I haven’t used Nhibernate for a while, but I had a similar problem with a 
custom field, and to do solve it I created a custom user type (class 
IUserType), these links explain how to do it:

https://stackoverflow.com/questions/242022/nhibernate-mapping-to-custom-types

https://web.archive.org/web/20150214164507/http://blog.miraclespain.com/archive/2008/Mar-18.html
 
<https://web.archive.org/web/20150214164507/http:/blog.miraclespain.com/archive/2008/Mar-18.html>

Em segunda-feira, 2 de junho de 2025 às 15:56:28 UTC-3, Michael W Powell 
escreveu:

> Hello,
>
> How do I define a custom type which supports NULL. Defined as a user 
> domain (ULONG) basically a simple NUMERIC(), so perhaps the 
> NHibernate.SqlTypes.SqlTypeFactory.UInt64 is an appropriate basis, but what 
> to do with the ulong? (csharp language level).
>
> Thank you!
>
> Best,
>
> Michael W. Powell
>

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