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18tillidie
PostPosted: Mon Jul 27, 2020 11:02 am Post subject: Compute node Transaction. Reply with quote

Newbie

Joined: 04 May 2020
Posts: 8

Hi I am new to IIB and I need help to know the reason why the transaction is not being rolled back for a DB insert inside a while loop.

The compute node transaction property is set to 'Automatic'

Here is the code snippet.

WHILE LASTMOVE(reftoMessage) DO

SET A = reftoMessage.a;
SET B = reftoMessage.b;

call AddToDb(A,B);

SET C = reftoMessage.c;
SET D = reftoMessage.d;

call AddToDb2(C,D);


MOVE reftoMessage NEXTSIBLING REPEAT TYPE NAME;
END WHILE;

This loop runs for each record reftoMessage which is pointing to a DFDL.

AddToDb(A,B) and AddToDb2(C,D) are calling oracle stored procedures which insert values to the DB using EXTERNAL.
If there is any exception in SET D = reftoMessage.d; - say data type exception then the call AddToDb(A,B); should be rolled back where as I still see a new entry in the DB. even when the code comes out of the failure terminal or the Compute node.

Please help how to handle this exception.

Thank you.
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Vitor
PostPosted: Mon Jul 27, 2020 11:56 am Post subject: Re: Compute node Transaction. Reply with quote

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Joined: 11 Nov 2005
Posts: 26015
Location: Texas, USA

18tillidie wrote:
AddToDb(A,B) and AddToDb2(C,D) are calling oracle stored procedures which insert values to the DB using EXTERNAL.
If there is any exception in SET D = reftoMessage.d; - say data type exception then the call AddToDb(A,B); should be rolled back where as I still see a new entry in the DB. even when the code comes out of the failure terminal or the Compute node.


The oracle stored procedure isn't in the same unit of work (transaction) as IIB. So the stored procedure will commit the result on completion because it's transaction is finished. This would be true for a stored procedure called from any language, not just from IIB.

18tillidie wrote:
Please help how to handle this exception.


Options:
- set up an XA transaction linking IIB & Oracle so that the stored procedure runs in the same unit of work as IIB and the commit/rollback is coordinated between the 2 products
- Use an ESQL INSERT statement to add records to the database. For a simple insert there's very little value in calling a stored procedure
- Add an equivalent RemoveFromDb(A,B) stored procedure to the IIB exception handling flow

The choice of solution is a choice you need to make based on your exact requirements. Other options are undoubtedly possible and may be better.
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