从嵌套集模型结构为Fancytree创建JSON

Question

我想用jquery插件Fancytree显示一个数据结构。在Google中进行长时间搜索之后，将数据结构存储在数据库中的最佳方法似乎是嵌套的Set模型(在这里的Stackoverflow中描述)。然而，要显示这种结构的相关嵌套JSON是相当困难的，我无法做到。

这包括转换以下MySQL表：

( category_id )\x{e76f}\x{e76f}=

\x{e76f}\x{e76f}电子产品1,000,000

\x{e76f}\x{e76f}2电视

\x{e76f}\x{e76f}管状

\x{e76f}5-等离子体-7-8-2

\x{e76f}\x{e76f}6-便携式电子产品- 10 - 19 -1

\x{e76f}\x{e76f} MP3球员

#^#^#^=#^#^#.

\x{e76f}\x{e76f} CD播放机

\x{e76f}\x{e76f}2双向无线电台

到这个JSON中：

[{"key": "1", "title": "ELECTRONICS", "expanded": true, "children": [
    {"key": "2", "title": "TELEVISION", "expanded": true, "children": [
        {"key": "3", "title": "TUBE"},
        {"key": "4", "title": "LCD"},
        {"key": "5", "title": "PLASMA"}
    ]},
    {"key": "6", "title": "PORTABLE ELECTRONICS", "expanded": true, "children": [
        {"key": "7", "title": "MP3 PLAYERS", "expanded": true, "children": [{"key": "8", "title": "FLASH"}]},
        {"key": "9", "title": "CD PLAYERS"},
        {"key": "10", "title": "2 WAY RADIOS"}
    ]}
]}]

我想知道它是否存在将MySQL数据转换为分层嵌套JSON的简单方法？谢谢!

Answer 1

最后，通过一点一点地使JSON工作，我设法使我的树工作起来。我不认为它是适当的，因为它不是由对象和数组组成的，但这似乎很好。

 <?php 
    if (!isset($DB_connection)) { require_once('../config/_db_connect.php'); } 
    $result = $DB_connection->prepare("SELECT node.category_id, node.name, 
     (COUNT(parent.name) - 1) AS depth FROM nested_category AS node,
      nested_category AS parent WHERE node.lft BETWEEN parent.lft 
      AND parent.rgt GROUP BY node.name ORDER BY node.lft;"); 
    $result->execute(); 

    $i = 0;
    $nb_open = 0;
    $current_level = '';

    echo "[{";
    while( $line = $result->fetch(PDO::FETCH_OBJ) )
    {                       
        if ($current_level == '') { $current_level = $line->depth; } 

        if ($current_level == $line->depth) { if ($i > 0) { echo " }, {"; } }
        elseif ($current_level < $line->depth) {
            echo ',  "children": [ { ';
            $nb_open = $nb_open + 1;
        }
        elseif ($current_level > $line->depth) {
            $nb_to_close = $current_level - $line->depth;
            for ($j = 1; $j <= $nb_to_close; $j++) {
                $nb_open = $nb_open - 1;
                echo " }]";
            }
            echo "}, {";
        }

        echo ' "title": "' . $line->name . '", "key": "' .
              $line->category_id . '", "expanded": true';
        $current_level = $line->depth;
        $i++;
    }

    if ($nb_open>0) { for ($i = 1; $i <= $nb_open; $i++) { echo "}]"; } }
    echo "}]";
    ?>