static void Main(string[] args)
{
Console.WriteLine("oRACLE");
IDataSpace db;
db = new Oracle();
db.Selecct();
db.Insert();
db.Delete();
db.Update();
Console.WriteLine("SQL sERVER");
IDataSpace sqlserver;
sqlserver = new SQLServer();
sqlserver.Selecct();
sqlserver.Insert();
sqlserver.Delete();
sqlserver.Update();
}