Atlas Provider for EF Core

Load Entity Framework schemas into an Atlas project.

Use-cases

1. Declarative migrations - use a Terraform-like atlas schema apply --env ef command to apply your EF schema to the database.
2. Automatic migration planning - use atlas migrate diff --env ef to automatically plan a migration from the current database version to the EF schema.

Installation

Windows:

Use PowerShell to download the file:

Invoke-WebRequest https://release.ariga.io/atlas/atlas-windows-amd64-latest.exe -OutFile atlas.exe

Then move the Atlas binary to a file location on your system PATH.

macOS + Linux:

curl -sSf https://atlasgo.sh | sh

See atlasgo.io for more installation options.

AtlasEF Package

Make sure to have a tool manifest available in your repository or create one using the following command:

dotnet new tool-manifest

Install the AtlasEF package from the command line:

dotnet tool install atlas-ef

Let's check if the tool is installed correctly:

dotnet atlas-ef --version

Configuration

By default, this tool will scan for implementation of the DbContext class in the current project and will generate a database schema based on it.

This tool does not require a database connection, but it does need Database Providers restored.

Setup Atlas

In your project directory, create a new file named atlas.hcl with the following contents:

data "external_schema" "ef" {
  program = [
    "dotnet",
    "atlas-ef",
  ]
}

env {
  name = atlas.env
  src = data.external_schema.ef.url
  dev = "docker://mysql/8/dev" # list of dev dbs can be found here: https://atlasgo.io/concepts/dev-database
  migration {
    dir = "file://atlas-migrations"
  }
  format {
    migrate {
      diff = "{{ sql . \"  \" }}"
    }
  }
}

Usage

Once you have the provider tool and Atlas configured, you can use them to manage your database schema.

Apply

You can use the atlas schema apply command to plan and apply a migration on your database from your current EF schema. This works by inspecting the target database schema and comparing it to the EF schema, creating a migration plan. Atlas will prompt you to confirm the migration plan before applying it to the database.

Note: For Windows users, you need to use the atlas.exe command instead of atlas.

atlas schema apply --env ef -u "mysql://root:password@localhost:3306/mydb"

The -u flag accepts the URL to the target database.

Diff

Atlas supports a versioned migration workflow, where each change to the database is versioned and recorded in a migration file. You can use the atlas migrate diff command to automatically generate a migration file that will migrate the database from its latest revision to the current EF schema.

Note: For Windows users, you need to use the atlas.exe command instead of atlas.

atlas migrate diff --env ef 

Supported Databases

The provider supports the following databases:

• SQL Server
• MySQL
• PostgreSQL
• SQLite

License

This project is licensed under the Apache License 2.0.