Question

我有一个树结构表，我需要找到一个元素的完整路径，但同时，元素受权限限制

我有一张表tblMapping

map_id  name     parent_id
1       Root     0
2       Child 1  1
3       Child 2  1
4       Child 3  3
5       Child 4  4
6       Child 5  5

和tblPerms表：

perm_id map_id
1       5
2       6

我正在使用以下CTE查询：

;WITH Hierarchy (map_id, name, parent_id, Path)
AS
(
    SELECT 
        t.map_id, t.name, t.parent_id, 
        CAST(t.name AS varchar(max)) 
    FROM 
        tblMapping t
    LEFT OUTER JOIN 
        tblMapping t1 ON t1.map_id = t.parent_id 
    LEFT OUTER JOIN 
        tblPerms t2 ON t2.map_id = t1.map_id
    WHERE 
        t1.map_id IS NULL

    UNION ALL

    SELECT 
        t.map_id, t.name,t.parent_id, 
        CAST(h.Path + '.' + t.name AS varchar(max)) 
    FROM 
        Hierarchy h
    INNER JOIN 
        tblMapping t ON t.parent_id = h.map_id
)
SELECT Path
FROM Hierarchy
WHERE Path is not null
OPTION (MAXRECURSION 0)

CTE查询将为我提供与Child 4.Child 5

类似的路径

我希望能够获得元素的完整路径，即使未设置权限：Root.Child 1.Child 3.Child 4.Child 5

有关如何解决此请求的任何想法？

谢谢！

Answer 1

首先构建路径然后检查权限

WITH Hierarchy (map_id, name, parent_id, Path)
AS
(
    SELECT 
        t.map_id, t.name, t.parent_id, 
        CAST(t.name AS varchar(max))
    FROM 
        tblMapping t
    LEFT OUTER JOIN 
        tblMapping t1 ON t1.map_id = t.parent_id 
    WHERE 
        t1.map_id IS NULL

    UNION ALL

    SELECT 
        t.map_id, t.name,t.parent_id, 
        CAST(h.Path + '.' + t.name AS varchar(max))
    FROM 
        Hierarchy h
    INNER JOIN 
        tblMapping t ON t.parent_id = h.map_id

)
SELECT Path
FROM Hierarchy h
JOIN tblPerms t2 ON t2.map_id = h.map_id
WHERE Path is not null
OPTION (MAXRECURSION 0);

SQL查询从节点

1 个答案: