MySqlConnector.DependencyInjection 2.4.0-beta.2

About

MySqlConnector.DependencyInjection helps set up MySqlConnector in applications that use dependency injection, most notably in ASP.NET. It allows easy configuration of your MySQL connections and registers the appropriate services in your DI container. It also configures logging by integrating MySqlConnector with the ILoggingFactory registered with the service provider.

How to Use

For example, if using the ASP.NET minimal web API, use the following to register MySqlConnector:

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddMySqlDataSource(builder.Configuration.GetConnectionString("Default"));

This registers a transient MySqlConnection which can get injected into your controllers:

app.MapGet("/", async (MySqlConnection connection) =>
{
    await connection.OpenAsync();
    await using var command = connection.CreateCommand();
    command.CommandText = "SELECT name FROM users LIMIT 1";
    return "Hello World: " + await command.ExecuteScalarAsync();
});

You can use MySqlDataSource directly if you need more than one connection:

app.MapGet("/", async (MySqlDataSource dataSource) =>
{
    await using var connection1 = await dataSource.OpenConnectionAsync();
    await using var connection2 = await dataSource.OpenConnectionAsync();
    // use the two connections...
});

Advanced Usage

The AddMySqlDataSource method also accepts a lambda parameter allowing you to configure aspects of MySqlConnector beyond the connection string.

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddMySqlDataSource("Server=server;User ID=test;Password=test;Database=test",
	x => x.UseRemoteCertificateValidationCallback((sender, certificate, chain, sslPolicyErrors) => { /* custom logic */ })
);

Keyed Services

Use the AddKeyedMySqlDataSource method to register a MySqlDataSource as a keyed service. This is useful if you have multiple connection strings or need to connect to multiple databases. If the service key is a string, it will automatically be used as the MySqlDataSource name; to customize this, call the AddKeyedMySqlDataSource(object?, string, Action<MySqlDataSourceBuilder>) overload and call MySqlDataSourceBuilder.UseName.

builder.Services.AddKeyedMySqlDataSource("users", builder.Configuration.GetConnectionString("Users"));
builder.Services.AddKeyedMySqlDataSource("products", builder.Configuration.GetConnectionString("Products"));

app.MapGet("/users/{userId}", async (int userId, [FromKeyedServices("users")] MySqlConnection connection) =>
{
    await connection.OpenAsync();
    await using var command = connection.CreateCommand();
    command.CommandText = "SELECT name FROM users WHERE user_id = @userId LIMIT 1";
    command.Parameters.AddWithValue("@userId", userId);
    return $"Hello, {await command.ExecuteScalarAsync()}";
});

app.MapGet("/products/{productId}", async (int productId, [FromKeyedServices("products")] MySqlConnection connection) =>
{
    await connection.OpenAsync();
    await using var command = connection.CreateCommand();
    command.CommandText = "SELECT name FROM products WHERE product_id = @productId LIMIT 1";
    command.Parameters.AddWithValue("@productId", productId);
    return await command.ExecuteScalarAsync();
});