Introduction to Apex for Programmers March 27, 2014

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Speakers

Joshua

Birk Developer Evangelist @joshbirk

LeeAnne

Templeman Developer Evangelist @leeanndroid

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Introduction to Apex

§  What is Apex?

§  Developing in your browser

§  Apex Controllers

§  Apex Triggers

§  Other Apex Use Cases

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Declarative Apps

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Declarative and Programmatic

Declarative Programmatic

Visualforce Pages Visualforce Components

Apex Controllers Apex Triggers

Metadata API REST API Bulk API

Workflows Validation Rules

Approval Processes

Objects Fields

Relationships

Page Layouts Record Types

User Interface

Business Logic

Data Model

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Apex

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Introduction to Apex

Chapter 1:

§  Object-Oriented Language

§  Dot Notation Syntax

§  Developed, Compiled and Deployed in the Cloud

§  “First Class” Citizen on the Platform

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Every Object, Every Field: Apex and Visualforce Enabled

Visualforce Pages Visualforce Components

Apex Controllers Apex Triggers

Custom UI

Custom Logic

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Apex Class Structure

Chapter 1:

public with sharing class myControllerExtension implements Util { private final Account acct; public Contact newContact {get; set;} public myControllerExtension(ApexPages.StandardController stdController) { this.acct = (Account)stdController.getRecord(); } public PageReference associateNewContact(Id cid) { newContact = [SELECT Id, Account from Contact WHERE Id =: cid LIMIT 1]; newContact.Account = acct; update newContact; } }

Class and Interface based Scoped Variables Inline SOQL Inline DML

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Developer Console

•  Browser Based •  Create and Edit Classes •  Create and Edit Triggers •  Run Unit Tests •  Review Debug Logs

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Apex Controllers

•  Logic for User Interfaces

•  Custom Controllers or Extensions

•  Transport via:

•  Viewstate

•  JavaScript

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Interacting with Apex

Annotated Apex methods exposed to JavaScript

Visualforce Forms Visualforce component bound to an Apex Method

JavaScript Remoting

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Apex Triggers

§  Event Based Logic

§  Associated with Object Types

§  Before or After:

§  Insert

§  Update

§  Delete

§  Undelete

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Controlling Flow

trigger LineItemTrigger on Line_Item__c (before insert, before update) {

//separate before and after if(Trigger.isBefore) { //separate events if(Trigger.isInsert) {

System.debug(‘BEFORE INSERT’); DelegateClass.performLogic(Trigger.new);

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Controlling Flow

trigger LineItemTrigger on Line_Item__c (before insert, before update) {

//separate before and after if(Trigger.isBefore) { //separate events if(Trigger.isInsert) {

System.debug(‘BEFORE INSERT’); DelegateClass.performLogic(Trigger.new);

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Static Flags

public with sharing class AccUpdatesControl { // This class is used to set flag to prevent multiple calls public static boolean calledOnce = false; public static boolean ProdUpdateTrigger = false; }

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Chatter Triggers

trigger AddRegexTrigger on Blacklisted_Word__c (before insert, before update) { for (Blacklisted_Word__c f : trigger.new) { if(f.Custom_Expression__c != NULL) { f.Word__c = ''; f.Match_Whole_Words_Only__c = false; f.RegexValue__c = f.Custom_Expression__c; } } }

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Scheduled Apex

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Schedulable Interface

global with sharing class WarehouseUtil implements Schedulable { //General constructor global WarehouseUtil() {} //Scheduled execute global void execute(SchedulableContext ctx) { //Use static method for checking dated invoices WarehouseUtil.checkForDatedInvoices(); }

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Schedulable Interface System.schedule('testSchedule','0 0 13 * * ?',

new WarehouseUtil());

Via Apex

Via Web UI

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Batch Apex

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Batchable Interface global with sharing class WarehouseUtil

implements Database.Batchable<sObject> { //Batch execute interface global Database.QueryLocator start(Database.BatchableContext BC){ //Start on next context } global void execute(Database.BatchableContext BC,

List<sObject> scope) { //Execute on current scope } global void finish(Database.BatchableContext BC) { //Finish and clean up context } }

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Apex Endpoints

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Apex REST @RestResource(urlMapping='/CaseManagement/v1/*') global with sharing class CaseMgmtService { @HttpPost global static String attachPic(){ RestRequest req = RestContext.request; RestResponse res = Restcontext.response; Id caseId = req.requestURI.substring(req.requestURI.lastIndexOf('/')+1); Blob picture = req.requestBody; Attachment a = new Attachment (ParentId = caseId, Body = picture, ContentType = 'image/

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Unit Testing

•  Declare Classes/Code as Test •  isTest Annotation •  testmethod keyword

•  Default data scope is test only •  75% coverage required

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Governor Limits

•  System Level Limits

•  Examples include:

•  150 DML calls

•  10 callouts

•  More in the Apex Workbook

•  Chapter 3, Tutorial #13

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Bulkify Logic // For loop to iterate through all the queried Account records ! for(Account a: accountsWithContacts){! // Use the child relationships dot syntax to access the related Contacts! for(Contact c: a.Contacts){!

!contactsToUpdate.add(c);! } ! }! ! //Now outside the FOR Loop, perform a single Update DML statement. ! update contactsToUpdate; !!

http://wiki.developerforce.com/page/Apex_Code_Best_Practices

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Recap

§  What is Apex?

§  Developing in your browser

§  Apex Controllers

§  Apex Triggers

§  Other Apex Use Cases

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Resources

§  Your Developer Edition –  http://developer.force.com/join

§  Force.com Workbook –  http://developer.force.com/workbooks

§  Apex Workbook –  http://developer.force.com/workbooks

Q & A

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Joshua

Birk Developer Evangelist @joshbirk

LeeAnne

Templeman Developer Evangelist @leeanndroid