Help With Recursion

Mar 28, 2008

I have a table

CREATE TABLE [dbo].[chart_hiera2](
[AccessID] [int] NULL,
[ChildID] [int] NULL,
[Child] [varchar](100) NULL,
[ParentID] [int] NULL,
[CGID] [int] NULL,
[Depth] [smallint] NULL,
[Lineage] [varchar](255) NULL,
[node] [bit] NULL,
[PercentOwnership] [varchar](10) NULL,
[Notes] [varchar](80) NULL
) ON [PRIMARY]

I am trying to build the value off hierarchy that will be later inserted in the linage and Depth column. I am trying to do so using recursion . the rulles for recording the linages as as follows Lineage = parent.Lineage + Ltrim(Str(ParentID,6,0)) + '/'

here is my code below

with BuildHierarchy as (
SELECT AN.AccessID,AN.ChildID,AN.Child,AN.ParentID,AN.CGI D, 1 as Depth,AN.Lineage,AN.node,AN.PercentOwnership, AN.Notes
FROM chart_hiera2 as AN WHERE AN.Depth Is Null and AN.AccessID = @accID
union all
SELECT AN.AccessID,AN.ChildID,AN.Child,AN.ParentID,AN.CGI D,Cast(AN.Depth as smallint) +1 ,Cast(BH.Lineage+ Ltrim(Str(AN.ParentID,6,0)) + '/' as varchar(255)),AN.node,AN.PercentOwnership, AN.Notes
FROM chart_hiera2 as AN inner join BuildHierarchy BH on AN.ParentID=BH.ChildID
WHERE AN.Depth>=0 AND AN.Lineage Is Not Null AND AN.Depth Is Null and AN.AccessID = @accID)--@accID --and T.AccessID = @accID)
select * from BuildHierarchy

but it does not increment Depth or builds Lineage .What am I doing wrong?

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Do I Need Recursion ?

Jan 8, 2005

Hi there, Any tips on my problem would be most welcome...

right, the scenario.

A web Blog

blogger1 posts a blog_entry, e.g I love the simpsons
blogger2 comments on that blog_entry, e.g No, I hate the simpsons
Blogger3 comments on that comment, ie, How can you hate the simpsons.

so you can comment on a comment on a comment etc.. lool.

right, i have got two tables... Blog_entry & comment. i need to be able to search for a blog_entry + all the comments on that blog_entry..

at the moment i can search for the comments on the blog_entry using the FK in the comment table.


blog_entry
INSERT INTO Blog_Entry VALUES(0001,'I love the Simpsons');

comments
INSERT INTO Comment VALUES(0001,' No I hate the simpsons, cID 1000);

but i need to be able to search for the comments on comments

INSERT INTO Comment VALUES(0001,' How can you hate the simpsons, cID1000);

hopefully you can see the problem here, with only one comments table how can i get the search for the comment on the comment.. there’s nothing linking them...
I could make a sub comments table, and use a FK (as with the blog_entry & first comment)

but then I would have to make another sub sub table to be able to get those comments on the first sub table... this would go on and on for each comment on comment.

you can see the cID1000 (comment PK) I can't use this to get the comment because its duplicating the PK...

So, I need to be able to search for the comments on comments… eg. I need to be able to search for blogger2, and any comments that were made on his comments.


Someone I know mention using recursion to get the comment on comment info, is this right ?

Hehe, I hope you understand what im asking here… the is my first exploration of SQL, so any tips, hints, would be most welcome….

Thanks loads…

PS: if there anything you don’t understand about what I have written, or what im asking… please say so…

Spence.

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Apr 28, 2008

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And second question: here the code -



Code Snippet

;WITH dt (Id, NodeText, PId, State, RowNumber) AS
(
SELECT Id, NodeText, PId, State, ROW_NUMBER() OVER(ORDER BY Id) AS RowNumber
FROM DataTable
WHERE Id = 1

UNION ALL

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)

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Hi Y'all,I receive an error while using recursion:The maximum recursion 100 has been exhausted before statement completion. Can someone tell me where i can alter the default value?Thanks in advance

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I am not sure if select recursion is possible and thought I would throw this challenge to the dba community. The preference would be to create a view that does the work on the backend instead of writing frontend VB code.

Below is script that creates and populates a temp table along with the desired result-set.

create table #myTest
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insert into #myTest (parent,minutes) values (null,1)
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Desired resultset:

id Parent Totalminutes
----------- ----------- -------
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            Sample
                                   
                                    ParentGroup_ID            Group_ID
12                                                    8
13                                                    8
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