6

我对菜单的 hierarchyID 和 UserRights 有问题。例如，我只想给用户 4 级的权利，我的查询应该自动从 4 级子级中选择所有父级。这个怎么做 ？

你明白我的问题吗？我只是想要一个孩子的所有父母（祖先）。

问候曼努埃尔

4

4 回答 4

4

最近我一直在使用 HierarchyId 进行很多工作，我遇到了这个问题，以寻找不同问题的答案。我想我会把这个例子混在一起，因为它说明了一些事情。首先，您可以在没有递归 CTE 的情况下获得条件表达式。其次，GetDescendantOf 是包容性的，因此您不需要检查t1.NodeId = t2.NodeId（我通常更喜欢连接而不是子查询）。这是您可以玩的完整演示：

BEGIN TRANSACTION

CREATE TABLE #HierarchyDemo
(
    NodeId HIERARCHYID PRIMARY KEY NOT NULL,
    Description AS NodeId.ToString(),
    Depth AS NodeId.GetLevel()
)

INSERT INTO #HierarchyDemo VALUES ( HierarchyId::GetRoot() );
INSERT INTO #HierarchyDemo VALUES ( CAST ('/1979/' AS HIERARCHYID) );
INSERT INTO #HierarchyDemo VALUES ( CAST ('/2012/' AS HIERARCHYID) );
INSERT INTO #HierarchyDemo VALUES ( CAST ('/2012/2/' AS HIERARCHYID) );
INSERT INTO #HierarchyDemo VALUES ( CAST ('/1979/4/' AS HIERARCHYID) );
INSERT INTO #HierarchyDemo VALUES ( CAST ('/2012/2/17/' AS HIERARCHYID) );
INSERT INTO #HierarchyDemo VALUES ( CAST ('/1979/4/6/' AS HIERARCHYID) );

SELECT *
FROM #HierarchyDemo;

SELECT *
FROM #HierarchyDemo startingPoint
INNER JOIN #HierarchyDemo parent
    ON startingPoint.NodeId.IsDescendantOf(parent.NodeId) = 1
WHERE startingPoint.Description = '/2012/2/17/'

ROLLBACK TRANSACTION
于 2013-03-19T20:01:51.117 回答
3

这样的事情避免了CTE

SELECT t1.NodeId.ToString(), t1.Name
    FROM (SELECT * FROM test_table2
        WHERE Name = 'Node 1.1.1') t2
    , test_table2 t1
    WHERE
        t1.NodeId = t2.NodeId OR
        t2.NodeId.IsDescendantOf(t1.NodeId) = 1
于 2011-08-03T15:26:56.207 回答
1

假设您有这张桌子：

CREATE TABLE Hierarchy
(
    CompanyNode hierarchyid NOT NULL,
    CompanyId int NOT NULL,
    NodeLevel AS CompanyNode.GetLevel()
    CONSTRAINT PK_Hierarchy PRIMARY KEY NONCLUSTERED (CompanyNode)
)

然后你填充它，让它保存这些数据：

CompanyNode CompanyId NodeLevel
0x  1   0
0x58    2   1
0x5AC0  3   2
0x68    100 1
0x6AC0  101 2
0x6AD6  1000    3
0x6AD6B0    10000   4
0x78    20  1
0x7AC0  200 2
0x7AD6  2000    3
0x7AD6B0    20000   4
0x7AD6B580  200000  5
0x7AD6D0    20001   4
0x7ADA  2001    3
0x7ADE  2002    3
0x7B40  201 2
0x7BC0  202 2

现在你想得到 CompanyId 20001 的所有父母，我就是这样做的：

DECLARE @currentLevel smallint

SELECT  @currentLevel = NodeLevel
FROM    Hierarchy
WHERE   CompanyId = 20001;

with tree([Path], [PathName], CompanyId, [Level])
AS
(
SELECT  h.CompanyNode AS [Path],
        h.CompanyNode.ToString() AS [PathName],
        h.CompanyId,
        @currentLevel AS [Level]
FROM    Hierarchy h
WHERE   h.CompanyId = 20001

UNION ALL

SELECT  h.CompanyNode AS [Path],
        h.CompanyNode.ToString() AS [PathName],
        h.CompanyId,
        CAST((t.[Level] - 1) AS smallint) AS [Level]
FROM    Hierarchy h
        INNER JOIN tree t ON
            t.[Path].GetAncestor(1) = h.CompanyNode
    WHERE   h.[NodeLevel] > 0
)   
SELECT * FROM TREE
order by [Path]

您可以更改 CTE 的递归部分，而不过滤树的最顶层节点。

希望这可以帮助，

奥德

于 2011-04-27T07:07:08.040 回答
0 
Declare @hid hierarchyid=0x5D10 -- Child hierarchy id

SELECT
*
FROM 
  dbo.TableName
WHERE 
  @hid.IsDescendantOf(ParentHierarchyId) = 1
于 2014-01-22T07:24:49.977 回答