Learn More





DNN Community Blog

The Community Blog is a personal opinion of community members and by no means the official standpoint of DNN Corp or DNN Platform. This is a place to express personal thoughts about DNNPlatform, the community and its ecosystem. Do you have useful information that you would like to share with the DNN Community in a featured article or blog? If so, please contact .

The use of the Community Blog is covered by our Community Blog Guidelines - please read before commenting or posting.

DotNetNuke 6.2 CTP1: Page Hierarchies

DotNetNuke 6.2.0 introduces changes to how the Tab (Page) Hierarchy is managed.

Page_Hierarchies_1Due to the limitations of earlier versions of SQL Server, which we were required to support prior to DNN 5.4, the business layer had to manage the handling of the page hierarchy. Whenever a page (tab) was created or moved in the hierarchy, there was a lot of calculation to calculate the effect on other pages and update them accordingly.

In a large site like this one - if a page with a large number of descendants is updated then every descendant is updated so that its "Level" and "TabPath" can be updated in the database.

SQL Server 2005 introduced the concept of "Common Table Expressions" or CTEs, which allow you to create recursive SQL scripts with fairly decent performance. Since we now require at least SQL Server 2005 as our base version of SQL Server, we have removed the Level and TabPath columns from the Tabs table and instead calculate them "on-the-fly" in the Tabs View.

    WITH RecursiveTabs (TabID, Level, TabPath)
            0 AS Level,
            CAST('//' + dbo.dnn_RemoveStringCharacters(TabName, '&? ') AS NVARCHAR(255)) AS TabPath
        FROM dnn_Tabs
        WHERE ParentId IS Null
        UNION ALL
            Level + 1,
            CAST(TabPath + '//' + dbo.dnn_RemoveStringCharacters(TabName, '&? ') AS NVARCHAR(255))
        FROM dnn_Tabs T
        INNER JOIN RecursiveTabs R ON T.ParentId = R.TabID

This now means that we don't have to do all the manipulation in the business layer in order to manage these properties.

In addition to removing the two columns from the database table, we pushed more of the logic for creating and moving pages into more specific stored procedures e.g. MoveTabBefore, MoveTabAfter etc., which are 1:1 mappings to the API methods in TabController. A few methods in TabController that are no longer necessary have been deprecated and a few new ones created.

To give an example of the effect of these changes - consider a page with 20 child pages. To move one of those child pages (in the Page Management module) to the top triggered 166 calls to the database in 6.1.2. In 6.2.0 this move triggers 5 calls to the database, and the guts of the work is done in a single stored procedure MoveTabBefore.

For the most part this change does not affect 3rd party developers unless they are manipulating pages directly in the Tabs table in the database.  As long as you are using the API or are working with the vw_Tabs database View then everything should continue to work. However, both the performance and reliability of moving tabs is now enhanced significantly, as everything is encapsulated in a single stored procedure.


There are currently no comments, be the first to post one.

Comment Form

Only registered users may post comments.


2sic Daniel Mettler (125)
Aderson Oliveira (15)
Alec Whittington (11)
Alex Shirley (10)
Andrew Nurse (30)
Anthony Glenwright (5)
Antonio Chagoury (28)
Ash Prasad (22)
Ben Schmidt (1)
Benjamin Hermann (25)
Benoit Sarton (9)
Beth Firebaugh (12)
Bill Walker (36)
Bob Kruger (5)
Brian Dukes (2)
Brice Snow (1)
Bruce Chapman (20)
Bryan Andrews (1)
cathal connolly (55)
Charles Nurse (163)
Chris Hammond (203)
Chris Paterra (55)
Clinton Patterson (28)
Cuong Dang (21)
Daniel Bartholomew (2)
Dave Buckner (2)
David Poindexter (3)
David Rodriguez (2)
Doug Howell (11)
Erik van Ballegoij (30)
Ernst Peter Tamminga (74)
Geoff Barlow (6)
Gifford Watkins (3)
Gilles Le Pigocher (3)
Ian Robinson (7)
Israel Martinez (17)
Jan Blomquist (2)
Jan Jonas (3)
Jaspreet Bhatia (1)
Jenni Merrifield (6)
Joe Brinkman (270)
John Mitchell (1)
Jon Henning (14)
Jonathan Sheely (4)
Jordan Coopersmith (1)
Joseph Craig (2)
Kan Ma (1)
Keivan Beigi (3)
Ken Grierson (10)
Kevin Schreiner (6)
Leigh Pointer (31)
Lorraine Young (60)
Malik Khan (1)
Matthias Schlomann (15)
Mauricio Márquez (5)
Michael Doxsey (7)
Michael Tobisch (3)
Michael Washington (202)
Mike Horton (19)
Mitchel Sellers (28)
Nathan Rover (3)
Navin V Nagiah (14)
Néstor Sánchez (31)
Nik Kalyani (14)
Peter Donker (52)
Philip Beadle (135)
Philipp Becker (4)
Richard Dumas (22)
Robert J Collins (5)
Roger Selwyn (8)
Ruben Lopez (1)
Ryan Martinez (1)
Salar Golestanian (4)
Sanjay Mehrotra (9)
Scott McCulloch (1)
Scott S (11)
Scott Wilkinson (3)
Scott Willhite (97)
Sebastian Leupold (80)
Shaun Walker (237)
Shawn Mehaffie (17)
Stefan Cullmann (12)
Stefan Kamphuis (12)
Steve Fabian (31)
Timo Breumelhof (24)
Tony Henrich (3)
Torsten Weggen (2)
Vicenç Masanas (27)
Vincent Nguyen (3)
Vitaly Kozadayev (6)
Will Morgenweck (37)
Will Strohl (163)
William Severance (5)
Try Evoq
For Free
Start Free Trial
a Demo
See Evoq Live
Need More Information?