• The Four Hundred
  • Subscribe
  • Media Kit
  • Contributors
  • About Us
  • Contact
Menu
  • The Four Hundred
  • Subscribe
  • Media Kit
  • Contributors
  • About Us
  • Contact
  • Handling Constraints Revisited

    March 31, 2015 Paul Tuohy

    I recently had an email from Doug, who was making use of some code I had published way back in February 2010 in my article Handling Constraint Violations in RPG. The article discussed how to trap a constraint violation caused by a WRITE/UPDATE/DELETE operation and, more importantly, how to determine the name of the constraint that caused the violation.

    Doug had come up with an instance where my code was not working! After going through the usual stages of denial, anger, and some expensive therapy, I read the rest of the email. Doug’s code worked fine with an RPG

    …

    Read more
  • Handling Constraint Violations in RPG

    February 17, 2010 Paul Tuohy

    Constraints have been around for a long time but have not quite made it into every programmer’s tool kit. This is partly explained by the fact that implementing constraints in an existing application can be tricky–but it doesn’t explain why constraints are not used extensively in new applications.

    On a side note, the lack of constraints on a database is one of the reasons I have heard why data should be moved/copied from the i to other database servers, such as SQL server and Oracle, for such things as data warehousing. To a “pure database person,” a lack of constraints

    …

    Read more

Next Articles

Content archive

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

Recent Posts

  • 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
  • Liam Allan Shares What’s Coming Next With Code For IBM i
  • From Stable To Scalable: Visual LANSA 16 Powers IBM i Growth – Launching July 8
  • VS Code Will Be The Heart Of The Modern IBM i Platform
  • The AS/400: A 37-Year-Old Dog That Loves To Learn New Tricks
  • IBM i PTF Guide, Volume 27, Number 25

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