using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using LinqToDB;
using LinqToDB.Configuration;
using LinqToDB.DataProvider;
using MySql.Data.MySqlClient;
using twitter.Properties;
using DataModels;

namespace twitter.classes
{
    class core
    {
        public static string DatabaseHost
        {
            get { return Settings.Default["databasehost"].ToString(); }
            set { Settings.Default["databasehost"] = value; }
        }

        public static string DatabaseUser
        {
            get { return Settings.Default["databaseuser"].ToString(); }
            set { Settings.Default["databaseuser"] = value; }
        }

        public static string DatabaseName
        {
            get { return Settings.Default["databasename"].ToString(); }
            set { Settings.Default["databasename"] = value; }
        }

        public static string DatabasePassword
        {
            get { return Settings.Default["databasepass"].ToString(); }
            set { Settings.Default["databasepass"] = value; }
        }

        public class ConnectionStringSettings : IConnectionStringSettings
        {
            public string ConnectionString { get; set; }
            public string Name { get; set; }
            public string ProviderName { get; set; }
            public bool IsGlobal => false;
        }

        public class MySettings : ILinqToDBSettings
        {
            public IEnumerable<IDataProviderSettings> DataProviders
            {
                get { yield break; }
            }

            public string DefaultConfiguration => "Twitters"; // lets set your configuration as default, so you can call just new DataContext() or new DataConnection()
            public string DefaultDataProvider => ProviderName.MySql; // and set default database type

            private static IDataProvider GetDataProvider()
            {
                return new LinqToDB.DataProvider.MySql.MySqlDataProvider();
            }

            public IEnumerable<IConnectionStringSettings> ConnectionStrings
            {
                get
                {
                    yield return

                        new ConnectionStringSettings
                        {
                            Name = "Twitters", // This is configuration name, you pass it to DataConnection constructor
                            ProviderName = ProviderName.MySql, // here we are setting database we are working with
                            ConnectionString = "server=" + DatabaseHost + "; database=" + DatabaseName + "" + ";user=" + DatabaseUser + "; password=" + DatabasePassword + ";",
                        };
                }
            }
        }

        public class DbTwitters : LinqToDB.Data.DataConnection
        {
            public DbTwitters() : base("Twitters") { }

            public ITable<Account> Accounts { get { return GetTable<Account>(); } }
            public ITable<Favorite> Favorites { get { return GetTable<Favorite>(); } }
            public ITable<Retweet> Retweets { get { return GetTable<Retweet>(); } }

        }

        internal class MySqlDataReader
        {
        }

    }
}

using (var db = new TwitterDB())
{
    var query = from a in db.Accounts
                select a;

<system.data>
  <DbProviderFactories>
    <remove invariant="MySql.Data.MySqlClient" />
    <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.9.9.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
  </DbProviderFactories>
</system.data>