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  • Would a model like this translate well to a document or graph database?

    - by Eric
    I'm trying to understand what types of models that I have traditionally persisted relationally would translate well to some kind of NoSQL database. Suppose I have a model with the following relationships: Product 1-----0..N Order Customer 1-----0..N Order And suppose I need to frequently query things like All Orders, All Products, All Customers, All Orders for Given Customer, All Orders for Given Product. My feeling is that this kind of model would not denormalize cleanly - If I had Product and Customer documents with embedded Orders, both documents would have duplicate orders. So I think I'd need separate documents for all three entities. Does a characteristic like this typically indicate that a document database is not well suited for a given model? Generally speaking, would a document database perform as well as a relational database in this kind of situation? I know very little about graph databases, but I understand that a graph database handles relationships more performantly than a document database - would a graph database be suited for this kind of model?

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  • Rails - 1 entry in model per field, per day

    - by Elliot
    Lets say I have a food model in the model, every day, people enter how many lbs of pizza/vegetables/fruit they eat. each food is its own column my issue is, I'd like it so they can only enter that in once (for that food type) every 24 hours (based on created_at). This possible?

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  • Flex-Mate, How To Back PopUp (Dialog) With A Model

    - by davidemm
    I'm using MATE on an Adobe Flex project for MVC. On one of our pages, we have a dialog window that is presented to the user that displays them information that comes from RPC. The pages where this dialog pops up is unrelated to the data being displayed so this is a separate model. How do I create a MATE mapping file that will create the dialog window, make it visible to the user, and then inject in data from a model? Thanks for reading.

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  • What are the algorithms that are used for working with large data in popular web applications

    - by Moss Farmer
    I am looking for some well known algorithms that can be considered while handling very large amount of data.(Edit- By large amount of data I refer to records in a database excluding blobs). These algorithms if not in totality but in parts may be used in big web applications like Twitter, Last.fm , Amazon ,etc. Specifically, I'm looking for names or links to such algorithms. My primary interest lies in developing a very deep understanding on working with large database records and writing efficient code for working with the same.

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  • Drawing of a huge model - How to regain performance?

    - by marc wellman
    I have a huge model I want to draw in my XNA application but because of its size I am experiencing a tremendous loss of performance. The model has about ~50 000 000 edges and has a size on disk of 205 MB in DirectX Format. Please don't ask whether this model has to be that big - yes it has! Is there a way to transfer the model directly to my GPU in order to let the GPU do the drawing like when transferring a VertexBuffer like this: graphicsDevice.Vertices[1].SetSource(_instanceBuffers[i], 0, _sizeofMatrix); because when I try to fill a vertexBuffer with all the vertices I am getting a OutOfMemoryException.

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  • Cover flow model screen adjust in iphone

    - by abdulsamad
    Hi All, Below is the link for making the cover flow model in iphone. This is a sample tutorial. http://www.chaosinmotion.com/flowcover.m Can any one tell me how can i make the cover flow model to adjust some where up on the screen. Currently it is in the centre of the screen i want if about 70 to 80pixels to move up in the screen. Your help will be highly appreciated.

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  • Is it possible to use ASP.NET Dynamic Data and SubSonic 3?

    - by James
    Is it possible to use ASP.NET Dynamic Data with SubSonic 3 in-place of Linq to SQL classes or the Entity Framework? MetaModel.RegisterContext() throws an exception if you use the context class that SubSonic generates. I thought I remembered coming across a SubSonic/Dynamic Data example back before SubSonic 3 was released but I can't find it now. Has anyone been able to get this to work?

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  • Calling data from different model in Rails

    - by Danny McClelland
    Hi Everyone, I need to be able to call data from a different model - not just one field, but any of them. At the moment I have the following models: kase person company party I can call information from the company to the kase and from the person to the kase using this: <li>Client Company Address: <span class="address"><%=h @kase.company.companyaddress %></span></li> <li>Case Handler: <span><%=h @kase.person.personname %></span></li> Those two work, however if I add the following: <li>Client Company Fax: <span><%=h @kase.company.companyfax %></span></li> <li>Case Handler Tel: <span><%=h @kase.person.personmobile %></span></li> <li>Case Handler Email: <span><%=h @kase.person.personemail %></span></li> Any idea whats wrong? Thanks, Danny EDIT: I get the following error message: NoMethodError in Kases#show Showing app/views/kases/show.html.erb where line #37 raised: You have a nil object when you didn't expect it! The error occurred while evaluating nil.personname The lines that are noted are as follows: 34: <div id="clientinfo_showhide" style="display:none"> 35: <li>Client Company Address: <span class="address"><%=h @kase.company.companyaddress %></span></li> 36: <li>Client Company Fax: <span><%=h @kase.company.companyfax %></span></li> 37: <li>Case Handler: <span><%=h @kase.person.personname %></span></li> 38: <li>Case Handler Tel: <span><%=h @kase.person.personmobile %></span></li> 39: <li>Case Handler Email: <span><%=h @kase.person.personemail %></span></li> 40: </div> The model for the kase is as follows: class Kase belongs_to :company # foreign key: company_id belongs_to :person # foreign key in join table The model for the person is as follows: class Person has_many :kases # foreign key in join table belongs_to :company The model for the company is as follows: class Company has_many :kases has_many :people def to_s; companyname; end Hope this helps!

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  • What the best way to wire up Entity Framework database context (model) to ViewModel in MVVM WPF?

    - by hal9k2
    As in the question above: What the best way to wire up Entity Framework database model (context) to viewModel in MVVM (WPF)? I am learning MVVM pattern in WPF, alot of examples shows how to implement model to viewModel, but models in that examples are just simple classes, I want to use MVVM together with entity framework model (base first approach). Whats the best way to wire model to viewModel. Thanks for answers. //ctor of ViewModel public ViewModel() { db = new PackageShipmentDBEntities(); // Entity Framework generated class ListaZBazy = new ObservableCollection<Pack>(db.Packs.Where(w => w.IsSent == false)); } This is my usual ctor of ViewModel, think there is a better way, I was reading about repository pattern, not sure if I can adapt this to WPF MVVM

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  • Master Data Management Update

    Oracle's Master Data Management suite has seen remarkable development progress in the past year and a half. Leveraging out-of-the-box integration to applications provided by Application Integration Architecture, the cost, risk and time it takes to implement an MDM solution has been cut in half. Oracle Applications are now 'MDM Aware', Data Quality tools have reached state-of-the-art status, and new hubs are coming on line. In this AppsCast, Pascal Laik, VP MDM Products discusses this progress, what it means for Oracle customers, and where we are going from here.

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  • How do I pass a string or data object between two view controllers?

    - by Jonathan
    In my last question i asked how to best send a string from one view controller to another, both which were on a navigation stack: http://stackoverflow.com/questions/2898860/pass-string-from-tableviewcontroller-to-viewcontroller-in-navigation-stack However I just realised I can either pass the path to the file in the app's document's folder as the first (the table view) has already accessed the data in the file should I pass viewcontroller the data to the pushed VC?

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  • display one-to-many relationship for a model in Django admin (list mode)

    - by theactiveactor
    In Django admin site, when listing all the objects for a given model, I know we can customize which columns get displayed for a ModelA via list_display Say that ModelA has a one-to-many relationship with ModelB. I would like to add another column on the listing page for ModelA, where each entry is a URL pointing to all objects of ModelB having a foreign key relationship on corresponding instance of Model A in that row. How can I achieve this customization with the admin app?

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  • Extending the User model with custom fields in Django

    - by Gaurav
    I am trying to extend the User model so that I can add my own custom fields but I keep getting an error stating: 'NoneType' object has no attribute '_default_manager' whenever I try to use user.get_profile() to add values to the custom field i.e. whenever I use it like so: user = User.objects.create_user(username, email, password) user.first_name = fname user.last_name = lname user.save() uinfo = user.get_profile() uinfo.timezone = "Asia/Pune" uinfo.save() I have already followed the steps given at http://stackoverflow.com/questions/44109/extending-the-user-model-with-custom-fields-in-django/965883#965883 with no luck.

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  • Why is my model's scale changing after rotating it?

    - by justnS
    I have just started a simple flight simulator and have implemented Roll and pitch. In the beginning, testing went very well; however, after about 15-20 seconds of constantly moving the thumbsticks in a random or circular motion, my model's scale begins to grow. At first I thought the model was moving closer to the camera, but i set break points when it was happening and can confirm the translation of my orientation matrix remains 0,0,0. Is this a result of Gimbal Lock? Does anyone see an obvious error in my code below? public override void Draw( Matrix view, Matrix projection ) { Matrix[] transforms = new Matrix[Model.Bones.Count]; Model.CopyAbsoluteBoneTransformsTo( transforms ); Matrix translateMatrix = Matrix.Identity * Matrix.CreateFromAxisAngle( _orientation.Right, MathHelper.ToRadians( pitch ) ) * Matrix.CreateFromAxisAngle( _orientation.Down, MathHelper.ToRadians( roll ) ); _orientation *= translateMatrix; foreach ( ModelMesh mesh in Model.Meshes ) { foreach ( BasicEffect effect in mesh.Effects ) { effect.World = _orientation * transforms[mesh.ParentBone.Index]; effect.View = view; effect.Projection = projection; effect.EnableDefaultLighting(); } mesh.Draw(); } } public void Update( GamePadState gpState ) { roll = 5 * gpState.ThumbSticks.Left.X; pitch = 5 * gpState.ThumbSticks.Left.Y; }

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  • Using SOUNDEX and DIFFERENCE to Standardize Data in SQL Server

    My client wants to standardize address information for existing and future addresses collected for their customers, particularly the street suffixes. The application used to enter and collect address information has the street suffix separated from the address field, but it is a textbox instead of a drop down list therefore things are not standardized. I know there are some options out there to standarize data, but they would like a less expensive alternative. Are there any functions in SQL Server that I can use to standardized data?

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  • Long Term Data Storage - Choosing A Media Type

    Choosing a long term data storage medium isn';t as easy as you may think. You might imagine that the data could be burnt to CD, locked in a cupboard and that it would last forever however unfortunatel... [Author: Chris Holgate - Computers and Internet - April 02, 2010]

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  • Loading data in constructors and not in constructors [JAVA]

    - by Richeve S. Bebedor
    i just want to know the difference between loading the data inside the constructor and loading the data outside the constructor but not inside any methods example: Loading inside constructor public class Model{ Object testobject; public Model(){ testobject=new Object(); } } VS example: Loading outside constructor public class Model{ Object testobject=new Object(); public Model(){ } }

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