entity-relationship

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Core Data - How to establish relationship between two objects in different contexts

In my app, I have the following CoreData model : a Foo has many Bar Entities : Foo <---->> Bar. To add a new Foo entity, I create a new MOC in which I create a new instance of Foo. This displays t[详细]

2023-04-12 23:38 分类：问答
EF Code First - Fluent API (WithRequiredDependent and WithRequiredPrincipal)

I have the following class: public class User { public Guid Id { get; set; } public string Name { get; set; }[详细]

2023-04-12 18:18 分类：问答
Hibernate design dilemma; parent - child relationship with address link

I have an existing entity design. There is an Individual entity. A Guardian or a Minor are stored as Individual. If u r a Minor, u r assigned zero or more guardians. This relationship is stored in a d[详细]

2023-04-12 12:12 分类：问答
Nesting of groups or elements

I\'m fairly new in Mysql, but I have problem that I cannot solve. I will give you an example to demonstrate it. Please note that I know that (for current example) there are other simpler and more effi[详细]

2023-04-12 11:31 分类：问答
Symfony2 OneToOne relationship becomes either a Unique index or a foreign key?

I\'m开发者_Go百科 taking my first steps in Symfony2 entity relations. I have an entity installation, which each has one meter, and one monitor.[详细]

2023-04-11 23:56 分类：问答
Relationships between File Owner, App Delegate, View Controller, etc

Based on the little that i know, I tried to put together the relationships usually seen as part of MainWindow xib.[详细]

2023-04-11 19:48 分类：问答
CORE DATA Many to Many relationship. How to update or set relationship?

I have 2 entities Locations and Items. Many to many relationship. So each item can have multiple locations and any location can have multiple items.[详细]

2023-04-11 05:50 分类：问答
Working with a Model class that has a foreign/navigation key to itself

I am trying to develop a catalog project in ASP.NET MVC 3 and using EF Code first with an existing Database. There is a Categories table in m开发者_Go百科y database that points to itself. For that, I[详细]

2023-04-10 06:11 分类：问答
Relationship Using Code first with Existing database

When defining a relationship between two types is it important to include a navigation property on both types, such as in the following example:[详细]

2023-04-09 01:59 分类：问答
EER : Superclass/subclass Entity relationship, primary key mapping

Here is the scenario. STUDENT, FACULTY are sub-classes ofPERSON entity, and they have specialized attributes.[详细]

2023-04-07 04:35 分类：问答