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Status Future consideration
Workspace IBM i
Categories Db2 for i
Created by Guest
Created on Aug 2, 2021

Enhance SQL UDTF LANGUAGE SQL INCLUDE statement to support user-written C functions

When building new capability for the #IBMi platform, we use the CREATE TABLE FUNCTION and CREATE FUNCTION SQL statements with the "INLINE" statement, to pull in source code written in the C language.
Today, one "block" of code is permitted per include but not user-written functions can be pulled in.
Extend this capability to allow _named_ user-written functions to be pulled in (see Use Case) for example.

Use Case:

Today, inline C code has to be coded as:

// C logic here

While there can be multiple INCLUDE statements in the SQL Source body, the { } brackets are all that are permitted. What we need is the ability to include and call our own named, user-written C functions. Such as

// inline C code
myFoo(parm1, parm2);

int myFoo(char* p1, int p2)


Today the "myFoo" function has to be developed and compiled separately and stored in a *SRVPGM and then linked.
Making our inline code look like old RPGII Order Entry programs (one huge inline routine) which isn't appealing.

Idea priority Medium
  • Guest
    Sep 24, 2021

    IBM will use this request as input to planning but no commitment is made or implied. This request will be updated in the future if IBM implements it.

  • Guest
    Sep 13, 2021

    The CEAC has reviewed this requirement and recommends that IBM view this as a MEDIUM priority requirement that should be addressed.

    Background: The COMMON Europe Advisory Council (CEAC) members have a broad range of experience in working with small and medium-sized IBM i customers. CEAC has a crucial role in working with IBM i development to help assess the value and impact of individual RFEs on the broader IBM i community and has therefore reviewed your RFE.

    To find out how CEAC help to shape the future of IBM i, see CEAC @ and the article "The Five Hottest IBM i RFEs Of The Quarter" at

    Therese Eaton – CEAC Program Manager, IBM

  • Guest
    Aug 7, 2021

    Hi Niels,
    Yes, I want to edit/test externally and incorporate it as one include.
    I've also done multiple include's in one UDTF to get additional capabilities but I'm constantly having to "trick" the compiler into working as expected.
    Your suggestion of inline C code is interesting and probably just a valid an RFE (have you submitted one?) because I see Scott F posting examples that use INSERT to create the C code and then the UDTF is compiled... that would be so much cleaner if you could also do what you're suggesting:

    my inline C code goes here
    Which means you should also be able to do this:


  • Guest
    Aug 3, 2021

    Hello Bob,

    I know exactly what you are after, and another argument for you RFE is that you need one "include" pr. section - which makes code with just a little complexity - almost unreadable. Here you have a "good" bad example:

    But why is you RFE not about having a "INLINE" feature where you put everything into the source in one go? Is it because you like to have the c-source separate so you can valid check it ?

    Anyways - I use the include feature a lot - take a look at my gist i.e.