Entity Framework

EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations.

Code Quality Rank: L1

Programming language: C#

License: MIT License

Tags: SQL     Framework     Server     Data     Entity     Core     Entity-framework-core     EF     O/RM    

Latest version: v5.0.1

README

Repository

This repository is home to the following .NET Foundation projects. These projects are maintained by Microsoft and licensed under the [MIT License](LICENSE.txt).

• Entity Framework Core
• Microsoft.Data.Sqlite

Entity Framework Core

EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations. EF Core works with SQL Server, Azure SQL Database, SQLite, Azure Cosmos DB, MySQL, PostgreSQL, and other databases through a provider plugin API.

Installation

EF Core is available on NuGet. Install the provider package corresponding to your target database. See the list of providers in the docs for additional databases.

dotnet add package Microsoft.EntityFrameworkCore.SqlServer
dotnet add package Microsoft.EntityFrameworkCore.Sqlite
dotnet add package Microsoft.EntityFrameworkCore.Cosmos

Use the --version option to specify a preview version to install.

Daily builds

We recommend using the [daily builds](docs/DailyBuilds.md) to get the latest code and provide feedback on EF Core. These builds contain latest features and bug fixes; previews and official releases lag significantly behind.

Basic usage

The following code demonstrates basic usage of EF Core. For a full tutorial configuring the DbContext, defining the model, and creating the database, see getting started in the docs.

using (var db = new BloggingContext())
{
    // Inserting data into the database
    db.Add(new Blog { Url = "http://blogs.msdn.com/adonet" });
    db.SaveChanges();

    // Querying
    var blog = db.Blogs
        .OrderBy(b => b.BlogId)
        .First();

    // Updating
    blog.Url = "https://devblogs.microsoft.com/dotnet";
    blog.Posts.Add(
        new Post
        {
            Title = "Hello World",
            Content = "I wrote an app using EF Core!"
        });
    db.SaveChanges();

    // Deleting
    db.Remove(blog);
    db.SaveChanges();
}

Build from source

Most people use EF Core by installing pre-build NuGet packages, as shown above. Alternately, [the code can be built and packages can be created directly on your development machine](./docs/getting-and-building-the-code.md).

Contributing

We welcome community pull requests for bug fixes, enhancements, and documentation. See [How to contribute](./.github/CONTRIBUTING.md) for more information.

Getting support

If you have a specific question about using these projects, we encourage you to ask it on Stack Overflow. If you encounter a bug or would like to request a feature, submit an issue. For more details, see [getting support](.github/SUPPORT.md).

Microsoft.Data.Sqlite

Microsoft.Data.Sqlite is a lightweight ADO.NET provider for SQLite. The EF Core provider for SQLite is built on top of this library. However, it can also be used independently or with other data access libraries.

Installation

The latest stable version is available on NuGet.

dotnet add package Microsoft.Data.Sqlite

Use the --version option to specify a preview version to install.

Daily builds

We recommend using the [daily builds](docs/DailyBuilds.md) to get the latest code and provide feedback on Microsoft.Data.Sqlite. These builds contain latest features and bug fixes; previews and official releases lag significantly behind.

Basic usage

This library implements the common ADO.NET abstractions for connections, commands, data readers, and so on. For more information, see Microsoft.Data.Sqlite on Microsoft Docs.

using (var connection = new SqliteConnection("Data Source=Blogs.db"))
{
    connection.Open();

    var command = connection.CreateCommand();
    command.CommandText = "SELECT Url FROM Blogs";

    using (var reader = command.ExecuteReader())
    {
        while (reader.Read())
        {
            var url = reader.GetString(0);
        }
    }
}

Build from source

Most people use Microsoft.Data.Sqlite by installing pre-build NuGet packages, as shown above. Alternately, [the code can be built and packages can be created directly on your development machine](./docs/getting-and-building-the-code.md).

Contributing

We welcome community pull requests for bug fixes, enhancements, and documentation. See [How to contribute](./.github/CONTRIBUTING.md) for more information.

Getting support

If you have a specific question about using these projects, we encourage you to ask it on Stack Overflow. If you encounter a bug or would like to request a feature, submit an issue. For more details, see [getting support](.github/SUPPORT.md).

See also

• Documentation
• Roadmap
• Weekly status updates
• Release planning process
• How to write an EF Core provider
• [Security](./docs/security.md)
• [Code of conduct](.github/CODE_OF_CONDUCT.md)