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  • What are the Options for Storing Hierarchical Data in a Relational Database?

    - by orangepips
    Good Overviews One more Nested Intervals vs. Adjacency List comparison: the best comparison of Adjacency List, Materialized Path, Nested Set and Nested Interval I've found. Models for hierarchical data: slides with good explanations of tradeoffs and example usage Representing hierarchies in MySQL: very good overview of Nested Set in particular Hierarchical data in RDBMSs: most comprehensive and well organized set of links I've seen, but not much in the way on explanation Options Ones I am aware of and general features: Adjacency List: Columns: ID, ParentID Easy to implement. Cheap node moves, inserts, and deletes. Expensive to find level (can store as a computed column), ancestry & descendants (Bridge Hierarchy combined with level column can solve), path (Lineage Column can solve). Use Common Table Expressions in those databases that support them to traverse. Nested Set (a.k.a Modified Preorder Tree Traversal) First described by Joe Celko - covered in depth in his book Trees and Hierarchies in SQL for Smarties Columns: Left, Right Cheap level, ancestry, descendants Compared to Adjacency List, moves, inserts, deletes more expensive. Requires a specific sort order (e.g. created). So sorting all descendants in a different order requires additional work. Nested Intervals Combination of Nested Sets and Materialized Path where left/right columns are floating point decimals instead of integers and encode the path information. Bridge Table (a.k.a. Closure Table: some good ideas about how to use triggers for maintaining this approach) Columns: ancestor, descendant Stands apart from table it describes. Can include some nodes in more than one hierarchy. Cheap ancestry and descendants (albeit not in what order) For complete knowledge of a hierarchy needs to be combined with another option. Flat Table A modification of the Adjacency List that adds a Level and Rank (e.g. ordering) column to each record. Expensive move and delete Cheap ancestry and descendants Good Use: threaded discussion - forums / blog comments Lineage Column (a.k.a. Materialized Path, Path Enumeration) Column: lineage (e.g. /parent/child/grandchild/etc...) Limit to how deep the hierarchy can be. Descendants cheap (e.g. LEFT(lineage, #) = '/enumerated/path') Ancestry tricky (database specific queries) Database Specific Notes MySQL Use session variables for Adjacency List Oracle Use CONNECT BY to traverse Adjacency Lists PostgreSQL ltree datatype for Materialized Path SQL Server General summary 2008 offers HierarchyId data type appears to help with Lineage Column approach and expand the depth that can be represented.

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  • Please Help me to create a replace function in vb.net

    - by Rajesh Rolen- DotNet Developer
    Please Help me in creating a replace function. Problem: Their is a alfanumeric value of any lenght (string) and i want to replace its all characters with 'X' except right four characters Like : Value : 4111111111111111 Result Should be: XXXXXXXXXXXX1111 I have created a function but got stuck: public function myfunction(str as string) str.Replace(str.Substring(0, str.Length - 5), 'X') 'but here i want no of x to be equvals to count of lenght of str - 4 end function please tell me a better fuction to perform such a operation

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  • How to extend models of other applications in Django?

    - by culebrón
    I have a small app with Category model and want to make a required foreign key referencing it from Photologue Gallery model. What's the right approach? I can make many-to-many field in Category, but this way it will not be required in Gallery. Use "register" and modify the Gallery model? Inherit it in my app?

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  • Using Frameset with Treeviews in ASP.Net

    - by Ben
    Afternoon, I am trying have an HTML file containing a frameset which contains two frames. I have populated the left Frame with a URL containing a TreeView with URL's for the nodes. I would like the to be able to select a URL from the treeview in the left hand frame, and have it set the src of the right hand frame to be that URL. Is that possible? Thanks

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  • How to add Ajax validation in a master where I have fields for other tables based on jqrelcopy?

    - by AravindRaj
    In a master page(_form) I want to save three fields drop down text box Option list and if a certain option from the option list is selected I need a JQrelcopy to appear and the user can add many values using JQrelcopy. The values, which are stored in JQrelcopy has to be saved in some other table. Now the problem is I want to give AJAX validation like the field cannot be blank, Only alphabetical characters are allowed for the fields which are inserted through JQrelcopy. I thought about creating a scenario, but I can't get it right

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  • Is there an easy way to make a horizontally paged UIScrollView wrap around?

    - by rustyshelf
    I notice that in the stocks application, the small graph wraps around, eg: when you get to the end of the scroll view and swipe right again, you go back to the beginning. Before I go ahead and code this myself is there an easy way to do this in the SDK? I can't find any properties or methods that would enable that? I have a paged UIScrollView that scrolls horizontally, pretty much exactly like the stocks application one does.

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  • How to add a context processor from a Django app

    - by Edan Maor
    Say I'm writing a Django app, and all the templates in the app require a certain variable. The "classic" way to deal with this, afaik, is to write a context processor and add it to TEMPLATE_CONTEXT_PROCESSORS in the settings.py. My question is, is this the right way to do it, considering that apps are supposed to be "independent" from the actual project using them? In other words, when deploying that app to a new project, is there any way to avoid the project having to explicitly mess around with its settings?

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  • How to insert date in sqlite through java.

    - by dimitar
    Hello guys, I want to make a database that will hold a date in it(SQLite). Now first to ask is what is the right syntax to declare a date column. The second i want to know is how to insert date in it after that. And the third thing i want to know is how to select dates between, for example to select all rows which contain date between 01/05/2010 and 05/06/2010. Thank you

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  • Java wysiwyg HTML Editor

    - by Kyle
    Hello, I'm working on a project and need a simple free java HTML wysiwyg editor can anyone point me in the right direction?. It only has a small space to fit into, so something fairly simple would be best. Thanks for the help!

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  • CSS three column layout, liquid center, no left-margin!

    - by moontear
    Hi, I am all in favor of CSS based layouts, but this one I just can't figure out. With a table it is oh-so-easy: <html> <head><title>Three Column</title></head> <body> <p>Test</p> <table style="width: 100%; border: 1px solid black; min-height: 300px;"> <tr> <td style="border: 1px solid green;" colspan="3">Header</td> </tr> <tr> <td style="border: 1px solid green; width: 150px;" rowspan="2">Left</td> <td style="border: 1px solid yellow;">Content</td> <td style="border: 1px solid blue; width: 200px;" rowspan="2">Right</td> </tr> <tr> <td style="border: 1px solid fuchsia;">Additional stuff</td> </tr> <tr><td style="border: 1px solid green;" colspan="3">Footer</td></tr> </body> <html> Left is fixed width Right is fixed width Content is liquid Additional stuff sits beneath content Now here is the important part: "Left" may not exist. Again this is easy with the table. Delete the column and "Content" expands. Beautiful. I have looked through many examples (and "holy grails") of liquid and table less three-column CSS based layouts, but I have not found one which is not using some kind of margin-left for the middle column ("Content"). Any margin-left will suck once "Left" is gone as "Content" will just stay at it's place. I'm just about to switch to old school table based layout for this problem, so I'm hoping someone has some idea - I don't care about excess markup, wrappers and the like, I would just like to know how to solve this with plain CSS. Btw: look at how easy equal height columns are... Cheers PS: No CSS3 please

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  • visual studio recognizing .asp properly or suggestion for classic asp editor/iDE

    - by Neil Warner
    How do I get visual studio 2005 to work best with .asp files? I used to have this on my old PC but I can't get the settings right. I exported and important all my old settings and still no dice. alternatively I think there might be an even better choice for classic asp IDE editor. It'd be nice to have intellisense, completion, highlighting, stuff like that for ASP (vbscript) and css/html at the same time. (I'm happy not to type out css selectors) thanks

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  • Internet Explorer border bug

    - by Skilldrick
    On this page in Internet Explorer 6 and 7 on XP and Vista there is a bug where scrolling the page seems to lose bits of the left and right borders. Has anyone seen this behaviour before, and does anyone have any ideas to avoid it?

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  • How can I add multiple pre-commit SVN Hooks

    - by Alister Bulman
    I've got several pre-commit hooks that I would like to run before each commit. Right now, they are all just shell-scripts, so I know i could just concatenate them to get them all to run. In the future though, additional scripts may be written in Perl, PHP, or some other language as well. How can I run several different scripts as part of a single pre-commit hook?

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  • How to best structure a website in Liferay Portal

    - by user326072
    Hi, I am working on a project involving Liferay Portal and I was hoping to get some input on how to properly utilize community and organizations in the site structure. I have so far been frustrated with the lack of documentation on this subject, and Liferay's internal forum seems to be all but dead. Can someone point me in the right direction here? Thanks.

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  • sftp for .net c#

    - by d daly
    Hi my boss has asked me to come up with a test page which can handle sftp of a file from one internal server to another. As Ive never done this before I was wondering if anyone could give me a shove in the right direction please? thanks DD

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  • Haskell Type error

    - by Jon
    I am getting a Couldn't match expected type error on this code and am not sure why. Would appreciate it if someone could point me in the right direction as to fixing it. import qualified Data.ByteString.Lazy as S import Data.Binary.Get import Data.Word getBinary :: Get Word16 getBinary = do a <- getWord16be "Test.class" return (a) main :: IO () main = do contents <- S.getContents print getBinary contents Specifically it cannot match expected type 'S.ByteString - IO ()' to inferred type 'IO ()'

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  • mozilla browser hot keys? [closed]

    - by Roger22
    Hello, Where can i find the key combinations for some actions, in Mozilla Firefox? For example, Ctrl+L moves the cursor to the address bar. I wanna move the cursor in the Google search box, from the right-top position). Which key is associated with this? And some other key combinations? Thanks!

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  • How to display an array's content in colomns, like ls -C does.

    - by Arko
    I wanted to display a long list of strings from an array. Right now, my script run through a for loop echoing each value to the standard output: for value in ${values[@]} do echo $value done Yeah, that's pretty ugly! And the one column listing is pretty long too... I was wondering if i can find a command or builtin helping me to display all those values in columns, like the ls command does by default when listing a directory (ls -C).

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