| title | author | ms.date | ms.assetid | uid |
|---|---|---|---|---|
Database Providers - EF Core |
rowanmiller |
02/23/2018 |
14fffb6c-a687-4881-a094-af4a1359a296 |
core/providers/index |
Database Providers
Entity Framework Core can access many different databases through plug-in libraries called database providers.
Current providers
[!IMPORTANT]
EF Core providers are built by a variety of sources. Not all providers are maintained as part of the Entity Framework Core Project. When considering a provider, be sure to evaluate quality, licensing, support, etc. to ensure they meet your requirements. Also make sure you review each provider's documentation for detailed version compatibility information.
Adding a database provider to your application
Most database providers for EF Core are distributed as NuGet packages, and can be installed as follows:
.NET Core CLI
dotnet add package provider_package_name
Visual Studio
install-package provider_package_nameOnce installed, you will configure the provider in your DbContext, either in the OnConfiguring method or in the AddDbContext method if you are using a dependency injection container.
For example, the following line configures the SQL Server provider with the passed connection string:
optionsBuilder.UseSqlServer(
"Server=(localdb)\mssqllocaldb;Database=MyDatabase;Trusted_Connection=True;");Database providers can extend EF Core to enable functionality unique to specific databases.
Some concepts are common to most databases, and are included in the primary EF Core components.
Such concepts include expressing queries in LINQ, transactions, and tracking changes to objects once they are loaded from the database.
Some concepts are specific to a particular provider.
For example, the SQL Server provider allows you to configure memory-optimized tables (a feature specific to SQL Server).
Other concepts are specific to a class of providers.
For example, EF Core providers for relational databases build on the common Microsoft.EntityFrameworkCore.Relational library, which provides APIs for configuring table and column mappings, foreign key constraints, etc.
Providers are usually distributed as NuGet packages.
[!IMPORTANT]
When a new patch version of EF Core is released, it often includes updates to theMicrosoft.EntityFrameworkCore.Relationalpackage. When you add a relational database provider, this package becomes a transitive dependency of your application. But many providers are released independently from EF Core and may not be updated to depend on the newer patch version of that package. In order to make sure you will get all bug fixes, it is recommended that you add the patch version ofMicrosoft.EntityFrameworkCore.Relationalas a direct dependency of your application.