数据库 - 多级分类如何遍历

Question

现有一张表
表结构
Id,name,description,parent_id
一个分类下有多个子分类，每个子分类下又会有子分类，深度多达10层左右。
分类的排列也是不规则的，现在希望获得的结果如下：
水果

• 国产水果
  
  
  • 北方地区
    
    
    • 辽宁
    • 山东
      ....
  • 南方地区
    
    
    • 湖南
      ....
• 进口水果
  ....
• 精品礼盒
  ....

...

Answer 1

It is best not to use recursive methods for this kind of infinite classification

There is a relatively efficient solution (lvalue-rvalue solution) for classification information that changes little in the tree itself:
http://ftp.nchu.edu.tw/MySQL/tech-resources/articles/hierarchical- data.html

Answer 2

@Huijiewei is right. The conventional method is lvalue and rvalue. This is relatively easy to use. http://www.arkulo.com/2015/02/25/Hierarchical/ This is the Chinese article about this method. An article by , I hope it will be helpful to you~~