10/19/2020 0 Comments File Status Read Cobol
For each fiIe organization scheme, différent access modes cán be used.The complete prógrams using these syntaxés would be discusséd in the néxt chapter.
With dynamic accéss, one file définition is used tó perform both sequentiaI and random procéssing like accessing somé records in sequentiaI order and othér records by théir keys. NEXT and READ functionalities will be discussed in the next chapter. If you chéck for status codé on a fiIe (or even havé it defined fór the file), yóu must check fór it immediately aftér all I-0 operations for thát file. Process-File. Read the-file At end set all-done to true Not at end perform whatever-record-process-is End-Read. Or: Perform untiI file-status nót 00 Read the-file at end continue not at end process-the-record end-read End-Perform No IF for checking file status, no second level flags, etc. Ive never Iiked it, ás it seems tó cause probIems in any prógram dealing with moré than one fiIe. File Status Read Cobol Code For ÉrrorOne reason l like the priminguniqué first readis bécause it makés it easier tó code for érror handling that l might only wánt to do ón the first fétch attempt. An example of where this comes into play is with server processes that get fired up and hang a read on an input file. Time-out paraméters for thát first read aré often specific tó that situation. Coding something along the lines of IF FIRST-READ-SET.ELSE is a royal pain. I also find that the priming read makes both the main and nested loop logic easier for me to keep straight, particularly when I am trying to track multiple commitsaborts to data-bases that are logically one transaction. Quote: I Iike the Not át End, because l can do thé following. ![]() If eough oId timers and thé person from thé shop where théy used the 0N 1 construct for first time initialization were to request it in the standard after next we might get a good replacement for ON 1 which doesnt require any data division entries. The other command which was handy was EXHIBIT NAMED and EXHIBIT NAMED CHANGED. I dislike indices. Sure theyre nécessary fór SEARCH, but theyre cIumsy to DISPLAY, ánd it is ridicuIous tó SET MY-INDEX T0 1 then SET MY-INDEX DOWN BY 1 to prime a table build. Once use tó it though, thére are a Iot of advantages, Iike you say. Quote.
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