如何按groupmenu对数据进行排序？

Question

如何按groupmenu对数据进行排序？

mysql

SELECT pc.pc_id, pc.pc_icon, pc.pc_parent, pcd.pcd_name, pcd.pcd_id 
FROM product_category pc 
LEFT JOIN product_category_detail pcd ON pcd.pc_id=pc.pc_id 
ORDER BY pc.pc_group, pc.pc_sort, pc.pc_id

我想显示内容菜单

实施例

• TEST6
• -subtest6
• - subtest6-2
• --- subtest6-2-1
• TEST7

我如何查询？ 谢谢

Answer 1

如果您想拥有无限的子菜单，可能更容易使用PHP循环。

生成2级菜单仍然很容易，例如

SELECT a.id,
FROM 
SELECT pc.pc_id, pc.pc_icon, pc.pc_parent, pcd.pcd_id,
concat(if (pc.pc_parent = 0, '', '- '), pcd.pcd_name) AS pcd_name
FROM product_category AS pc
LEFT JOIN product_category_detail AS pcd ON pcd.pc_id = pc.pc_id

ORDER BY pc.pc_group，pc.pc_sort，pc.pc_id

或者您可以重新设计类别表，以获得简单且无限制的子菜单树：

pc_id
11
1122   -- kid of 11
112233 -- kid of 1122
55
66
6677   -- kid of 66