Php JsTree delete_node（）删除子节点

我用jQuery树插件JSTree、PHP和MySQL创建了一个treeview，并使用contextmenu创建、重命名和删除节点。 treeview的所有节点都依赖于服务器端处理

这是我的数据库上的表结构：

CREATE TABLE IF NOT EXISTS `treeview_items` (
`id` int(11) NOT NULL,
  `name` varchar(200) NOT NULL,
  `text` varchar(200) NOT NULL,
  `parent_id` varchar(11) NOT NULL
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=latin1;

这是my index.html（在div容器中）上的JsTree方法

这是response.php文件，用于将节点信息更新到mysql数据库中

<?php

// THIS IS AN EXAMPLE DATABASE CONNECTION
$servername = "localhost";
$database = "myDatabase";
$username = "root";
$password = "password";

try { 
    $db = new PDO("mysql:host=$servername;dbname=$database", $username, $password);
    // set the PDO error mode to exception
    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    /* echo "Connected successfully"; */
} catch(PDOException $e) {
    /* echo "Connection failed: " . $e->getMessage() . "\n"; */
    header('Location: /public/error_page');
    exit;
}

    $table_name = "`treeview_items`";

    // CREATE, RENAME, DELETE NODE
    if(isset($_GET['operation'])) {

        try {

            $result = null;

            switch($_GET['operation']) {

                case 'get_node':

                    $node = isset($_GET['id']) && $_GET['id'] !== '#' ? (int)$_GET['id'] : 0;
                    $sql = "SELECT * FROM " . $table_name;

                    $res = $db->prepare($sql);
                    $res->execute();


                    // Iterate on results row and create new index array of data
                    while($row = $res->fetch(PDO::FETCH_ASSOC)) { 
                        $data[] = $row;
                    }
                    $itemsByReference = array();

                    // Build array of item references:
                    foreach($data as $key => &$item) {
                       $itemsByReference[$item['id']] = &$item;
                       // Children array:
                       $itemsByReference[$item['id']]['children'] = array();
                       // Empty data class (so that json_encode adds "data: {}" ) 
                       $itemsByReference[$item['id']]['data'] = new StdClass();
                    }

                    // Set items as children of the relevant parent item.
                    foreach($data as $key => &$item) {
                        if($item['parent_id'] && isset($itemsByReference[$item['parent_id']])) {
                            $itemsByReference [$item['parent_id']]['children'][] = &$item;
                        }
                    }

                    // Remove items that were added to parents elsewhere:
                    foreach($data as $key => &$item) {
                       if($item['parent_id'] && isset($itemsByReference[$item['parent_id']])) {
                           unset($data[$key]);
                        }
                    }

                    $result = $data;
                    break;

                case 'create_node':

                    $node = isset($_GET['id']) && $_GET['id'] !== '#' ? (int)$_GET['id'] : -1;

                    if($node == -1) break;

                    $node_text = isset($_GET['text']) && $_GET['text'] !== '' ? $_GET['text'] : '';
                    $sql = "INSERT INTO " . $table_name . " (`name`, `text`, `parent_id`) VALUES('" . $node_text . "', '" . $node_text . "', '" . $node . "')";

                    $res = $db->prepare($sql);
                    $res->execute();

                    $result = array('id' => $db->lastInsertId());

                    break;

                case 'move_node':

                    $node = isset($_GET['id']) && $_GET['id'] !== '#' ? (int)$_GET['id'] : -1;
                    $node_new_parent = isset($_GET['new_parent_id']) && $_GET['new_parent_id'] !== '#' ? (int)$_GET['new_parent_id'] : -1;

                    if($node == -1 || $node_new_parent == -1) break;

                    $sql ="UPDATE " . $table_name . " SET `parent_id` = '" . $node_new_parent . "' WHERE `id` = '" . $node . "'";

                    $res = $db->prepare($sql);
                    $res->execute();

                    break;

                case 'rename_node':

                    $node = isset($_GET['id']) && $_GET['id'] !== '#' ? (int)$_GET['id'] : 0;           
                    $node_text = isset($_GET['text']) && $_GET['text'] !== '' ? $_GET['text'] : '';

                    $sql = "UPDATE " . $table_name . " SET `name`='" . $node_text . "',`text`='" . $node_text . "' WHERE `id`= '" . $node . "'";

                    $res = $db->prepare($sql);
                    $res->execute();

                    break;

                case 'delete_node':

                    $node = isset($_GET['id']) && $_GET['id'] !== '#' ? (int)$_GET['id'] : 0;

                    $sql ="DELETE FROM " . $table_name . " WHERE `id`= '" . $node ."'";

                    $res = $db->prepare($sql);
                    $res->execute();

                    break;

                default:
                    throw new Exception('Unsupported operation: ' . $_GET['operation']);
                    break;

            }

            header('Content-Type: application/json; charset=utf-8');
            echo json_encode($result);

        } catch (Exception $e) {

            header($_SERVER["SERVER_PROTOCOL"] . ' 500 Server Error');
            header('Status:  500 Server Error');
            echo $e->getMessage();
        }
        die();
    }

?>

---

您可以添加新案例：

case 'delete_node_with_children':

    $node = isset($_GET['id']) && $_GET['id'] !== '#' ? (int)$_GET['id'] : 0;

    $sql = "DELETE FROM {$table_name} WHERE id = :node OR parent_id = :node";

    $res = $db->prepare($sql);
    $res->execute(['node' => $node]);

    break; 

或，作为更好的方法，我建议您使用

顺便说一下，您应该使用预处理语句，以避免像我的代码中那样使用SQL注入。有关详细信息：
添加一个新案例它可以工作，但只删除选定的节点和直接子节点，而不删除子节点的子节点。在我上面的例子中，如果“文件夹6”有一个子文件夹，则后者不会被删除。我将尝试使用Mysql触发器，或者像这个问题一样，使用DELETE CASCADE。谢谢你的帮助和建议！
case 'delete_node_with_children':

    $node = isset($_GET['id']) && $_GET['id'] !== '#' ? (int)$_GET['id'] : 0;

    $sql = "DELETE FROM {$table_name} WHERE id = :node OR parent_id = :node";

    $res = $db->prepare($sql);
    $res->execute(['node' => $node]);

    break;