Creating a simple UDF

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Amit - 18 Apr 2006 16:49 GMT

I'm trying to create a simple UDF like so:

CREATE FUNCTION MYSCHEMA.GETUSERDEPT(USR_ID INTEGER)
    RETURNS VARCHAR ( 256 )
    LANGUAGE SQL
    NO EXTERNAL ACTION
RETURN SELECT DEPT_NAME FROM ABC.DEPT WHERE DEPT.USR_ID = USR_ID;

Simple enough, right? When I try to run it, I get this error:

SQL0199N The use of the reserved word "FROM" following "" is not
valid.
Expected tokens may include: "ON AFTER <INTEGER>". SQLSTATE=42601

I know I'm missing something minor but can't figure it out

I'm using DB2 OS/390 8.1.0.

Thanks
Amit

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Serge Rielau - 18 Apr 2006 18:55 GMT

> I'm trying to create a simple UDF like so:
>
[quoted text clipped - 3 lines]
> NO EXTERNAL ACTION
> RETURN SELECT DEPT_NAME FROM ABC.DEPT WHERE DEPT.USR_ID = USR_ID;

You return a scalar subquery. Try wrapping it into braces:
RETURN (SELECT DEPT_NAME FROM ABC.DEPT WHERE DEPT.USR_ID = USR_ID);

DB2 for LUW is more relaxed here because it supports table functions.
DB2 zOS does not so:
RETURN <expr>

<expr> = [.... | ( <subselect> )]

Cheers
Serge

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Serge Rielau
DB2 Solutions Development
IBM Toronto Lab

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Amit - 18 Apr 2006 20:44 GMT

Thanks for your reply, I made some progress. I tried putting
parenthesis around the SELECT statement but now I get this error:

[IBM][DB2] SQL0214N An expression in the ORDER BY clause in the
following position, or starting with "0" in the "RETURN" clause is not
valid. Reason code = "7". SQLSTATE=42822

This is the exact sql:

CREATE FUNCTION MYSCHEMA.GETUSERDEPT(
        USR_ID        INTEGER)
    RETURNS VARCHAR ( 256 )
    LANGUAGE SQL
    NO EXTERNAL ACTION
RETURN (SELECT DEPT_NM FROM ABC.DEPT WHERE DEPT.USR_ID = USR_ID);

-Amit

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Serge Rielau - 18 Apr 2006 21:24 GMT

Well, we got past the syntax error.. That's good.
Staring at the zOS docs I see:

The expression cannot contain a scalar fullselect.

Bummer...

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Serge Rielau
DB2 Solutions Development
IBM Toronto Lab

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Amit - 18 Apr 2006 21:32 GMT

D'oh! That sucks.
Thanks anyways!

-Amit

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