• The Four Hundred
  • Subscribe
  • Media Kit
  • Contributors
  • About Us
  • Contact
Menu
  • The Four Hundred
  • Subscribe
  • Media Kit
  • Contributors
  • About Us
  • Contact
  • Control Break Programs, Version 3

    August 11, 2004 Dear Readers

    Faithful reader Doug Eckersley sent me an example of how he would write a control break program like the one I presented in the May 12 issue. Doug mentions two things he likes about his method. First, it uses subroutines, which makes the program modular, and, second, he uses no hold fields. Here’s his code.

    D K1              C                   1
    D K2              C                   2
    D K3              C                   3
    D Key           E DS                  extname(SALES:*key)
    
         Begsr $Main;
    
           NewPage = *on;
           CompanyTotal = 0;
           Except REPORTHEADER;
           Setll *start SALES;
           Read SALES;  
                     
           Dow not %eof(SALES);    
              Exsr $Level1;    
              Read SALES;
           Enddo;
           
           Except REPORTFOOTER;
    
         Endsr;
         
         Begsr $Level1;
    
           // Store
           StoreTotal = 0;  
           Except STOREHDR;   
           
           Dow not %eof(SALES);
              Exsr $Level2;
              Reade %kds(Key:K1) SALES;
           Enddo; 
           
           Except STOREFOOTER;
           CompanyTotal += StoreTotal;
           Setgt %kds(Key:K1) SALES;
    
         Endsr;
         
         Begsr $Level2
    
            // Department  
            DepartmentTotal = 0;  
            Except DEPTHDR;
         
            Dow not %eof(SALES);
               Exsr $Level3;
               Reade %kds(Key:K2) SALES;
            Enddo; 
         
            Except DEPTFOOTER;
            StoreTotal += DepartmentTotal;
            Setgt %kds(Key:K2) SALES;
    
         Endsr; 
         
         Begsr $Level3;
    
            // SalesPerson  
            SalesPersonTotal = 0;
            Except SPHDR;
         
            Dow not %eof(SALES);
              Exsr $Detail;
              Reade %kds(Key:K3) SALES;
            Enddo;
         
            Except SPFOOTER;
            DepartmentTotal += SalesPersonTotal;
            Setgt %kds(Key:K3) SALES;
    
         Endsr;
         
         Begsr $Detail;
    
            Exsr $NewPage
            Except DETAIL;
            SalesPersonTotal += SaleAmount;
    
         Endsr;
         

    I’d like to add an observation or three. It’s true that Doug’s method doesn’t require hold fields, but it does require random I/O (that is, SETGT), which may hamper performance. The fact that Doug uses a keyed file means that he has to have an access path over the data, at least at compile time. Also, this method doesn’t work with embedded SQL.

    But I sound more critical than I mean to be. Both Doug and Mike (in the July 28 issue) have presented techniques that are well thought out, and I am grateful to have learned other ways to handle a common task.

    –Ted

    Share this:

    • Reddit
    • Facebook
    • LinkedIn
    • Twitter
    • Email

    Tags:

    Sponsored by
    WorksRight Software

    Do you need area code information?
    Do you need ZIP Code information?
    Do you need ZIP+4 information?
    Do you need city name information?
    Do you need county information?
    Do you need a nearest dealer locator system?

    We can HELP! We have affordable AS/400 software and data to do all of the above. Whether you need a simple city name retrieval system or a sophisticated CASS postal coding system, we have it for you!

    The ZIP/CITY system is based on 5-digit ZIP Codes. You can retrieve city names, state names, county names, area codes, time zones, latitude, longitude, and more just by knowing the ZIP Code. We supply information on all the latest area code changes. A nearest dealer locator function is also included. ZIP/CITY includes software, data, monthly updates, and unlimited support. The cost is $495 per year.

    PER/ZIP4 is a sophisticated CASS certified postal coding system for assigning ZIP Codes, ZIP+4, carrier route, and delivery point codes. PER/ZIP4 also provides county names and FIPS codes. PER/ZIP4 can be used interactively, in batch, and with callable programs. PER/ZIP4 includes software, data, monthly updates, and unlimited support. The cost is $3,900 for the first year, and $1,950 for renewal.

    Just call us and we’ll arrange for 30 days FREE use of either ZIP/CITY or PER/ZIP4.

    WorksRight Software, Inc.
    Phone: 601-856-8337
    Fax: 601-856-9432
    Email: software@worksright.com
    Website: www.worksright.com

    Share this:

    • Reddit
    • Facebook
    • LinkedIn
    • Twitter
    • Email

    Califon Systems Ships New Release of OS/400 Security Module Fast400 Founder Sues Big Blue

    Leave a Reply Cancel reply

Content archive

  • The Four Hundred
  • Four Hundred Stuff
  • Four Hundred Guru

Recent Posts

  • To Comfort The Afflicted And Afflict The Comfortable
  • How FalconStor Is Reinventing Itself, And Why IBM Noticed
  • Guru: When Procedure Driven RPG Really Works
  • Vendors Fill In The Gaps With IBM’s New MFA Solution
  • IBM i PTF Guide, Volume 27, Number 27
  • With Power11, Power Systems “Go To Eleven”
  • With Subscription Price, IBM i P20 And P30 Tiers Get Bigger Bundles
  • Izzi Buys CNX, Eyes Valence Port To System Z
  • IBM i Shops “Attacking” Security Concerns, Study Shows
  • IBM i PTF Guide, Volume 27, Number 26

Subscribe

To get news from IT Jungle sent to your inbox every week, subscribe to our newsletter.

Pages

  • About Us
  • Contact
  • Contributors
  • Four Hundred Monitor
  • IBM i PTF Guide
  • Media Kit
  • Subscribe

Search

Copyright © 2025 IT Jungle