Curriculum
Apex Triggers are pieces of Apex code that execute automatically when specific events occur on Salesforce records. Triggers enable developers to perform custom actions before or after records are inserted, updated, deleted, or restored. They are one of the most powerful automation tools available in Salesforce and are widely used in enterprise applications.
Triggers help organizations automate business processes, enforce business rules, maintain data integrity, update related records, and implement complex logic that cannot be achieved through standard Salesforce automation tools alone.
Understanding Trigger Basics is essential for Salesforce Developers because Apex Triggers are a core component of Salesforce application development.
An Apex Trigger is Apex code that executes automatically when data changes occur in Salesforce.
Triggers respond to events such as:
Triggers run automatically without user intervention.
Businesses often require custom automation.
Examples:
Apex Triggers help implement these requirements.
Automate repetitive tasks.
Enforce business rules.
Maintain accurate records.
Reduce manual work.
Support advanced requirements.
These benefits make Triggers extremely valuable.
When a user performs an action on a record:
Salesforce can automatically execute a Trigger.
Scenario:
A new Student record is created.
Process:
Create Student Record
↓
Trigger Executes
↓
Business Logic Runs
↓
Record SavedAutomation occurs automatically.
trigger StudentTrigger
on Student__c
(before insert) {
}Components:
StudentTriggerStudent__cbefore insertThis defines when the Trigger executes.
Example:
trigger AccountTrigger
on Account
(before insert) {
}Meaning:
Execute before
an Account record
is inserted.This is a simple Trigger definition.
Triggers execute on specific events.
Salesforce supports:
These events determine when logic executes.
Before Triggers execute before records are saved to the database.
Common Uses:
Example:
trigger StudentTrigger
on Student__c
(before insert) {
}The record has not yet been saved.
After Triggers execute after records are committed to the database.
Common Uses:
Example:
trigger StudentTrigger
on Student__c
(after insert) {
}The record already exists in Salesforce.
Runs before new records are saved.
Example Use:
Set Default ValuesRuns before existing records are updated.
Example Use:
Validate ChangesRuns before records are deleted.
Example Use:
Prevent DeletionRuns after records are created.
Example Use:
Create Related RecordsRuns after records are modified.
Example Use:
Update Related ObjectsRuns after records are removed.
Example Use:
Maintain Audit DataRuns after records are restored.
Example Use:
Restore Related Informationtrigger StudentTrigger
on Student__c
(after insert) {
System.debug(
'Student Created'
);
}Whenever a Student record is created:
Student Createdappears in debug logs.
This demonstrates basic Trigger execution.
Triggers can run on standard objects.
Example:
trigger AccountTrigger
on Account
(before insert) {
}Supported Objects:
Triggers work with both standard and custom objects.
Example:
trigger StudentTrigger
on Student__c
(before insert) {
}Custom objects behave exactly like standard objects.
A single Trigger can support multiple events.
Example:
trigger StudentTrigger
on Student__c
(
before insert,
before update
) {
}This Trigger executes for:
Multiple events improve code organization.
Triggers execute within a context.
Examples:
The context determines available data and operations.
Example:
User Saves Record
↓
Validation Rules
↓
Before Trigger
↓
Database Save
↓
After Trigger
↓
Commit TransactionUnderstanding execution flow is important for development.
Business Requirement:
Every Student should have a default status.
Trigger:
trigger StudentTrigger
on Student__c
(before insert) {
for(Student__c student :
Trigger.new){
student.Status__c =
'Active';
}
}The field is automatically populated.
Input:
Student Name:
Rahul SharmaOutput:
Status:
ActiveAutomation occurs before saving.
Business Requirement:
Create an Enrollment record when a Student is created.
Trigger:
trigger StudentTrigger
on Student__c
(after insert) {
List<Enrollment__c>
enrollments =
new List<Enrollment__c>();
for(Student__c student :
Trigger.new){
enrollments.add(
new Enrollment__c(
Student__c =
student.Id
)
);
}
insert enrollments;
}This is a common After Trigger use case.
Organizations use Triggers for:
Triggers are widely used across Salesforce projects.
These advantages make Triggers powerful development tools.
Triggers must comply with:
Developers must design Triggers carefully.
Improve maintainability.
Separate business logic.
Handle multiple records efficiently.
Prevent Governor Limit issues.
Improve performance.
These practices support scalable development.
Developers should avoid these mistakes.
A software training company wants:
Triggers automate these processes whenever Student records are created or updated.
This reduces manual work and improves data consistency.
Understanding Trigger Basics helps professionals:
Triggers are a fundamental Salesforce development skill.
Apex Triggers are automatic pieces of Apex code that execute when records are inserted, updated, deleted, or restored. Through Before Triggers, After Triggers, Trigger Events, and custom business logic, developers can automate processes, maintain data integrity, and build powerful Salesforce applications. Understanding Trigger Basics is the foundation for mastering Salesforce automation and enterprise application development.
An Apex Trigger is code that executes automatically when Salesforce records change.
Insert, Update, Delete, and Undelete events.
A Before Trigger executes before records are saved.
An After Trigger executes after records are committed to the database.
Yes. Triggers support both standard and custom Salesforce objects.
Triggers automate business processes and enforce custom business logic.
Looking to learn more technologies and programming skills?