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PON-tiered Parent/Child Breadcrumb Trail - Bottom to Top Loop
 

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    <p>I am trying to building a breadcrumb trail based on a parent/child relationship in a SQL database table. I have done these in the past, but what I need to do now is walk my way up through the hierarchy from the bottom up (backwards).</p> <p>Here is what my DataTable looks like:</p> <p><strong>DocID</strong> | <strong>ParentDocID</strong> | <strong>Name</strong><br /> 7 | 0 | Images (Root)<br /> 24 | 7 | JPG (Level 2)<br /> 34 | 24 | Size (Level 3)<br /></p> <p>So this is an N-tiered architecture. I always know what level I am at via a query string variable. I need to loop from the bottom up so that a user can bookmark what level in the tier structure they are at. I am having trouble figuring this out. I cannot use session or viewstate.</p> <p><strong>Desired Results:</strong></p> <p>User goes to this link: Default.aspx?DocId=34 – Then they see the breadcrumb trail as such:<br /> <strong>Home</strong> > <strong>Images</strong> > <strong>JPG</strong> > <em>Size</em></p> <p>Default.aspx?DocId=24 – Then they see the breadcrumb trail as such:<br /> <strong>Home</strong> > <strong>Images</strong> > <em>JPG</em> </p> <p>The “Home” element I have hard-coded. I also need each item in the trail to link except for the level you are on.</p> <p>I would rather this be done in C# code. I also am open to SQL level Stored Procedure options.</p> <p>Any help would be greatly appreciated. Thank-you in advance!</p> <p>Here is some SQL I am trying but not getting the results I need. I hope this helps:</p> <pre><code>WITH Hierachy([DocID], [ParentDocID], [Name], [Level] AS ( SELECT [DocID], [ParentDocID], [Name], 0 AS [Level] FROM [Documents] d WHERE (d.[ParentDocID] = 7) AND ([Folder] = 1) AND ([Status] = 'A') AND ([AppGroupID] = 4) UNION ALL SELECT d.[DocID], d.[ParentDocID], d.[Name], dh.[Level] + 1 FROM [Documents] d INNER JOIN Hierachy dh --ON d.ParentDocID = dh.DocID ON dh.[ParentDocID] = d.[DocID] -- bottom up apporach WHERE ([Folder] = 1) AND ([Status] = 'A') AND ([AppGroupID] = 4) ) SELECT [DocID], [ParentDocID], [Name] FROM Hierachy --WHERE [Level] &gt; 0 </code></pre> <p>I got it! Here is the SQL that works:</p> <pre><code>WITH Hierachy([DocID], [ParentDocID], [Name], [Level]) AS ( SELECT [DocID], [ParentDocID], [Name], 0 AS [Level] FROM [Documents] d WHERE (d.[DocID] = @ParentDocID) AND ([Folder] = 1) AND ([Status] = 'A') AND ([AppGroupID] = @AppGroupID) UNION ALL SELECT d.[DocID], d.[ParentDocID], d.[Name], dh.[Level] + 1 FROM [Documents] d INNER JOIN Hierachy dh ON dh.[ParentDocID] = d.[DocID] WHERE ([Folder] = 1) AND ([Status] = 'A') AND ([AppGroupID] = @AppGroupID) ) SELECT [DocID], [ParentDocID], [Name] FROM Hierachy ORDER BY [Level] DESC ) </code></pre>
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    1. CO"I would rather this be done in C# code" - so you want to repeat SQL queries all the time, or make one fetch and then analyze?
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    2. COWhatever is the best method? I am just not sure which would be more efficient.
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    3. COStore procedure option is the most efficient, as it is done inside the DBMS...
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