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| MQMD Encoding |
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| Karan |
 Posted: Fri Nov 09, 2012 12:35 am Post subject: MQMD Encoding |
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Apprentice
Joined: 21 Oct 2009
Posts: 29
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Hi,
Iv read many of the posts/infocenter/other resources on ccsid and have a decent understanding of it. What Im still not clear about , is (MQMD.)Encoding. Im aware Encoding applies to numeric data.
Im trying to "see" the effect of changing Encoding. (perhaps reversal of byte order for Integers ? )
I tried it on a CWF message set with a field of type Int (external decimal) but when I use ASBITSTREAM with ccsid 1208 and different encodings 273,546,785 the resulting BLOB is the same.
Could anyone either suggest an example wherein I can see the effect of changing encoding. Or some good material/links to read up.
I do not have access to a test mainframe/AIX Env for some time. Just a windows machine.
Thanks |
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| smdavies99 |
| Posted: Fri Nov 09, 2012 12:51 am Post subject: |
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Jedi Council
Joined: 10 Feb 2003
Posts: 6076
Location: Somewhere over the Rainbow this side of Never-never land.
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http://publib.boulder.ibm.com/infocenter/wmqv7/v7r0/topic/com.ibm.mq.csqzak.doc/fr13050_.htm
Then goto to the definition of 'Encoding'.
| Quote: |
The numeric encoding defines the representation used for binary integers, packed-decimal integers, and floating-point numbers.
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If you are dealing with EBCIDIC Data then getting the correct value matters a great deal especially for packed decimal types.
If you are dealing with textual data (eg XML) then it does not matter at all (AFAIK).
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Every time you reinvent the wheel the more square it gets (anon). If in doubt think and investigate before you ask silly questions. |
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| Karan |
| Posted: Fri Nov 09, 2012 1:13 am Post subject: |
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Apprentice
Joined: 21 Oct 2009
Posts: 29
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So if I have cobol data (with only PIC 9 , PIC X and PIC9 V99 i.e no packed decimal) coming as MQSTR then it doesent matter ?
The link talks abt binary integers , floating point numbers as well apart from packed decimal.
Im still looking to understand its concept and see how it makes a difference to the bitstream if anyone has an example. |
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| mqjeff |
| Posted: Fri Nov 09, 2012 3:52 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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Coded Character Set ID applies to data that is character data.
Encoding applies to data that is numeric data.
If you have a cobol record that only specifies PIC 9, PIC X and PIC9V9 or etc that always represents all numeric values using the characters 0-9, then Encoding doesn't apply.
If you have a cobol record that specifies numeric values should be represented as numbers, rather than the characters that represent numbers, then Encoding does apply. |
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| rekarm01 |
| Posted: Sun Nov 11, 2012 3:05 pm Post subject: Re: MQMD Encoding |
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Grand Master
Joined: 25 Jun 2008
Posts: 1415
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| Karan wrote: |
| Could anyone either suggest an example wherein I can see the effect of changing encoding. |
Here's a simple (untested) example:
| Code: |
DECLARE intValue INTEGER 42;
DECLARE blob273Value BLOB CAST(intValue AS BLOB ENCODING 273);
DECLARE blob546Value BLOB CAST(intValue AS BLOB ENCODING 546);
DECLARE blob785Value BLOB CAST(intValue AS BLOB ENCODING 785); |
The Encoding conversion is the same with MRM/CWF and ASBITSTREAM, but the CWF format needs to represent numeric data using actual numeric data types.
The MQMD Format should indicate which message bytes represent numeric data. |
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