如何在HTML呈現多層次的MySQL查詢（笨）

Question

這是MySQL查詢

SELECT * 
FROM users AS up 
JOIN users AS u ON up.id = u.parent_id 
JOIN users AS uc ON u.id = uc.parent_id 
WHERE up.id =16 

，這是在視圖文件

<?php foreach($query->result() as $q): ?> 
    <?php echo $q->id; ?> 

    <?php endforeach; ?> 

MySQL的結果給出了3個級別的輸出結果，但在HTML它只輸出1級，並且是最後一級，但我需要在層次結構中呈現它

Answer 1

將您的查詢更改爲：

SELECT up.id AS id1, u.id AS id2, uc.id AS id3 
FROM users AS up 
JOIN users AS u ON up.id = u.parent_id 
JOIN users AS uc ON u.id = uc.parent_id 
WHERE up.id = 16 

然後你就可以訪問三個層次爲id1，id2和id3：

<?php 
    foreach($query->result() as $q) { 
    echo $q->id1; 
    echo $q->id2; 
    echo $q->id3; 
    } 
?>