实现mysql树形结构查询 父路径

1. 表格展示整体流程

步骤 操作
1 获取当前节点的父节点路径
2 查询父节点路径的详细信息
3 显示父节点路径信息

2. 具体步骤及代码示例

步骤1：获取当前节点的父节点路径

SELECT CONCAT_WS('/',t2.name, t1.name) AS path
FROM category AS t1, category AS t2
WHERE t1.lft BETWEEN t2.lft AND t2.rgt
AND t1.id = 6;
  • 代码解释：
    • 通过查询左值和右值之间的节点，获取当前节点的父节点路径。

步骤2：查询父节点路径的详细信息

SELECT * 
FROM category AS t1
LEFT JOIN category AS t2 ON t1.lft BETWEEN t2.lft AND t2.rgt
WHERE t1.id = 6;
  • 代码解释：
    • 使用左连接查询，获取父节点路径的详细信息。

步骤3：显示父节点路径信息

SELECT DISTINCT CONCAT_WS('/',t2.name, t1.name) AS path
FROM category AS t1, category AS t2
WHERE t1.lft BETWEEN t2.lft AND t2.rgt
AND t1.id = 6;
  • 代码解释：
    • 查询父节点路径，并显示出来。

3. 序列图

sequenceDiagram
    participant Dev as Developer
    participant Newbie as Newbie
    
    Dev->>Newbie: 介绍mysql树形结构查询 父路径的流程
    Newbie->>Dev: 确认理解
    Dev->>Newbie: 演示具体代码操作
    Newbie->>Dev: 尝试实践

4. 状态图

stateDiagram
    [*] --> Start
    Start --> Node1
    Node1 --> Node2
    Node2 --> Node3
    Node3 --> [*]

经过以上步骤，你应该能够成功实现“mysql树形结构查询 父路径”的操作了。祝你学习顺利！