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我可以在分层数据模型中找到给定记录的所有子代(请参见下面的代码),但我不确定如何使用给定的子ID遍历父/子链。任何人都可以指出我在正确的方向弄清楚如何做到这一点?这在LINQ to SQL中可能吗?CTE可以遍历层次?
WITH TaskHierarchy (TaskID, [Subject], ParentID, HierarchyLevel, HierarchyPath) AS
(
-- Base case
SELECT
TaskID,
[Subject],
ParentID,
1 as HierarchyLevel,
CONVERT(VARCHAR(MAX),'/') AS HierarchyPath
FROM Task
WHERE TaskID = 2
UNION ALL
-- Recursive step
SELECT
t.TaskID,
t.Subject,
t.ParentID,
th.HierarchyLevel + 1 AS HierarchyLevel,
CONVERT(varchar(MAX),th.HierarchyPath + CONVERT(VARCHAR(32),t.ParentID) + '/') AS HierarchyPath
FROM Task t
INNER JOIN TaskHierarchy th ON
t.ParentID = th.TaskID
)
SELECT *
FROM TaskHierarchy
ORDER BY HierarchyLevel, [Subject]
感谢张贴您的解决方案!它节省了我几个小时! – 2009-11-29 20:35:14