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| MultiPart Message (COBOL Copy book) |
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| rsashi |
 Posted: Thu Oct 23, 2008 10:13 am Post subject: MultiPart Message (COBOL Copy book) |
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Apprentice
Joined: 29 Jan 2004
Posts: 35
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Hi,
I am dealing with COBOL copy book.I get a large file with data which needs to be parsed and mapped only for few output elements.I'm hoping someone can help me in designing right way .
If we open the file , data will be structured like this:
- common header/envelope - fixed length (Only one header record)
- Data record - fixed length: (multiple records)
- Trailer record - fixed length : (Only one trailer record)
I am planning of using File nodes to deal with files.I need Your valuable responses for below questions,
1. Do i need to create multiple message sets. (One for header, one for data and one for Trailer) ?
2. How to identify the type of record in message flow.(Header or Data or Trailer)?
3. When i import COBOL book into message set...do i need to select CWF as Binary.(Data willcome from Main frame system) .
4. What will be the right design for my requirements ?
Your valuable thoughts are much appreciated.
Thanks |
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| rsashi |
| Posted: Fri Oct 24, 2008 8:18 am Post subject: |
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Apprentice
Joined: 29 Jan 2004
Posts: 35
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Let me know if the information i have provided is not clear.(Sorry)....let me know i can responde back with more details.Need your input's....its kind off urgent.
Thanks. |
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| kimbert |
| Posted: Thu Oct 30, 2008 4:26 am Post subject: |
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Jedi Council
Joined: 29 Jul 2003
Posts: 5542
Location: Southampton
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| Quote: |
| 1. Do i need to create multiple message sets. (One for header, one for data and one for Trailer) ? |
No, a single message set is fine. Just import your COBOL copybooks and you should end up with one message ( in the import wizard, make sure that you specify which element to define as a message). Afterwards, if you examine the message, its top-level structure should be header/body/trailer.
| Quote: |
| 2. How to identify the type of record in message flow.(Header or Data or Trailer)? |
The message tree will contains the name of the parsed element. But your message flow logic should be designed to expect a header, then a repeating body, then a trailer, as explained in my answer to question 4 below.
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| 3. When i import COBOL book into message set...do i need to select CWF as Binary.(Data willcome from Main frame system) . |
Yes, CWF is the correct physical format.
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| 4. What will be the right design for my requirements ? |
If the file did not have the header/trailer, then I would advise using the Parsed Record Sequence feature of the FileInput node. But you cannot use it when your file has headers/trailers.
Instead, you need to do this:
- In the FileInput node, set Parse Timing to 'On Demand'
- Use the techniques outlined here for handling large messages: http://www-128.ibm.com/developerworks/websphere/library/techarticles/0505_storey/0505_storey.html
The FileInput node is smart enough not to read the entire file into memory all at once. Instead, it will stream portions of the file into memory as they are needed. |
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| mqpaul |
| Posted: Tue Nov 04, 2008 3:49 am Post subject: Typical CCSID and Encoding for mainframes. |
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Acolyte
Joined: 14 Jan 2008
Posts: 66
Location: Hursley, UK
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You probably already know this, so for the record, typical mainframe CCSIDs are 037 and 500 (both variations of EBCDIC), or a national language EBCDIC (which I can never remember  ) if you need accented characters or currency symbols.
Typical mainframe Encoding is 785 (Big-endian with S390 floating point).
Broker defaults are for the machine where the broker runs. If that's on a distributed box and not the mainframe, you get ASCII CCSIDs and different encoding.
You need to specify the correct values on the FileInput node's Input message parsing panel.
_________________
Paul |
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