extensible and modular ORM for asp.net mvc

Question

I am developing an asp.net mvc project which consist of a core library and other libraries (as modules). In core biliary I defined main entities like UserAccount, Logging and etc and warp them in a class which is inherited from DbContext. Every single module has its own entity and model, and every module can be added to main project later, I mean they are not already built. Consider a scenario where I have create a new module, which contains News, Comments and Category entities, I want to plug this to main application, and also use the DbContext defined in core library, but as you know, in Code-First Approach, it will throw an exception, and want me to re-create the database, because the model has changed.

Is there any solution for this problem ? and way to make DbContext extensible ? Somebody suggested GenericRepository but I don`t know how to make it work with my problem (I already use GenericRepository for core entities). Some guy has declared in his question that it is possible with nHibernate. Is it really works for my problem ?

score 0 · Answer 1 · answered Sep 11 '11 at 16:19

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If your problem is recreating the database you can use SQL migrations for incremental database development. http://www.hanselman.com/blog/EntityFrameworkCodeFirstMigrationsAlphaNuGetPackageOfTheWeek10.aspx

answered Sep 11 '11 at 16:19

Jayantha Lal Sirisena

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In the article, hanselman mentioned "console inside Visual Studio", where is this console located? – Babak Fakhriloo Sep 11 '11 at 16:40
I uses the console package manager and it output this error 'The term 'update-database' is not recognized as the name of a cmdlet,', I even updated to last version of EF. – Babak Fakhriloo Sep 11 '11 at 17:16
you need to install `Nugt pakag manager console` first. Use `Tools->Extension manager` to install it. And then using `Nueget Packag Manager` you need to install 'SQLMigrations'. – Jayantha Lal Sirisena Sep 12 '11 at 03:16
I already have 'Nugt pakag manager console' installed in visual studio and I successfully installed SQLMigrations, with out any errors. – Babak Fakhriloo Sep 12 '11 at 05:38
Have you installed `Entity Framework - 4.1 Update 1` http://www.microsoft.com/download/en/details.aspx?id=26825 – Jayantha Lal Sirisena Sep 12 '11 at 08:30
Yes I also downloaded and installed it. – Babak Fakhriloo Sep 12 '11 at 16:04

score 0 · Answer 2 · answered Sep 19 '11 at 06:23

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I found a solution on msdn community : Extending DbContext for modular programming

answered Sep 19 '11 at 06:23

Babak Fakhriloo

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extensible and modular ORM for asp.net mvc

2 Answers2