获取树中任何节点的 mysql 中 parent/child 关系的完整树，所有 parents

Question

示例数据：

+----+-------+----------+
| org_id | Name  | ParentID |
+----+-------+----------+
|  1 | Org1  | 2        |
|  2 | Org2  | NULL     |
|  3 | Org3  | 5        |
|  5 | Org5  | 1        |
| 14 | Org14 | 1        |
+----+-------+----------+

如果我以 org_id 1 (Org1) 用户身份登录。我想检索该用户的完整树。

我有以下递归查询：

WITH RECURSIVE cte (org_id, name, parent_id) AS (
     SELECT org_id, name, parent_id
     FROM organization
     WHERE org_id = 1
     UNION ALL
     SELECT t1.org_id, t1.name, t1.parent_id
     FROM organization t1
     INNER JOIN cte t2 ON t1.parent_id = t2.org_id
)
SELECT * FROM cte;

但是，此查询仅提供了当前 ID（本例中为 Org1）的 children。如何将所有 parents 也包含在结果集中，以便准确地重建整个树？

编辑：我使用的是 MariaDB 版本 10.4.10

编辑：我尝试了下面答案中的查询，但出现语法错误：

Answer 1

您的 CTE 获得了 children。为什么不使用另一个去相反的方向并获得 parents:

MySQL:

(WITH RECURSIVE cte (id, name, parent_id) AS (
     SELECT id, name, parent_id
     FROM organization
     WHERE id = 1
     UNION  
     SELECT t1.id, t1.name, t1.parent_id
     FROM organization t1
       INNER JOIN cte t2 ON t1.parent_id = t2.id 
)
SELECT * FROM cte)
UNION
(WITH RECURSIVE cte (id, name, parent_id) AS (
     SELECT id, name, parent_id
     FROM organization
     WHERE id = 1
     UNION 
     SELECT t1.id, t1.name, t1.parent_id
     FROM organization t1
       INNER JOIN cte t2 ON t2.parent_id = t1.id 
)
SELECT * FROM cte)

以及在 MySQL 和 MariaDB 中都有效的版本：

MySQL/MariaDB:

WITH RECURSIVE cte (id, name, parent_id, dir) AS (
     SELECT id, name, parent_id, cast(null as char(10)) as dir
     FROM organization
     WHERE id = 1
     UNION  
     SELECT t1.id, t1.name, t1.parent_id, ifnull(t2.dir, 'down')
     FROM organization t1
       INNER JOIN cte t2 ON t1.parent_id = t2.id and ifnull(t2.dir, 'down')='down'
     UNION
     SELECT t1.id, t1.name, t1.parent_id, ifnull(t2.dir, 'up')
     FROM organization t1
       INNER JOIN cte t2 ON t2.parent_id = t1.id and ifnull(t2.dir, 'up')='up'
)
SELECT id, name, parent_id FROM cte;

见db-fiddle and dbfiddle

获取树中任何节点的 mysql 中 parent/child 关系的完整树，所有 parents

Get full tree of parent/child relationships in mysql of any node in the tree with all parents

sql

tree

recursion

mariadb

mariadb-10.3