I am new to CoreData and am struggling to work out the correct way to model a particular relationship. I have an entity called \'Friend\' with a few attributes such as \'name\', \'age\', \'sex\' etc.
In ruby on rails we can specify many Database relations line belongs_to, has开发者_如何学运维_many, and this make coding a lot simpler.
Thank u a lot for your answers beforehand. I need to make a such thing I have a tablefriendship (id,user_id,friend_id,status,timestamp)
I am writing an asp.net mvc application to learn Entity Framework with and am running into an issue that I do not know how to handle.For simplicity lets take开发者_StackOverflow the following table st
After a long thought we found that the best approach for our needs would be to use multiple tables as if it was classes, so w开发者_Python百科e have something like:
I am looking for nosql key value stores that also provide for storing/maintaining relationships between stored entities. I know Google App Engine\'s datastore allows for owned and unowned relationship
I recently ran across a very interesting problem involving database design. I have changed the table names to simplify the problem, so let me describe it as such:
I have an element bound to an entity (C开发者_开发知识库ontact) that exposes some navigation properties.
I found strange thing. For example I have Order and Item entity. Item is reference on Order by id. In EF to save Item, I need firstly load Order, and put it to reference field? Is this only way?
instead of talking let me talk with code: Dim Contact = Context.Contacts.Include(\"Phones\") Dim phone = Contact.Phones(0)