包含级别/距离列的闭包表INSERT语句 [英] Closure Table INSERT statement including the level/distance column

问题描述

我指的是 Bill Karwin的演示文稿，以实现封闭表，这将有助于我管理层次结构.不幸的是，该演示文稿并未显示我如何插入/更新幻灯片67中提到的Level列；这将是非常有用的.我一直在想一想，但我无法提出我可以测试的具体内容.这是到目前为止我得到的:

I'm referring Bill Karwin's presentation in order to implement a closure table which will help me manage hierarchies. Unfortunately, the presentation does not show how I could insert/update the Level column mentioned on slide 67; this would have been very useful. I've been giving it a thought but I couldn't come up with something concrete that I could test. Here's what I got so far:

create procedure USP_OrganizationUnitHierarchy_AddChild 
    @ParentId UNIQUEIDENTIFIER,
    @NewChildId UNIQUEIDENTIFIER
AS
BEGIN
    INSERT INTO [OrganizationUnitHierarchy]
    (
        [AncestorId],
        [DescendantId],
        [Level]
    )
    SELECT [AncestorId], @NewChildId, (here I need to get the count of ancestors that lead to the currently being selected ancestor through-out the tree)
    FROM [OrganizationUnitHierarchy]
    WHERE [DescendantId] = @ParentId
    UNION ALL SELECT @NewChildId, @NewChildId
END
go 

我不确定该怎么做.有什么想法吗?

I am not sure how I could do that. Any ideas?

推荐答案

您知道，对于Parent = self，您具有Level = 0，并且当您从祖先复制路径时，您只是将Level 1增加了.

You know that for Parent = self you have Level = 0 and when you copying paths from ancestor, you're just increasing Level by 1:

create procedure USP_OrganizationUnitHierarchy_AddChild 
    @ParentId UNIQUEIDENTIFIER,
    @NewChildId UNIQUEIDENTIFIER
AS
BEGIN
    INSERT INTO [OrganizationUnitHierarchy]
    (
        [AncestorId],
        [DescendantId],
        [Level]
    )
    SELECT [AncestorId], @NewChildId, [Level] + 1
    FROM [OrganizationUnitHierarchy]
    WHERE [DescendantId] = @ParentId
    UNION ALL
    SELECT @NewChildId, @NewChildId, 0
END

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