izenda-and-udfs

#Izenda and UDFs (User Defined Functions)

How do I utilize a complex UDF from my database within Izenda?

1) Create UDF in the DB that performs your calculation:

EXAMPLE UDF:

MsSQL

CREATE FUNCTION [dbo].[SafeDivide] (@p1 real ,@p2 real )
RETURNS real 
AS
BEGIN
    RETURN ISNULL(@p1 / NULLIF(@p2, 0), 0)
END

Oracle

create or replace function "SAFEDIVIDE"
(p1 in NUMBER, p2 in NUMBER)
return NUMBER
as
begin
    RETURN ROUND(nvl(p1 / NULLIF(p2, 0), 0), 7);
end;

2) Add this function to Izenda: AdHocSettings.ExtendedFunctions = new string[] { "[dbo].[SafeDivide]" };

3a) You can now choose this function in the 'Fields' tab function drop down for any column. (Functions, as the one above, with more than one input parameter cannot be chosen for a single column in the functions drop-down and must be implemented as an expression)

Example UDF

3b) You can also use this function in the 'Fields' tab's advanced panel 'Expression' input box:

  SELECT CAST(SafeDivide([UnitsInStock], [UnitsOnOrder]) * 100 AS varchar) + '%' FROM Products