DB2 function error

Question

What's wrong with the following DB2 function?

CREATE FUNCTION MIGRATION.determineToTaxService
(DIGI_NAAR_VLG CHAR, DIGI_VAN_VLG CHAR, NAARVLG CHAR)
RETURNS CHAR
BEGIN ATOMIC
    DECLARE returnValue CHAR;
    SET returnValue = '0';

    IF (DIGI_NAAR_VLG = '1') THEN
        SET returnValue = '1';

    ELSEIF (DIGI_VAN_VLG = '1') THEN
        SET returnValue = '1';

    ELSEIF (NAARVLG = '1') THEN
        SET returnValue = '1';
    END IF;

    RETURN returnValue;
END;

I'm getting this error:

An unexpected token "CHAR" was found following " DECLARE returnValue".  Expected tokens may   include:  "END-OF-STATEMENT". SQL Code: -104, SQL State: 42601
Error occured in:
CREATE FUNCTION MIGRATION.determineToTaxService
   (DIGI_NAAR_VLG CHAR, DIGI_VAN_VLG CHAR,
    NAARVLG CHAR)
RETURNS CHAR
BEGIN ATOMIC
    DECLARE returnValue CHAR

I can't really figure it out. It's also not running if I remove the if and elsif statements so the problem shouldn't be there.

Answer 1

The terminating character is wrong:

CREATE FUNCTION MIGRATION.determineToTaxService
(DIGI_NAAR_VLG CHAR, DIGI_VAN_VLG CHAR, NAARVLG CHAR)
RETURNS CHAR
BEGIN ATOMIC
    DECLARE returnValue CHAR;
    SET returnValue = '0';

    IF (DIGI_NAAR_VLG = '1') THEN
        SET returnValue = '1';

    ELSEIF (DIGI_VAN_VLG = '1') THEN
        SET returnValue = '1';

    ELSEIF (NAARVLG = '1') THEN
        SET returnValue = '1';
    END IF;

    RETURN returnValue;
END @

You can call it from the command line like:

db2 -td@ -vf test

Answer 2

A trick is to end the lines with a comment like:

CREATE FUNCTION MIGRATION.determineToTaxService
    (DIGI_NAAR_VLG CHAR, DIGI_VAN_VLG CHAR, NAARVLG CHAR)
RETURNS CHAR
BEGIN ATOMIC
    DECLARE returnValue CHAR; --
    SET returnValue = '0'; --

    IF (DIGI_NAAR_VLG = '1') THEN
        SET returnValue = '1'; --

    ELSEIF (DIGI_VAN_VLG = '1') THEN
        SET returnValue = '1'; --

    ELSEIF (NAARVLG = '1') THEN
        SET returnValue = '1'; --
    END IF; --

    RETURN returnValue; --
END ;

Then you can continue using ; as a statement terminator

You might want to simplify the function, something like:

CREATE FUNCTION MIGRATION.determineToTaxService
    (DIGI_NAAR_VLG CHAR, DIGI_VAN_VLG CHAR, NAARVLG CHAR)
RETURNS CHAR
RETURN
    CASE WHEN DIGI_NAAR_VLG = '1' THEN '1'
         WHEN DIGI_VAN_VLG = '1' THEN '1'
         WHEN NAARVLG = '1' THEN '1'
         ELSE '0'
    END

should do