entity-relationship

相关标签：javascript jquery android 多少钱 iPhone

Entity Framework support for old database that uses -1 to indicate no relationship?

I have a database like the following example: Customer CustomerID int Name... Document DocumentID int CustomerID int[详细]

2023-03-07 06:28 分类：问答
Foreign key contraints interpretation problem

I generate Entity Data Model in Visual studio from the database. However, I noticed that it does not generate 开发者_运维技巧neither relationships nor navigation properties from some foreign keys.It[详细]

2023-03-07 06:11 分类：问答
Code First Mapping for Entity Framework Hierarchy

I have a model that looks like this: public class Category { public string Id { get; set; } public string Description { get; set; }[详细]

2023-03-06 22:57 分类：问答
Which alternative to choose for a database redesign (sports stats, competitions, geographic scopes)? [closed]

Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this[详细]

2023-03-06 18:59 分类：问答
How do you work with Entity relationship within Doctrine 2?

When you want to insert an Entity you do this: $user = new User(); $user->setEmail(\'john@doe.com\');[详细]

2023-03-06 14:35 分类：问答
When are model objects created in MVC3 (ASP.NET)

Trying to understand when model objects are instantiated in MVC3: I have a view for editing a \"Person\"; each person can have multiple addresses.I\'m displaying the addresses in a grid on the Person[详细]

2023-03-06 11:30 分类：问答
Repository pattern: Implementation and lazy loading of model relationships

I have an application which deals with products and product categories. For each of these I have models defined using POCO.[详细]

2023-03-05 08:33 分类：问答
How to prevent a loop in a bi-directional relationship

Say we have the following two entities. Library public class Library { private Collection<Book> books = new ArrayList<Book>();[详细]

2023-03-05 06:30 分类：问答
Rails: validating at least one HABTM relationship

I\'m trying to validate that a has_many-through relationship has at least one value selected upon form submission.For simplicity, let\'s just call the relationship \"relationship\", and thus the ids \[详细]

2023-03-04 01:15 分类：问答
Overcoming "No owner defined between domain classes" in Grails many-to-many relationship

I was following the \"Grails in Action\" book开发者_Python百科 in order to create the following scenario.[详细]

2023-03-03 22:36 分类：问答