NHibernate Multiple Session #146 | Support Center

nobruds created 9 years ago

Hello,

First I want to say that your framework is very nice. Second, I am new to this whole structure, sorry for any wrong statement.

My question is, does the framework support multiple sessions ? If yes, how can I do that?

I mean, my WebSite have two or more connection string, how can I implement that using the NHibernate and DI ?

I did something like the sample "PhoneBook", creating two "xDependencyInstaller", where I created my "CreateNhSessionFactory" there, but when I use two connection string I got an error by castle ioc, saying that I can´t register same assembly (SessionFactory) more than once.

Now I am trying to use like the "SimpleTaskSystem" sample, but I don´t know how to achieve my goals .

PS: I am trying to change the framework to work with nhibernate map by code, so I dont need to use Fluent.

Thanks. Bruno

7 Answer(s)

0

hikalkan created 9 years ago
Support Team

Hi,

ABP does not natively supports more than one database for NHibernate. But I may help you based on your needs. Why do you need it? Do you need to second DB for a limited scope or usage of these 2 databases are balanced?
0
nobruds created 9 years ago
Hello, thanks for the response.

Actually its not 2 DB for the same NHibernate project. let me give you a sample.

I have a financial market system with 3 separated projects: 1 responsible for user authentication and user Data (1 DB) 1 responsible for common searches shared on other systems (1 DB) 1 responsible for the main system operations, like BL, CRUD, etc (1 DB)

Following your samples, I will have 3 different NHibernates class libraries right ? each of them containing my Dependency installers.

So its 3 separated projects that I will use on my asp.net MVC website, How should I install the references there using DI, on the global.asax?

EDIT: Maybe my question is more on the Castle Windsor side. The part that registers the assemblys.

_windsorContainer.Install(FromAssembly.Containing<PineClientesDependencyInstaller>());

i want to install 2 assembly DependencyInstaller, but got an error saying that ISession from nhibernate is already installed.

Its something like this: [http://stackoverflow.com/questions/3351268/what-is-a-correct-approach-to-register-several-instances-for-the-same-type-in-wi])

But if I use that, how do I know which NhRepositoryBase ISession is going to use, DB1 or DB2

Thanks Bruno
0

nobruds created 9 years ago

Hello hikalkan

You was able to check if this is possible?

I was looking to you SimpleTaskSystem sample, basically I want to have two or more "SimpleTaskSystemDataModule" so on theirs PreInitialize method I have my DB configs.

How can I register that using DI ? The framework repositories will know which ISession to use ?

Thanks
0

hikalkan created 9 years ago
Support Team

Hi,

I thought a bit, it's probably not possible without changing something in the framework (probably starting from NhUnitOfWork).

It may be accomplished in a limited scope. Your main db remains same, you can do some special thing for additional dbs. If you check NhRepositoryBase class (<a class="postlink" href="https://github.com/aspnetboilerplate/aspnetboilerplate/blob/master/src/Abp.NHibernate/NHibernate/Repositories/NhRepositoryBaseOfTEntityAndTPrimaryKey.cs">https://github.com/aspnetboilerplate/as ... maryKey.cs</a>), it gets a ISessionProvider in it's constructor which is used to perform database operations. So, you can create a class that implements ISessionProvider and create custom repositories (<a class="postlink" href="http://www.aspnetboilerplate.com/Pages/Documents/NHibernate-Integration">http://www.aspnetboilerplate.com/Pages/ ... ntegration</a>) that injects your session provider. Another way could be create and implement your own repositories that works with different session factories. I can not say exact solution without coding and trying.
0

nobruds created 9 years ago

Hi, thanks for the feedback.

Yes, I think I am going to make some changes on the framework, already did some because I don´t use the Fluent NHibernate. I will try those approach and let you know.

Maybe I will create an SessionFactory dictionary, and inject the specific one on repositories, by name .

I am really new to this that's why I have all those doubts =).

Thanks again. Bruno

nobruds created 9 years ago

Hello again.

I did some changes on PineNHibernateModule and builded 2 SessionFactory, but I am back to that error :

"Component Late bound NHibernate.ISessionFactory could not be registered. There is already a component with that name. Did you want to modify the existing component instead? If not, make sure you specify a unique name."

I changed NhRepositoryInstaller to receive a custom name:

container.Register(
                Component.For<ISessionFactory>()
                    .Named(_sessionFactoryName)
                    .UsingFactoryMethod(() => _sessionFactory)
                    .LifeStyle.Singleton
                );
           container.Register(
                Component.For(typeof(IRepository<>))
                    .ImplementedBy(typeof(NhRepositoryBase<>))
                    .LifestyleTransient(),

                Component.For(typeof(IRepository<,>))
                    .ImplementedBy(typeof(NhRepositoryBase<,>))
                    .LifestyleTransient()
                );

So, i have 2 session now, but I am not understanding how can I inject my session to my repository, can you exemplify for me ?

thanks

0

hikalkan created 9 years ago
Support Team

Hi,

You can not register same interface twice.. If so, how DI can know which should be injected when requested. You can create a different class that use your 2nd session factory, you can write a simple adapter and so on.

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