Command/query implementation with async methods

CommandQuery.cs

using System.Data;

namespace CommandQuery
{
    public interface ICommand
    {
        Task ExecuteAsync(IDbConnection db);
    }

    public interface IQuery<T>
    {
        Task<T> ExecuteAsync(IDbConnection db);
    }

    public interface IDatabase
    {
        Task<T> ExecuteAsync<T>(IQuery<T> query);
        Task ExecuteAsync(ICommand command);
    }

    public class SqlDatabase : IDatabase
    {
        private readonly string connectionString;

        public SqlDatabase(string connectionString)
        {
            this.connectionString = connectionString;
        }

        public async Task<T> Execute<T>(IQuery<T> query)
        {
            using (var db = await GetConnection())
            {
                return await query.ExecuteAsync(db);
            }
        }

        public async Task Execute(ICommand command)
        {
            using (var db = await GetConnection())
            {
                await command.ExecuteAsync(db);
            }
        }

        private async Task<IDbConnection> GetConnection()
        {
            var connection = new SqlConnection(connectionString);
            return await connection.OpenAsync();
        }
    }
}