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Apex Code

Force.com Apex Code is a strongly-typed programming language that executes on the Force.com platform. Apex is used to add business logic to applications, to write database triggers, and to program controllers in the user interface layer. It has a tight integration with the database and query language, good web services support, and includes features such as futures and governors for execution in a multi-tenant environment.

Overview of Apex Code

An Introduction to Apex Code: A technical introduction to the Apex programming language, looking at its syntax, features, and use on the Force.com Platform.

Apex Code: The World's First On-Demand Programming Language: Whitepaper that provides an overview of the capabilities and technology of Apex.

Introduction to Apex : Recorded presentation of the Apex code overview.

Other Articles

How to Write Good Unit Tests

Apex Code Best Practices

Governors in Apex Code

An Introduction to Apex Code Test Methods

Security Tips for Apex and Visualforce Developers

Official Documentation

Force.com Apex Code Developer's Guide

Version 17.0 for Winter '10: HTML | PDF | Governor Limits | Earlier Versions

(Audience: Developers) Reference for Apex, a Java-like programming language that allows you to add custom logic to your apps.

Apex Quick Start Tutorial

Basic Tutorial | Advanced Tutorial

(Audience: Developers) A quick start tutorial introduction to the Apex programming language.

Presentations

Apex Deep Dive: Advanced Apex Techniques: Recorded at Dreamforce '08, this presentation looks at using Apex to developer Email services, dynamic Apex and asynchronous Apex.

Apex Test Coverage Best Practices: Recorded at Dreamforce '08, this presentation examines Apex test coverage and how it impacts how the deployment of high-quality apps on the Force.com Platform.

Apex Code Demo: Recorded demo of a few apps created with Apex

Getting Started with Apex Code: Introduction to Apex Code from Dreamforce '07.

Calling Web Services from Force.com (formerly Force.com SOA): Recorded demo highlighting the capabilities of Force.com for calling external Web services.

Code samples

The following code comes straight from the free Force.com Cookbook.

Avoiding runtime governor limits

Avoiding runtime governor limits - alternative

Avoiding runtime governor limits - alternative 2

Avoiding runtime governor limits - inefficient alternative

This is a helper class called by line 17 & 18

Avoiding runtime governor limits - alternative 3

Preventing duplicate lead entry, using maps

Tester application for lead de-deduplicator

Correlating query results with maps

Controlling recursive triggers with member variables

This one should be linked to the one above - it is a sub-taks

Tester application for recursive trigger

Hello World' application defined as a web service

S-control that calls the web service.

Apex class to determine test coverage.

Trigger that calls class method

Class called by trigger in 38.

Trigger to create new records

Trigger to update data in child records

Populate values in child record from parent record

Web service called from a pushbutton

Pushbutton that calls a Web service

Pushbutton to delete multiple records

Pushbutton to update multiple records

Template for a custom help s-control

Reading a parameter in an s-control

Passing a parameter to an s-control

Redirecting a User to an Edit, Detail, or List Page

Trigger to update multiple records (part of a solution to receive email updates every time a record changes)

S-control to format currency (part of roll-up summary field for different types of opportunities)

S-control snippet (part of roll-up summary field for different types of opportunities)

S-control to display data from a related record on a detail page

Other Code Samples

Force.com Email Services - Create tasks from Emails

Unsubscribe from emails with Email Services