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MQSeries.net Forum IndexWebSphere Message Broker SupportDFDL Parser Issue with Trimming Zeros.

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muthu121521
PostPosted: Wed May 29, 2019 1:48 pm Post subject: DFDL Parser Issue with Trimming Zeros. Reply with quote

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Joined: 31 Aug 2015
Posts: 23

We are getting the COBOL copybook response , which is a packed decimal 9 byte.
Lets say if that binary packed decimal is 000091184,We are getting only 91184, all of the leading zero's are trimmed, how do we prevent trimming the leading zeros, What re the additional settings we can do at the element level to prevent it from occurring ?
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timber
PostPosted: Thu May 30, 2019 2:05 am Post subject: Reply with quote

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Joined: 25 Aug 2015
Posts: 984

The value of the field is 91184 (a number)
The physical format of the field in the input message is '000091184' (a string of characters)
The message tree contains the parsed value of the field, which is a number.
Quote:
We are getting only 91184, all of the leading zero's are trimmed, how do we prevent trimming the leading zeros, What re the additional settings we can do at the element level to prevent it from occurring ?
Why do you want the leading zeros? They are not part of the value of the element. I think I can guess what your answer will be, but I might be wrong. Please explain the scenario.
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muthu121521
PostPosted: Thu May 30, 2019 4:58 am Post subject: Reply with quote

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Joined: 31 Aug 2015
Posts: 23

Hi Timber,

Thanks For your Response, Its actually a Timefield in the format of HHmmssSS, if the zeros are discarded i am not able to set the response correctly.
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Vitor
PostPosted: Thu May 30, 2019 4:58 am Post subject: Reply with quote

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Joined: 11 Nov 2005
Posts: 25671
Location: Ohio, USA

timber wrote:
The physical format of the field in the input message is '000091184' (a string of characters)


With respect:

muthu121521 wrote:
Lets say if that binary packed decimal is 000091184


So it's a string of bytes with a digit in each nibble (probably described in the COBOL copybook as S9(9) COMP-3.

However:

timber wrote:
The message tree contains the parsed value of the field, which is a number.




timber wrote:
Why do you want the leading zeros? They are not part of the value of the element. I think I can guess what your answer will be, but I might be wrong. Please explain the scenario.




I would also point out that if you asked the COBOL program sending the response what the value of that field was, it would tell you it was 91184 not "0000091184" because the field definition is S9(9) COMP-3 not 9(9). Exactly how the DFDL parser is describing it.

So explain why you need the character value in the message tree
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Vitor
PostPosted: Thu May 30, 2019 5:00 am Post subject: Reply with quote

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Joined: 11 Nov 2005
Posts: 25671
Location: Ohio, USA

muthu121521 wrote:
Its actually a Timefield in the format of HHmmssSS, if the zeros are discarded i am not able to set the response correctly.


So why isn't it described in the DFDL model as a time field?
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muthu121521
PostPosted: Thu May 30, 2019 5:06 am Post subject: Reply with quote

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We got the response copybook from the mainframe team as element name as below

15 elementxxxx PIC S9(09) COMP-3. 00179700
* ** FORMAT = 0HHMMSSTH ** 00179800

even then we are getting the leading zeros's trimmed
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Vitor
PostPosted: Thu May 30, 2019 5:22 am Post subject: Reply with quote

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Joined: 11 Nov 2005
Posts: 25671
Location: Ohio, USA

muthu121521 wrote:
We got the response copybook from the mainframe team as element name as below

15 elementxxxx PIC S9(09) COMP-3. 00179700
* ** FORMAT = 0HHMMSSTH ** 00179800

even then we are getting the leading zeros's trimmed


Well pardon my astonishment :sarcasm emoji:

Notice the '*' before the e of 'element'? That's how COBOL indicates a comment. So the programmer has helpfully documented that the field value contains a time stamp, and is to be congratulated for doing so.

It's still a number. COBOL thinks it's a number, so any DFDL model built from that definition will think it's a number. For the record, COBOL doesn't have a data type for time stamp, hence the use of a COMP-3 to hold this.

If you want this parsed as a time stamp, you'll have to explain to DFDL that it's a time stamp.
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timber
PostPosted: Thu May 30, 2019 1:21 pm Post subject: Reply with quote

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Joined: 25 Aug 2015
Posts: 984

Quote:
if the zeros are discarded i am not able to set the response correctly.
I do not understand that statement. What is the format of the response? If it is another COBOL copybook, then surely you can just put the number value from the message tree into OutputRoot.DFDL and DFDL will put the leading zeroes in when it writes the output message.

Please
a) describe the output format that you need
and
b) explain what happens (in the output message, not in the message tree) when you do what I suggest above.
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