What is trigger handler Salesforce?
Apex trigger handler is an apex class to handle complexity in trigger logic set. It is used to provide a better way of writing complex logic that’s required for trigger code and also avoid creating more than one trigger per object.
What are trigger patterns in Salesforce?
Trigger Handler Pattern
- Apex Class that handles trigger logic.
- Allows code to be called from other code or tests.
- Uses specific Trigger contexts and Trigger variables for routing.
- Keep Triggers Simple.
- Allow for greater flexibility.
- Make code reusable.
- Unit tests are much easier.
What is Apex trigger framework?
Apex triggers enable you to perform custom actions before or after changes to Salesforce records, such as insertions, updates, or deletions. A trigger is Apex code that executes before or after the following types of operations: insert. update. delete.
Why do we use triggers in Salesforce?
A trigger is an Apex script that executes before or after data manipulation language (DML) events occur. Apex triggers enable you to perform custom actions before or after events to record in Salesforce, such as insertions, updates, or deletions.
How do I use triggers in Salesforce?
Get Started with Apex Triggers
- Write a trigger for a Salesforce object.
- Use trigger context variables.
- Call a class method from a trigger.
- Use the sObject addError() method in a trigger to restrict save operations.
What is trigger and types of trigger in Salesforce?
There are two types of triggers. Before triggers are used to update or validate record values before they’re saved to the database. After triggers are used to access field values that are set by the system (such as a record’s Id or LastModifiedDate field), and to affect changes in other records.
What is the difference between before trigger and after trigger?
Before Trigger is a type of trigger that automatically executes before a certain operation occurs on the table. In contrast, after trigger is a type of trigger that automatically executes after a certain operation occurs on the table.
What is the difference between before and after trigger?
How to create a trigger handler in Salesforce?
To create a trigger handler, you simply need to create a class that inherits from TriggerHandler.cls. Here is an example for creating an Opportunity trigger handler. In your trigger handler, to add logic to any of the trigger contexts, you only need to override them in your trigger handler.
Is there a pattern for trigger handlers in apex?
The Apex Trigger template above calls a handler class to execute the trigger logic, the trigger handler class should be defined as follows: There’s no defined pattern as such but it is always considered as a best practice to have all your trigger logic inside one handler class and only have one trigger on each object.
Can a trigger handler be attached to multiple objects?
The Force.com platform supports attaching any number of triggers to an object, but there is no guaranteed order of execution, and multiple trigger instances often query the same set of data, which can cause performance and governor headaches.
What’s the best way to delegate trigger handling?
To avoid these problems, and others, an accepted best practice is to delegate trigger handling to a second class, so that there is one trigger handler per object.
