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Understanding Triggers: Setup, Examples, and Tips in Unidata

Explore the world of triggers in Unidata with Jeff Butera and Pieter Crow. This session covers what triggers are, their capabilities, and how to effectively set them up. Learn about various trigger examples, from cleaning up HTML in course descriptions to validating data entry. Gain tips and tricks for automating processes and utilizing computed columns. Join us to uncover the essential techniques for leveraging triggers to enhance your data management. Perfect for anyone looking to improve their Unibasic applications!

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Understanding Triggers: Setup, Examples, and Tips in Unidata

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Presentation Transcript

  1. Session 4718 Triggers Unlimited National Harbor 6 & 7 Tuesday 4/07/2009 3:45pm Jeff Butera -- Hampshire College Pieter Crow -- Central Wyoming College

  2. Outline • What is a trigger? • What can triggers do? • How do you setup triggers? • Trigger examples • Tips and tricks • Questions

  3. What is a trigger? • Piece of executed code • Triggered by certain events Unidata specifics: • Code is a Unibasic subroutine or function • Trigger can be invoked when a record is • Created • Modified (written) • Deleted

  4. What can triggers do? Triggers are useful for automated processing • ADDOPR, CHGOPR • Virtual fields too slow? • No problem, make ‘em computed with a trigger • Stored computed columns • Status and/or status date fields • Notify (email?) when certain things happen

  5. How do you setup triggers? • Create subroutine with 5 arguments: EXECSTAT out (0,1,2) DICT.FLAG in (“”,“DICT”) FILENAME in (“STUDENTS”) ID in (“0023450”) RECORD in/out • Compile and GLOBALLY catalog • CREATE.TRIGGER FILENAME SUBNAME UPDATE

  6. Trigger examples at Hampshire • Find bad HTML in course descriptions • Edit A/R to NOT show dorm assignment • FMLA check on complete timecard • Log deletes, cleanup pointers • Auto assign ID Card type (& export) • Validate data entered • Stored computed columns (realtime)

  7. Jeff’s tips and tricks * cleanup some simple HTML SWAP '<p>' WITH '<P>' IN X.DESC SWAP '</p>' WITH '</P>' IN X.DESC SWAP '<br>' WITH '<BR/>' IN X.DESC SWAP '<BR>' WITH '<BR/>' IN X.DESC SWAP '<hr>' WITH '<HR/>' IN X.DESC SWAP '<HR>' WITH '<HR/>' IN X.DESC SWAP '</a>' WITH '</A>' IN X.DESC SWAP '<a href' WITH '<A HREF' IN X.DESC SWAP '<a HREF' WITH '<A HREF' IN X.DESC * Strip out some bad binary multibyte chars CALL H08.IC.S.FIX.BAD.ASCII.CHARS(X.DESC)

  8. Trigger examples at Central Wyoming

  9. Pieter’s tips and tricks

  10. More information • Unidata documentation (a little thin): • Developing Unibasic Applications Chapter 4 – Maintaining Data in Files Section on database triggers

  11. Questions Jeff Butera jeff@hampshire.edu http://jeff.hampshire.edu Pieter Crow pcrow@cwc.edu

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