Salesforce Advanced Administrator Certification Guide

Apex trigger anatomy

So far, we know that a trigger is defined by the following:

• An object type
• One or more events (before, after)
• A DML action (insert, update, delete, and undelete; upsert is just a short way to say do an insert or an update if the record already exists)

This is more or less the code involved in a trigger's definition:

1. trigger OpportunityTrigger on Opportunity (before insert, before update, 2. before delete, after insert, after update, 3. after delete, after undelete) {4.     //code goes here...5. }

All possible event combinations are referenced:

• Before events support insert, update, and delete operations.
• After events support insert, update, delete, and undelete operations.

If you want to refer to the specific event ...