Apex Developer Guide

Apex Developer Guide
Getting Started with Apex
Introducing Apex
What is Apex?
Understanding Apex Core Concepts
When Should I Use Apex?
How Does Apex Work?
Developing Code in the Cloud
What's New?
Apex Development Process
Apex Quick Start
Writing Apex
Running Apex
Debugging, Testing, and Deploying Apex
Apex Language Reference
Appendices
Glossary
PDF

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When Should I Use Apex?

The Salesforce prebuilt applications provide powerful CRM functionality. In addition, Salesforce provides the ability to customize the prebuilt applications to fit your organization. However, your organization may have complex business processes that are unsupported by the existing functionality. In this case, Lightning Platform provides various ways for advanced administrators and developers to build custom functionality.

Apex

Use Apex if you want to:
  • Create Web services.
  • Create email services.
  • Perform complex validation over multiple objects.
  • Create complex business processes that are not supported by workflow.
  • Create custom transactional logic (logic that occurs over the entire transaction, not just with a single record or object).
  • Attach custom logic to another operation, such as saving a record, so that it occurs whenever the operation is executed, regardless of whether it originates in the user interface, a Visualforce page, or from SOAP API.

Lightning Components

Develop Lightning components to customize Lightning Experience, the Salesforce app, or to build your own standalone apps. You can also use out-of-the-box components to speed up development.

As of Spring ’19 (API version 45.0), you can build Lightning components using two programming models: the Lightning Web Components model, and the original Aura Components model. Lightning web components are custom HTML elements built using HTML and modern JavaScript. Lightning web components and Aura components can coexist and interoperate on a page.Configure Lightning web components and Aura components to work in Lightning App Builder and Community Builder. Admins and end users don’t know which programming model was used to develop the components. To them, they’re simply Lightning components.

For more information, see the Component Library.

Visualforce

Visualforce consists of a tag-based markup language that gives developers a more powerful way of building applications and customizing the Salesforce user interface. With Visualforce you can:
  • Build wizards and other multistep processes.
  • Create your own custom flow control through an application.
  • Define navigation patterns and data-specific rules for optimal, efficient application interaction.

SOAP API

Use standard SOAP API calls if you want to add functionality to a composite application that processes only one type of record at a time and does not require any transactional control (such as setting a Savepoint or rolling back changes).