How can i use the 'N'-prefix to save unicode strings to an nvarchar field?

[nick14]

I have an array with values and want to update my database like this:
$result = $ORM->Table[$id]->update($values);
Datatype of a column in sql server is nvarchar.
So in a sql query i can use: 'UPDATE...SET text = N'sample_unicode_string'
how can i do this with notorm?

Thanks, Nick