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Programming Microsoft Dynamics 365 Business Central

You're reading from   Programming Microsoft Dynamics 365 Business Central Build customized business applications with the latest tools in Dynamics 365 Business Central

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Product type Paperback
Published in Apr 2019
Publisher Packt
ISBN-13 9781789137798
Length 536 pages
Edition 6th Edition
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Authors (3):
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Christopher D. Studebaker Christopher D. Studebaker
Author Profile Icon Christopher D. Studebaker
Christopher D. Studebaker
David Studebaker David Studebaker
Author Profile Icon David Studebaker
David Studebaker
Marije Brummel Marije Brummel
Author Profile Icon Marije Brummel
Marije Brummel
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Table of Contents (12) Chapters Close

Preface 1. Introduction to Business Central FREE CHAPTER 2. Tables 3. Data Types and Fields 4. Pages - The Interactive Interface 5. Queries and Reports 6. Introduction to AL 7. Intermediate AL 8. Advanced AL Development Tools 9. Successful Conclusions 10. Assessments 11. Other Books You May Enjoy

Table triggers

To display the triggers with the table open in Visual Studio Code, enter the trigger keyword in the first line after the fields section, followed by Ctrl + spacebar. This is shown in the following screenshot:

The code contained in trigger is executed prior to the event represented by trigger. In other words, the code in the OnInsert() trigger is executed before the record is inserted into the table. This allows the developer a final opportunity to perform validations and to enforce data consistency such as referential integrity. We can even abort the intended action if data inconsistencies or conflicts are found.

These triggers are automatically invoked when record processing occurs as the result of user action. But when table data is changed by AL code or by a data import, the AL code or import process determines whether or not the code in the applicable trigger is executed:

  • OnInsert(): This is executed when a new record is to be inserted in...
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