NHiberate - Code to make SchemaExport generate database for entities mapping class

gistfile1.cs

using System;
using NHibernate.Cfg;
using NHibernate.Dialect;
using NHibernate.Driver;
using NHibernate.Mapping.ByCode;
using NHibernate.Mapping.ByCode.Conformist;
using NHibernate.Tool.hbm2ddl;

namespace ConsoleApplication1
{
    public class Item
    {
        public int Id { get; set; }
        public string Description { get; set; }
    }

    public class ItemMap : ClassMapping<Item>
    {
        public ItemMap()
        {
            Id(e => e.Id, m => m.Generator(Generators.Identity));

            Property(e => e.Description, m =>
            {
                m.NotNullable(true);
                m.Length(10000);
            });
        }
    }

    class Program
    {
        private const string ConnectionString = @"Data Source=.\SQLEXPRESS;Initial Catalog=db01;Integrated Security=True";

        static void Main(string[] args)
        {
            var modelMapper = BuildModelMapper();
            var configuration = GetConfiguration();
            configuration.AddDeserializedMapping(modelMapper.CompileMappingForAllExplicitlyAddedEntities(), null);

            try
            {
                new SchemaExport(configuration).Execute(false, true, false);
                Console.WriteLine("Done");
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
            Console.ReadLine();
        }

        private static ModelMapper BuildModelMapper()
        {
            var mm = new ModelMapper();
            mm.AddMapping(typeof(ItemMap));
            return mm;
        }

        private static Configuration GetConfiguration()
        {
            var cfg = new Configuration();

            cfg.DataBaseIntegration(db =>
            {
                db.Driver<SqlClientDriver>();
                db.Dialect<MsSql2008Dialect>();
                db.KeywordsAutoImport = Hbm2DDLKeyWords.AutoQuote;
                db.ConnectionString = ConnectionString;
                db.LogFormattedSql = true;
                db.LogSqlInConsole = true;
                db.AutoCommentSql = true;
            });

            return cfg;
        }
    }
}