apex triggers chapter 90 salesforce developer masterclass

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certainly! in this tutorial, we will cover the basics of apex triggers, an essential part of the salesforce platform, particularly relevant for developers working with the salesforce ecosystem. we'll explore what triggers are, how to implement them, and best practices for using them effectively.

chapter 90: apex triggers

what is an apex trigger?

an apex trigger is a piece of code that executes before or after specific data manipulation language (dml) events occur on salesforce records, such as inserting, updating, deleting, or undeleting records. triggers allow developers to perform custom actions in response to these events.

types of triggers

1. **before triggers**: executes before a record is saved to the database. useful for validating or modifying values before they are committed.
2. **after triggers**: executes after a record has been saved to the database. suitable for actions that require the record to be committed, such as sending notifications or updating related records.

trigger syntax

the basic syntax of an apex trigger is as follows:



**triggername**: the name of your trigger.
**objectname**: the salesforce object that the trigger is working with (e.g., account, contact).
**trigger_events**: the events that will invoke the trigger (e.g., before insert, after update).

example: creating an apex trigger

let's create a simple trigger that updates a field on the `account` object whenever an account is updated.

scenario

suppose we want to update a custom field called `last_updated_by__c` on the `account` object to reflect the name of the user who last updated the account.

apex trigger code



explanation

**trigger.new**: contains the new versions of the records being processed.
**trigger.oldmap**: contains the old versions of the records as a map, allowing us to compare old and new values.
**userinfo.getname()**: this method retrieves the name of the current user executing the trigger.

best practices for writing triggers

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Apex triggers
Salesforce developer
masterclass
event-driven programming
Salesforce automation
trigger context variables
bulk processing
governor limits
database operations
trigger best practices
Apex code
Salesforce platform
data integrity
trigger frameworks
asynchronous processing