NET 4 and higher running on Windows or platforms where Mono is available and as of version 5. NET Core. There are no plans to have it support data sources other than relational databases. EF Core runs on. NET Core, and therefore on any platform that supports it. It is based on a provider model that theoretically can work with any kind of data source, not just relational ones.
Work is in progress for Azure Cosmos DB, and others are likely to follow. NHibernate is distributed through NuGet as a single DLL, with no other dependencies unless we need ordered sets, where we also need Iesi. Everything is built in. It needs the full. NET Framework, or. NET Core, of course. Internally, they are both quite extensible, with lots of moving parts, some of which can be replaced. Entity Framework Core builds upon. NET Core facilities like logging and dependency injection, and it leverages those for modifying internal components.
Pretty much anything can be switched. NHibernate does not use dependency injection and the way to replace each service is quite different from service to service.
NET connection. Everything stems from it. With EF, we only need to worry about a DB Context; it includes all the mapping and configuration information, and exposes all APIs for interacting with the datasource. The in-memory provider is particularly useful for unit testing scenarios. Other vendors already make available providers to other databases, for free or commercially. Entity Framework Core uses fluent code-based configuration and fluent or attribute-based mappings.
Built-in conventions cannot be replaced or added to, at this moment. NHibernate has both XML and fluent configuration and mappings.
It also offers attribute mappings through the NHibernate Attributes companion project. Both of them need mappings, in any form.
Both can map non-public members, properties or fields. Also both have the notion of value types owned entities in EF, components in NHibernate. NHibernate can map a property or field to a custom SQL command. Also, both support shadow properties, that is, entities that are part of the database schema, but not mapped into the class model.
With EF Core, we can even query them. No strongly-typed inserts, deletes or updates. Still no support for grouping on the database side, it will be fixed in the next version.
No projections to non-entity types. It is also possible to do updates, deletes or inserts on top of LINQ queries, which is quite nice. Also, HQL is a great language for querying the database in an agnostic way; it is similar to SQL and can even update, insert or delete entries. NHibernate can project to any class, not just anonymous types. NHibernate can use stored procedures or custom SQL for any kind of operation. EF Core still lacks this, which was present in pre-Core versions.
The next step is to create a helper class to connect to our database. Here's what this class would look like:. Note the call to the sessionFactory. OpenSession in the last statement -- this call actually creates a session of communication with the underlying database, i.
You can now invoke the static method FluentNHibernateHelper. OpenSession to open a connection to the database. The following code snippet illustrates how you can take advantage of the helper class created earlier to add a Product record to the Product database table.
The following code snippet shows how you can query data from the database using our Fluent NHibernate helper class. To work with the code examples given in this article, you should ensure that the following namespaces have been added to your class.
Net, as well as a speaker and author of several books and articles. He has more than 20 years of experience in IT including more than 16 years in Microsoft. Net and related technologies. GetExecutingAssembly and this is where program will find mapping files.
Mapping files tell NHibernate how to go from C classes into database tables. SessionFactory compiles all the metadata necessary for initializing NHibernate. SessionFactory can be used to build sessions, which are roughly analogous to database connections.
So the appropriate way is to use it in the using block. I can say var session equals sessionFactory. OpenSession and I'm going to want to do this inside of its transaction. Once the session is opened, we can tell the session to begin a new transaction and we can then perform some logic in here. So perform some database logic and finally commit that transaction.
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