How to create a function in DB2 that returns the value of a sequence?

How to create a function in DB2 that obtains a value from a sequence and returns it?

It should be possib开发者_如何转开发le to use that function in select or insert statement, e.g:

select my_func() from xxx
insert into xxx values(my_func())

Basically I am using the sequence value in a complex formula, and I'd like to encapsulate the calculation inside a function.

Edit: I am not asking how to simply get next value from sequence.

---

CREATE FUNCTION "MYSCHEMA"."MY_FUNC"(PARAM1 VARCHAR(4000))
     RETURNS INT
SPECIFIC SQL110520140321900 BEGIN ATOMIC
     DECLARE VAR1 INT;
     DECLARE VAR2 INT;
     SET VAR1  = NEXTVAL FOR MY_SEQ;
     SET VAR2 = VAR1 + 2000; --or whatever magic you want to do
     RETURN VAR2;
END

To try it out:

SELECT MY_FUNC('aa') FROM SYSIBM.SYSDUMMY1;