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Status Is a defect
Workspace IBM i
Created by Guest
Created on Dec 24, 2019

CLOB Pointers in RPG Not Working

RPG A calls RPG B, passing pointer to CLOB. RPG B receives pointer, and uses it as base for CLOB there. Both compile. Both execute with no bombs. But based CLOB in RPG B does not reflect data in CLOB in RPG A.


Use Case:

Program A creates a CLOB and populates it with 2mb of JSON data. Program A calls Program B which is supposed to send the CLOB data from Program A via a POST REST service or MQ msg. We use two programs to adhere to a SoC (separation of concerns) and to place our logic in multi-tiers, keeping things modular. But this will not work. We are forced to put the CLOB in an SQL VARIABLE and Program B reads it from there. This works but is not the cleanest way.


Idea priority High
  • Guest
    Apr 10, 2020

    This is a defect and needs to be addressed with a CASE. Please open support case for this.

  • Guest
    Feb 18, 2020

    Guys, thanks for the comments...It seems I should open a ticket next. Bob, yes I considered using a locator, but it seems not a good use case for our issue.

  • Guest
    Feb 18, 2020

    Please post code that shows how you are coding the CLOB in both programs, including the Prototype and Procedure Interface.

  • Guest
    Feb 17, 2020

    Dan, did you create a ticket for this?

  • Guest
    Feb 9, 2020

    Just to help... LOB Locators are what you're talking about, right? CLOB Pointers... not really a thing in RPG IV.
    A LOB Locator can be passed between programs since it is an Integer. But you have the Free the LOB Locator when you're finished using it.
    I think (hence do not know for sure) that all access to LOB (CLOB BLOB DBLOB) objects is via LOB Locators in DB2 for i.
    So it may be that you doing things that give you the impression you're getting a point to the LOB, but in fact, you're getting a 4-byte binary integer.
    But I could be wrong.

  • Guest
    Dec 30, 2019

    Have you opened a support case on this? Seems more like a bug than an enhancement.