> Why do you not support UDF. Or JayBird has UDF support but it must be
> previously registered, how?

If your database has already registered UDFs, you can use them in SQL
statements that you execute via JayBird. You can register UDFs the
same way as with ISQL (however you need to parse the script yourself).
UDF support has nothing to do with JayBird, but with database.

Best regards,
Roman Rokytskyy