• 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
    Raz-Lee Security

    iSecurity Multi Factor Authentication (MFA) helps organizations meet compliance standards and improve the existing security environment on IBM i. It requires a user to verify his identity with two or more credentials.

    Key Features:

    • iSecurity provides Multi Factor Authentication as part of the user’s initial program
    • Works with every Authenticator App available in the Market.

    Contact us at https://www.razlee.com/isecurity-multi-factor-authentication/

    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

  • IBM i Has a Future ‘If Kept Up To Date,’ IDC Says
  • When You Need Us, We Are Ready To Do Grunt Work
  • Generative AI: Coming to an ERP Near You
  • Four Hundred Monitor, March 22
  • IBM i PTF Guide, Volume 25, Number 12
  • Unattended IBM i Operations Continue Upward Climb
  • VS Code Is The Full Stack IDE For IBM i
  • Domino Runs on IBM i 7.5, But HCL Still Working on Power10
  • Four Hundred Monitor, March 6
  • IBM i PTF Guide, Volume 25, Number 11

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 © 2023 IT Jungle