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無法從 PHP 中的 MySQL 表中的行中刪除內容?

[英]Unable to delete content from a row in MySQL table in PHP?

這是我的代碼:

$html = $_POST['html'];
$username   = $_POST['username'];
$saving     = $_POST['saving'];
$username   = $connection->real_escape_string($username);
$html       = $connection->real_escape_string($html);
$query      = $connection->query("SELECT * from members WHERE username ='$username'");
$matches    = mysqli_num_rows($query);
if ($matches == 1) {
   $row               = mysqli_fetch_array($query);
   $all_articles      = $row['readlater'];
   if($saving == true){
      $all_articles      .= $html.'§';
      $connection->query("UPDATE members SET readlater = '$all_articles' WHERE username ='$username'");
   } else {
      $all_articles      = str_replace($html.'§','',$all_articles);
      $connection->query("UPDATE members SET readlater = '$all_articles' WHERE username ='$username'");
   }
}

這是jQuery代碼:

if (localStorage.getItem(key) === null) {
    localStorage.setItem(key, 'Saved');
    $(this).css('color','#278F00');
    $(this).closest('.item').find('.fa-bookmark-o').css('font-weight','bold');
    $.ajax({
      type: "POST",
      url: '/savedarticle.php',
      data: {
        html: innerHTML,
        username: '<?php echo $_SESSION['user']; ?>',
        saving: true        
    }
  }); 
}else {
    localStorage.removeItem(key);
    $(this).css('color','#000');
    $(this).closest('.item').find('.fa-bookmark-o').css('font-weight','normal');
    $.ajax({
      type: "POST",
      url: '/savedarticle.php',
      data: {
        html: innerHTML,
        username: '<?php echo $_SESSION['user']; ?>',
        saving: false       
      }
    }); 
}

我是 HTML 到以§作為分隔符的一行,因為這個字符不會出現在普通的 HTML 中。 如果文章已經在行中並且用戶點擊了取消保存按鈕,我想使用str_replace刪除文章,但它不會替換任何內容。

此外,當我僅在文章被保存兩次后單擊保存按鈕時。 我以后可能會解決。

編輯:我猜$saving變量總是傳遞值 true。 這也導致多次保存同一文章。

我需要關於刪除未保存文章的幫助,也想知道是否有更好的方法來做到這一點。

這是示例 HTML 塊:

<h2>Nexus 5X Receiving Update Today to Build MDB08I<small class="label droidlife">Droid Life</small><button type="button" class="close bkmrk-btn" style="color: rgb(0, 0, 0);"><i class="fa fa-bookmark-o" style="font-weight: normal;"></i></button></h2><p>Nexus 5X devices that are arriving at the homes of Android fans today are receiving a small 42MB update almost immediately out of the box. The build is arriving as&nbsp;MDB08I, which is a build first seen as a factory image earlier in the week.&nbsp; Tough to know what’s new in it, but it’s likely...</p><p>Read More — <a data-id="1445529719-Unv5Og" data-toggle="modal" class="modal-link store-link" href="http://www.droid-life.com/2015/10/21/nexus-5x-receiving-update-today-to-build-mdb08i/" data-target="#myModal">Nexus 5X Receiving Update Today to Build MDB08I</a></p><hr>§

你在處理錯誤的事情。 與其將所有文章存儲在由魔術字符分隔的單個字段中,您還應該擁有一個包含用戶名和文本字段的單獨表。 然后,您可以為每個用戶在該表中任意添加和刪除多行。 當您想獲取用戶的所有結果時,只需執行SELECT * FROM new_table_name WHERE username = 'some_user_name'

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