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September 22, 2017

Importing CSV Text Into COBOL II

CSV iconI'm importing a Comma Separated Value (CSV) text file into a COBOL II program. I want to compare a numeric field from the file to a number. But the input text field can be different for each record. How do I code in COBOL to accommodate the different number sizes in the text file?

Walter Murray, who worked inside HP's Language Labs where COBOL II was developed before moving out into the user community, noted that Suprtool was likely the best solution to the problem. But after someone suggested that COBOL's UNSTRING statement could be useful, he had his doubts. 

Along with suggesting that "importing the file into an Excel spreadsheet, and saving it in a more civilized format," Murray had these notes.

The UNSTRING statement will be problematic, because one of your fields may have one (or more?) commas in it, and you may have an empty field not surrounded by quotation marks. You might have to roll your own code to break the record into fields.  If you are comfortable with reference modification in COBOL, your code will be a lot cleaner.

Once you do isolate the check amount in a data item by itself, you should be able to use FUNCTION NUMVAL-C to convert it.  Yes, NUMVAL and NUMVAL-C are supported by COBOL II/iX, as long as you turn on the POST85 option.

Olav Kappert offered a long but consistent process.

First thing to do is to not use CVS; use tab-delimited. No problem with UNSTRING. Just use the length field and determine if the length = 0.

Do an UNSTRING of the fields delimited by the tab. Then strip out the quotes. Determine the length of each field and right-justify each field and zero-fill them with a leading zero. Then move the field to a numeric field.

You now have your values. Do this for each field from the unstring. You can create a loop and keep finding the ",".  By the way, determine the record length and set the last byte+1 to "~" so that the unstring can determine the end of record. Long process, but consistent in method.

In addition to generating a CSV file with leading zeroes, Alan Yeo suggested using the X field.

Move the CSV value to a full size X field, then strip trailing spaces, and then move the result to an X redefines of your numeric. Please note, as your numeric is V99, you might also want to strip all "." and "," before the compare.

Dave Powell offered up a general purpose, bullet-proof COBOL program to accomplish the task, fully referenced at the 3000-L newsgroup archive. The entire discussion of the mission is also online at the archives.



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