbox input-block-level">
      <p class="pull-right"><?php echo $title; ?></p>
      <input type="checkbox" class="input-block-level" name="film-name[]" 
             value="<?php echo $title; ?>">
    </label><?php
}

更新2

为了回答这篇文章中的两个(非常感谢!)评论,这里有更多有关当前情况的信息。 我已经尝试过两种解决方案,但是都没有用。 就目前而言,我已经实现了didierc提供的解决方案,目前我的代码如下所示:

<?php
/*
        ini_set('display_errors', 1);
    error_reporting(E_ALL);
*/
    $rt_id = $film_item['film_id'];
    $watchlist_id = $_GET['id'];

    include_once('/api/RottenTomatoes.php');
    $rottenTomatoes = new RottenTomatoes('2b2cqfxyazbbmj55bq4uhebs', 10, 'us');

    /* echo "<pre>"; */
    try {
        $result = $rottenTomatoes->getMovieInfo($rt_id);
        //print_r($result);
    } catch (Exception $e) {
        //print_r($e);
    }
    /* echo "</pre>"; */

    $title = $result['title'];
    $year = $result['year'];
    $critics_consensus = $result['critics_consensus'];
    $poster_thumb = $result['posters']['thumbnail'];

    // Update Watchlist
    if ($submit == 'Update Watchlist') { 
        require_once("db_connect.php");

        $watchlist_name = clean_string($_POST['watchlist-name']);
        $watchlist_description = clean_string($_POST['watchlist-description']);
        $watchlist_category = $_POST['watchlist-category'];

        $updateWatchlist_bad_message = '';

        if (!empty($watchlist_name)) {
            if ($watchlist_name = clean_string($watchlist_name)) {
                $update_watchlist_name_query = "UPDATE watchlists SET name = '$watchlist_name' WHERE watchlist_id = " . $watchlist_id;
                mysql_query($update_watchlist_name_query) or die("Insert failed. " . mysql_error() . "<br />" . $$update_watchlist_name_query);
            }
        } 
        if (!empty($watchlist_description)) {
            if ($watchlist_description = clean_string($watchlist_description)) {
                $update_watchlist_description_query = "UPDATE watchlists SET description = '$watchlist_description' WHERE watchlist_id = " . $watchlist_id;
                mysql_query($update_watchlist_description_query) or die("Insert failed. " . mysql_error() . "<br />" . $$update_watchlist_description_query);
            }
        }
        if ($watchlist_category != "") {
            $update_watchlist_category_query = "UPDATE watchlists SET category = '$watchlist_category' WHERE watchlist_id = " . $watchlist_id;
            mysql_query($update_watchlist_category_query) or die("Insert failed. " . mysql_error() . "<br />" . $$update_watchlist_category_query);
        }
        if(isset($_POST['film-name'])) {
            $films = array_map('intval', $_POST['film-name']); // make sure that every film id is an integer
            mysql_query("DELETE FROM watchlist_films WHERE film_id IN (" . implode(',', $films) . ") AND watchlist_id = " . $watchlist_id);
        } else {
            $updateWatchlist_bad_message = '<div class="alert alert-error">Sorry, but we can\'t do that at the minute. Please try again later.</div>';
        }
        require_once("db_close.php");?>
        <script type="text/javascript">
            window.location = "watchlist.php?id=<?php echo $watchlist_id; ?>"
        </script><?php
    }

$rt_id是每部电影的唯一ID,并会传递给表单,因此查询知道在这种情况下应删除哪部电影。 影片的名称仅用于使实际的删除形式更易于阅读,而不是打印ID号列表,因为用户将无法知道哪个ID与哪部影片匹配。 在尝试了给出的两种解决方案后,它们似乎都没有起作用,但是没有错误返回-表单已提交,但是所选影片不会从监视列表中删除。

更新3

为了回应Didierc的评论,以下是发生了什么的完整分解:

  • 监视列表分为两个表- watchlistswatchlist_films watchlists包含简单的信息,例如监视列表ID,名称和描述,以及创建监视列表的用户的用户ID。 watchlist_films仅包含监视列表ID和监视列表包含的电影ID( $rt_id )。 甲监视列表占用在单个行watchlists在表中和多个行watchlist_films表(作为一个监视列表可以有多个膜)。
  • 电影信息是从Rotten Tomatoes和TMDb API中获取的,这就是电影ID( $rt_id )的来源-每部电影都有一个完全唯一的$rt_id

监视列表的完整“处理代码”在Update 2中 ,但是HTML呈现如下:

<?php 
    include("checklog.php"); 
    require_once("watchlist-controller.php");
?>
<!DOCTYPE html>

    <head>

        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <link rel="shortcut icon" href="img/fav.ico">
        <link rel="apple-touch-icon" href="img/apple-touch-icon.png">
        <title>Screening - Your ticket to your movies - <?php echo $watchlist_name; ?></title>
        <meta name="description" content="Screening is a brand new take on the traditional movie database, fusing social networking and multimedia to provide a clear, concise experience allowing you to share your favourite movies, and discover new classics.">
        <meta name="keywords" content="Movies, Films, Screening, Discover, Watch, Share, experience, database, movie database, film database, share film, share films, discover film, discover films, share movie, share movies, discover movie, discover movies">

        <!-- Bootstrap -->
        <link href="css/bootstrap.css" rel="stylesheet" media="screen">
        <link href="css/bootstrap-responsive.css" rel="stylesheet">
        <link href="css/custom-bootstrap.css" rel="stylesheet">
        <link rel="stylesheet" href="fonts.css" type="text/css" />
        <link rel="stylesheet/less" type="text/css" href="css/stylesheet.less" />
        <script src="js/less-1.3.3.min.js" type="text/javascript"></script>
        <script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js"></script>
        <script src="js/bootstrap.min.js"></script>

        <!-- Start Google Analytics -->
        <script type="text/javascript">

          var _gaq = _gaq || [];
          _gaq.push(['_setAccount', 'UA-36943512-1']);
          _gaq.push(['_trackPageview']);

          (function() {
            var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
            ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
            var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
          })();

        </script>
        <!-- End Google Analytics -->

        <!-- Start Google Analytics -->
        <script type="text/javascript">

          var _gaq = _gaq || [];
          _gaq.push(['_setAccount', 'UA-36943512-1']);
          _gaq.push(['_trackPageview']);

          (function() {
            var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
            ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
            var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
          })();

        </script>
        <!-- End Google Analytics -->

    </head>

    <body>

        <div class="container"><?php 
            require_once ("header.php");?>

            <div class="well main-content">

                <p class="page-title"><?php echo $watchlist_name; ?></p>

                <div class="row-fluid">

                    <section class="span3 sidebar pull-left">

                        <p class="sidebar-text"><span class="bold">NAME: </span><?php echo $watchlist_name; ?></p>
                        <p class="sidebar-text"><span class="bold">CATEGORY: </span><?php echo $watchlist_category; ?></p>
                        <div class="alert alert-info"><?php echo $watchlist_description; ?></div>

                        <a href="#watchlistUpdate" class="btn btn-primary btn-block" data-toggle="modal" title="Update Watchlist">Update Watchlist</a>
                        <a href="#watchlistDelete" class="btn btn-danger btn-block" data-toggle="modal" title="Delete Watchlist">Delete Watchlist</a>
                        <a href="profile.php" class="btn btn-block" title="Logout">Your Profile</a>


                    </section>

                    <section class="span9 watchlist-holder">

                        <!-- Loading bar -->
                        <!--
<div class="progress progress-striped active">
                            <div class="bar" style="width: 100%;"></div>
                        </div>
-->

                        <ul class="unstyled"><?php

                            foreach($films as $key => $film_item) {
                                include ("watchlist-film-controller.php");?>
                                <li class="well list-item clearfix">

                                    <div class="row-fluid">
                                        <a href="movie.php?id=<?php echo $rt_id; ?>" class="span1 pull-left" title="<?php echo $title; ?>"><img src="<?php echo $poster_thumb; ?>" alt="<?php echo $title; ?> poster" title="<?php echo $title; ?> poster" /></a>

                                        <div class="span11 movie-info">
                                            <p class="search-title"><a href="movie.php?id=<?php echo $film_item['film_id']; ?>" title="<?php echo $title; ?> (<?php echo $year; ?>)"><?php echo $title; ?></a> <small>(<?php echo $year; ?>)</small></p><?php

                                            if ($critics_consensus == "") {?>
                                                <p class="watchlist-synopsis">No overview available</p><?php
                                            } else {?>
                                                <p class="watchlist-synopsis"><?php echo $critics_consensus; ?></p><?php
                                            }?>

                                        </div>
                                    </div>

                                </li><?php
                            }?>

                        </ul>

                    </section>

                    <div id="watchlistUpdate" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="watchlistUpdateLabel" aria-hidden="true">

                        <div class="modal-header">
                            <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
                            <h3 id="watchlistUpdateLabel" class="modal-title">Update Watchlist</h3>
                        </div>

                        <form name="watchlist-updater" class="watchlist-updater" action="watchlist.php?id=<?php echo $watchlist_id; ?>" method='POST'>

                            <div class="modal-body">

                                 <?php echo $updateWatchlist_bad_message; ?>

                                 <div class="alert alert-info">Use the boxes below to change the Watchlist name and description</div>

                                 <input type="text" class="input-block-level" name="watchlist-name" alt="watchlist-name" placeholder="<?php echo $watchlist_name; ?>">
                                 <textarea rows="3" class="input-block-level" name="watchlist-description" title="Watchlist Description" placeholder="<?php echo $watchlist_description; ?>"></textarea>

                                <label for="Watchlist Category" class="pull-left inline-label" title="Watchlist Category">Watchlist Category</label>
                                    <select class="input-block-level" name="watchlist-category" title="Watchlist Category">
                                    <option value="" title=""></option>
                                    <option value="General" title="General">General</option>
                                    <option value="To watch" title="To watch">To watch</option>
                                    <option value="To share" title="To share">To share</option>
                                    <option value="Favourites" title="Favourites">Favourites</option>
                                </select>   

                                 <div class="alert alert-info">Use the checkbox to the left of each film to remove it from the Watchlist</div><?php

                                foreach ($films as $key => $film_item) {
                                    include ("watchlist-film-controller.php");?>    
                                    <label class="checkbox input-block-level">
                                        <p class="pull-right"><?php echo $title; ?></p>
                                        <input type="checkbox" class="input-block-level" name="film-name" value="<?php echo $title; ?>">
                                    </label><?php
                                }?>

                            </div>

                            <div class="modal-footer">
                                <button type="button" class="btn" data-dismiss="modal" aria-hidden="true">Close</button>
                                <button type="submit" class="btn btn-success" name="submit" value="Update Watchlist">Update Watchlist</button>
                            </div>
                        </form>
                    </div>

                    <div id="watchlistDelete" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="watchlistDeleteLabel" aria-hidden="true">
                        <div class="modal-header">
                            <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
                            <h3 id="watchlistDeleteLabel" class="modal-title">Delete Watchlist</h3>
                        </div>

                        <div class="modal-body">

                            <?php echo $deleteWatchlist_bad_message; ?>

                            <div class="alert alert-error alert-block">
                                 <p>Deleting this Watchlist will delete all its containing films from your profile. This information will not be recoverable.</p>
                                 <p>Please only delete this Watchlist if you are absolutely sure you want to purge all the information it contains.</p>
                             </div>

                              <p>Are you sure you want to delete this Watchlist?</p>

                        </div>

                        <div class="modal-footer">
                            <form name="watchlist-delete" class="watchlist-delete" action="watchlist.php?id=<?php echo $watchlist_id; ?>" method="POST"><?php
                                include ("watchlist-film-controller.php");?>
                                <button type="button" class="btn" data-dismiss="modal" aria-hidden="true">Do not delete this Watchlist</button>
                                <button type="submit" class="btn btn-danger" name="submit" value="Delete Watchlist">Delete Watchlist</button>
                            </form>
                        </div>
                    </div>

                </div>

            </div>

            <?php include 'footer.html'; ?>

        </div>

    </body>

</html>

监视列表的实际更新在#updateWatchlist模式中。 需要更多信息,我很乐意提供!

我认为问题之一是您正在通过$rt_id删除。 但是,在前面的行中,它仅称为id 除此之外,我现在看不到任何明显的问题。 如果那不起作用,请尝试将要发送到数据库的SQL查询打印出来,方法是将mysql_query替换为echo并提供给我们输出。

另外,还有一个快速提示:现在,您正在逐部删除电影。 根据所选择的电影数量,这可能会引起明显的性能影响。 如何在一个查询中将它们全部删除?

if(isset($_POST['film-name'])) {
    $films = array_map('intval', $_POST['film-name']); // make sure that every film id is an integer
    mysql_query("DELETE FROM watchlist_films WHERE film_id IN (" . implode(',', $films) . ")");
}

一些奇怪的事情:

  1. 在您的删除循环中,您从$checkbox检查了$id ,但是您使用了$rt_id :我认为这是它不起作用的原因。

  2. 对于监视列表描述,您可以在其上调用clean_string两次,一次是从$_POST获取一次,另一次是检查其是否为空。

  3. 复选框值实际上是电影标题,而不是电影ID,您可能应该解决该问题,或在表单流程脚本中检索相应的ID。

  4. 您将删除具有给定影片ID的所有条目,但可能应该仅是与特定观看列表相关的条目。

关于删除过程,您可以使其成为一个查询:

$range = implode(',', array_filter(
     array_map('intval', $checkbox),
     function($v){ return $v > 0; }));

$update_query = 'DELETE FROM watchlist_films WHERE film_id IN ('.$range.") AND watchlist_id = '" . $watchlist_id."'";

在您发表评论后,让我详细说明:

  1. 从表单复选框中检索到的值在表单生成中称为$title ,我想您在watchlist-film-controller.php计算该值,因为它在其他任何地方都没有出现。 但是您需要删除表中的行的值为$ rt_id 如何从该$title计算$rt_id

基本上,您的复选框value 应为 $rt_id ,以便在表单处理中,您不必再次查找该值。 我非常确定,对于给定的电影标题,您可能会获得多个电影ID,因此您不能仅仅依靠标题来删除监视列表中的条目。 假设某人的监视列表中有所有名为“ True Grit”的电影,如果她选择删除其中一部,您将如何处理?

请考虑将来将代码移至PDO或mysqli API,以实现更安全的数据清理。

暂无
暂无

声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.

 
粤ICP备18138465号  © 2020-2024 STACKOOM.COM