1
vote
2answers
121 views

Limitations of the Identity Map pattern

After asking about the implementation in Ruby of the Identity Map pattern because the potential memory leak in long running server apps, I am considering my initial concept of that pattern. Initially ...
0
votes
0answers
44 views

Extending database model of ORM in subproject

I have a maven project which contains some entities which are stored in a database. The purpose of this project is to manage personal information, users, locations, etc. This project can work on its ...
1
vote
2answers
96 views

How far can I drift from my original domain model and still have the benefits of an ORM?

I have the following domain models: public class User { public int Id { get; set; } public ICollection<Product> Products { get; set; } } public class Product { public int Id { ...
1
vote
1answer
109 views

PHP - Repository matrix pattern?

I'm trying really hard to refactor some of my legacy code in the project using best practices and design patterns + DDD so I'd love some feedback on an issue I'm currently having. Let's assume that I ...
2
votes
2answers
404 views

NHibernate and complex domain model against a legacy database

I'm trying to refactor (actually, rewrite) an application which currently uses only stored procedures to access the database (hundreds of SPs). My goal is to use Nhibernate and follow a good design as ...
4
votes
2answers
1k views

Do we achieve 100% Persistence Ignorance solution if we're not using ORM's POCO objects to model the Domain?

Persistence ignorance is ability to retrieve/persist standard objects, where standard objects are considered as classes focused on particular business problem and thus don't contain any ...
17
votes
5answers
1k views

Do ORMs enable the creation of rich domain models?

After using Hibernate on most of my projects for about 8 years, I've landed on a company that discourages its use and wants applications to only interact with the DB through stored procedures. After ...
0
votes
4answers
324 views

To which layer does this code belong?

When I say "Revisional Data Model", I mean a data model where information is never lost: Deletes never destroy any rows, and updates always cause an insert somewhere else to preserve a row's previous ...
6
votes
3answers
4k views

DDD with ORM where should the business logic go?

I have used an MDA (model driven architecture) tool in the past where we modeled via UML and this generated the business entities (our domain model) and the ORM (mapping etc) amongst other things. A ...
8
votes
1answer
445 views

Do ORM POCOs replace domain entities?

This is somewhat similar to this question but more broad. In general, with ORMs like EF 4.1 supporting POCOs, does it now make sense to have your domain entities be the objects that are persisted to ...
5
votes
2answers
343 views

How to define the seams between the domain layer and a database full of stored procedures?

We have a legacy database full of stored procedures. These stored procedures are somewhat CRUD-categorized but upon inspection of some procedures, they are not "simple" as they might update, delete, ...