Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>As for the <strong>controller->view relationship</strong> you have highlighted</p> <ul> <li>The controller needs to be able to choose the appropriate view that is displayed</li> </ul> <p>AFAIK, that is the only relationship the controller has with the view (aside for the view routing messages to the controller). MVC is a little different from MVVM/MVP because you don't necessarily have just one view for each controller. For example, you could have a user controller and you might have a view for displaying information, one for editing users, and one for adding users. With the other two methods, there is a one to one relationship between views and ViewModels or Presenters.</p> <ul> <li>Controllers being independent of the view is not a myth</li> </ul> <p>Maybe I haven't used MVC enough in other scenarios but I have always kept the controller independent of the view. In fact if you have any view code in your controller (ie function with ListBoxEventArgs, referring to view components, etc) then you have not achieved the goal of this pattern which is to separate your view from your logic and model. I believe ASP.NET MVC makes views completely independent of the controller by having some class that manage tracking the initiated views. This class is available to all the controllers (through inheritance but dependency injection is fine too) and then each controller just picks a view to display using this class. The view can be selected with a constant or a string (in fact, I believe it is even possible to select them with no argument and based on the method name).</p> <hr> <p><strong>view->controller relationship</strong></p> <p>With ASP.NET MVC, view's are independent of the controller too since events are routed to the controller via url. However. in other non-web situations, it is fine to just forward your events to the controller by directly calling controller methods in the code behind.</p> <hr> <p><strong>Implementation details</strong></p> <p>On my blog, I wrote an article that covers the implementation of MVC a bit and should help answer your questions.</p> <p><strong><a href="http://joel.inpointform.net/software-development/mvvm-vs-mvp-vs-mvc-the-differences-explained/" rel="nofollow">MVVM vs MVP vs MVC: The differences explained</a></strong></p> <p>Personally, I think the type of MVC shown in your diagram is not being employed as often today as in the past and it might be hard to find examples that use those relationships as shown. The reason is that if the view is able to talk to the model, then I think developers will opt for MVP or MVVM (and use a view model) over MVC. The only case I can think of where the view is not able to continuously talk to the model is in server client situations. In this case, there are many popular MVC frameworks like ASP.NET MVC is still popular today. </p>
    singulars
    1. This table or related slice is empty.
    1. PORelations between elements of MVC
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USi8abug
    1. USi8abug
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. COOk, was thinking about this some more. I have one example for where it is tempting to put view code in the controller - if you have a generic message box that you need to show. There is a desire to just do something like MessageBox.Show(...) in your controller. It is only a couple lines of code to just have a message box view in your view manager (view manager being the method the controller uses to choose a view).
      singulars
      1. PO
      1. USi8abug
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload