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| mverh |
 Posted: Tue May 28, 2002 6:32 am Post subject: WMQI V2.1 CSD02 Reference Variables |
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Voyager
Joined: 06 Mar 2002
Posts: 97
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Has anyone used reference variables when trying to populate an MRM message on output...I have a microflow that xforms a n XML input message to an MRM output message...it all works great...I then try to improve readability and hopefully performance by using a reference variable...
Before:
SET "OutputRoot"."MRM"."MQ_HEADER_V1"."ACAI_STRUCT_ID" = 'ACAI';
===> works!
After:
DECLARE ref_ACAI REFERENCE TO "OutputRoot"."MRM"."MQ_HEADER_V1";
SET "ref_ACAI"."ACAI_STRUCT_ID" = 'ACAI';
===> fails!
Trace shows the following error:
RecoverableException BIP2230E: Error detected whilst processing a message in node 'CUST.INQ.RQ.V0R0M1.CustomerInquireRequestQueue'.
The message broker detected an error whilst processing a message in node 'CUST.INQ.RQ.V0R0M1.CustomerInquireRequestQueue'. An exception has been thrown to cut short the processing of the message.
See the following messages for details of the error.
2002-05-28 10:41:51.202999 2688 ParserException BIP5354E: MTI internal error: diagnostic information 'parseRightSibling called before RefreshElementFromBitstream'.
An internal software error has occurred in the Message Translation Interface Parser. The diagnostic information associated with this message is: 'parseRightSibling called before RefreshElementFromBitstream'.
Thanks...
_________________
Marc Verhiel
IBM Canada Ltd. |
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| zpat |
| Posted: Tue May 28, 2002 7:06 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5849
Location: UK
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| You can only reference existing elements, so use the CREATE or SET statement to make sure they exist before using a reference. |
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| mverh |
| Posted: Tue May 28, 2002 9:44 am Post subject: |
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Voyager
Joined: 06 Mar 2002
Posts: 97
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So would coding the following work:
DECLARE ref_ACAI REFERENCE TO "OutputRoot"."MRM"."MQ_HEADER_V1";
SET "OutputRoot"."MRM"."MQ_HEADER_V1" = NULL;
...
SET "ref_ACAI"."ACAI_STRUCT_ID" = 'ACAI';
...
???
I would think not...but how else could I equate my "OutputRoot"."MRM"."MQ_HEADER_V1" to something that would make it valid when the parser attempts to serialize it...
_________________
Marc Verhiel
IBM Canada Ltd. |
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| kirani |
| Posted: Tue May 28, 2002 7:54 pm Post subject: |
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Jedi Knight
Joined: 05 Sep 2001
Posts: 3779
Location: Torrance, CA, USA
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I guess, if you change the sequence of DECLARE REFERENCE and SET statement then it will work, i.e.
SET "OutputRoot"."MRM"."MQ_HEADER_V1" = NULL;
DECLARE ref_ACAI REFERENCE TO "OutputRoot"."MRM"."MQ_HEADER_V1";
..
SET "ref_ACAI"."ACAI_STRUCT_ID" = 'ACAI';
..
To me following ESQL code looks more readable than above code,
SET "OutputRoot"."MRM"."MQ_HEADER_V1"."ACAI_STRUCT_ID" = 'ACAI';
If you are building an output tree from input tree then you can use REFERENCE to point to input tree and that will increases readability. For example,
DECLARE ref_data REFERENCE TO InputRoot.XML.Tag1.Data;
SET OutputRoot.MRM.DATA = ref_data.Name;
Hope this helps.
_________________
Kiran
IBM Cert. Solution Designer & System Administrator - WBIMB V5
IBM Cert. Solutions Expert - WMQI
IBM Cert. Specialist - WMQI, MQSeries
IBM Cert. Developer - MQSeries
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| mverh |
| Posted: Wed May 29, 2002 3:15 am Post subject: |
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Voyager
Joined: 06 Mar 2002
Posts: 97
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| Kiran, I agree that the readability is a minor issue with this simple example...but I have numerous fields in the MQ_HEADER_V1 structure that need to be set as well as many in structures that follow the header...so using the reference will help readability when all fields are being set...also I have been led to believe that reference variables improve performance...I haven't tried the change I suggested to see if it works ...when I do I update the thread... |
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| mverh |
| Posted: Fri May 31, 2002 3:24 am Post subject: |
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Voyager
Joined: 06 Mar 2002
Posts: 97
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| Making the changes to the ESQL that sets the reference to NULL doesn't solve this problem...still invesigating... |
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| Yanghui |
| Posted: Wed Jun 05, 2002 1:59 am Post subject: |
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Disciple
Joined: 08 May 2002
Posts: 151
Location: Dublin, Ireland
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In the output side, I normally create the field first by the following ESQL:
CREATE FIELD "OutputRoot"."MRM"."MQ_HEADER_V1";
DECLARE ref_ACAI REFERENCE TO "OutputRoot"."MRM"."MQ_HEADER_V1";
SET ref_ACAI."ACAI_STRUCT_ID" = 'ACAI';
BTW, I don't think you need double quote for reference variables.
Hope it helps.
-Yanghui |
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| mverh |
| Posted: Wed Jun 05, 2002 9:37 am Post subject: |
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Voyager
Joined: 06 Mar 2002
Posts: 97
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| Thanks for the tip Yanghui...that worked like a charm... |
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