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MQSeries.net Forum Index » WebSphere Message Broker (ACE) Support » Strange behavior while looping

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Kraven12
PostPosted: Wed Feb 19, 2003 10:58 am    Post subject: Strange behavior while looping Reply with quote

Novice

Joined: 21 Oct 2001
Posts: 21
I have a need to store pieces of a message into a database under certain conditions. I am trying to create a string of all the values of that section within a loop so as to avoid writing out each field. It appears as though the concatention is not working. Any help is appreciated. Here is the code:

SET g = CARDINALITY(InputRoot.MRM.INDV_REC.*[]);
WHILE i <= g DO
EVAL('SET v = InputRoot.MRM.INDV_REC.' || FIELDNAME(InputRoot.MRM.INDV_REC.*[i]));
SET ans = ans || v;
SET i = i + 1;
END WHILE;

If I put "ans" into the usr section of the RF2 header nothing appears. If I do a "bitstream" on ans and put that into the usr section I see data.

Any idea why the string concatenation is not showing up?

Thanks in advance.
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jefflowrey
PostPosted: Thu Feb 20, 2003 6:40 am    Post subject: Reply with quote

Grand Poobah

Joined: 16 Oct 2002
Posts: 19981
You shouldn't be using eval at all here - it's unecessary and slow.

You don't appear to have pasted the code where you initialized i (and if you're using v 2.1, you will see speed improvements if you use Reference variables instead of a Cardinality loop).

Are you trying to create a string made up of pieces like "<fieldname>.<fielddata>"?

Try something like this.
set i = 1;
set g= Cardinality(InputRoot.MRM.INDV_REC.*[]);
WHILE i <g DO
SET v = FIELDNAME(InputRoot.MRM.INDV_REC.*[i])||'.'||InputRoot.MRM.INDV_REC.*[i ];
set ans = ans||cast(v as character);
SET I=I+1;
END WHILE;

You may also be able to get what you by using just bitstream or asbitstream to flatten your tree, without having to use the loop or concatenation at all.
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