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Entity Framework Core
In this guide we will set up EFCore with a PostgreSQL database. Information on other databases will be at the bottom of this page.
Prerequisites
- A simple bot with dependency injection configured
- A running PostgreSQL instance
- EFCore CLI tools
Downloading the required packages
You can install the following packages through your IDE or go to the nuget link to grab the dotnet cli command.
| Name | Link |
|---|---|
Microsoft.EntityFrameworkCore |
link |
Npgsql.EntityFrameworkCore.PostgreSQL |
link |
Configuring the DbContext
To use EFCore, you need a DbContext to access everything in your database. The DbContext will look like this. Here is an example entity to show you how you can add more entities yourself later on.
[!code-csharpDBContext Sample]
[!NOTE]
To learn more about creating the EFCore model, visit the following link
Adding the DbContext to your Dependency Injection container
To add your newly created DbContext to your Dependency Injection container, simply use the extension method provided by EFCore to add the context to your container. It should look something like this
[!code-csharpDBContext Dependency Injection]
[!NOTE]
You can find out how to get your connection string here
Migrations
Before you can start using your DbContext, you have to migrate the changes you've made in your code to your actual database.
To learn more about migrations, visit the official Microsoft documentation here
Using the DbContext
You can now use the DbContext wherever you can inject it. Here's an example on injecting it into an interaction command module.
[!code-csharpDBContext injected into interaction module]
Using a different database provider
Here's a couple of popular database providers for EFCore and links to tutorials on how to set them up. The only thing that usually changes is the provider inside of your DbContextOptions
| Provider | Link |
|---|---|
| MySQL | link |
| SQLite | link |