On 29.10.2011 04:04, Steven Schveighoffer wrote:
I don't like Variant having this behavior when it's only of specific
use. Variant is not a database-only type.
Here's another idea:
struct DBNull(T) { }
Where T is the type for the column. i.e.:
row.column = DBNull!int;
Now, you have your flag indicating it's null (you should be able to
write a function that returns whether the column is null or not), it
doesn't consume any more space (value is already part of a union that's
bigger than DBNull!int), and the type of field is still valid.
This is basically what ADO.Net does:
http://msdn.microsoft.com/en-us/library/system.dbnull.aspx
