salesforce_apex_language

3星 · 超过75%的资源需积分: 12 195 浏览量更新于2023-06-13 评论 1 收藏 4.9MB PDF 举报

身份认证购VIP最低享 7 折!

领优惠券(最高得80元）

资源详情

资源评论

资源推荐

salesforce: Summer '12

Force.com Apex Code Developer's Guide

Last updated: May 26 2012

names and marks. Other marks appearing herein may be trademarks of their respective owners.

Table of Contents

Chapter 1: Introducing Apex...............................................................................................................11

What is Apex?.........................................................................................................................................................................12

How Does Apex Work?..............................................................................................................................................13

What is the Apex Development Process?....................................................................................................................14

Using a Developer or Sandbox Organization...................................................................................................14

Learning Apex.................................................................................................................................................17

Writing Apex...................................................................................................................................................18

Writing Tests...................................................................................................................................................19

Deploying Apex to a Sandbox Organization...................................................................................................19

Deploying Apex to a Salesforce Production Organization...............................................................................20

Adding Apex Code to a Force.com AppExchange App..................................................................................20

When Should I Use Apex?..........................................................................................................................................21

What are the Limitations of Apex?.............................................................................................................................21

What's New?...........................................................................................................................................................................22

Apex Quick Start.....................................................................................................................................................................22

Documentation Typographical Conventions...............................................................................................................22

Understanding Apex Core Concepts...........................................................................................................................23

Writing Your First Apex Class and Trigger................................................................................................................28

Creating a Custom Object...............................................................................................................................28

Adding an Apex Class.....................................................................................................................................29

Adding an Apex Trigger..................................................................................................................................30

Adding a Test Class.........................................................................................................................................31

Deploying Components to Production............................................................................................................33

Chapter 2: Language Constructs.........................................................................................................35

Data Types..............................................................................................................................................................................36

Primitive Data Types...................................................................................................................................................36

sObject Types..............................................................................................................................................................39

Accessing sObject Fields..................................................................................................................................40

Accessing sObject Fields Through Relationships............................................................................................41

Validating sObjects and Fields .......................................................................................................................42

Collections...................................................................................................................................................................43

Lists.................................................................................................................................................................43

Sets..................................................................................................................................................................45

Maps................................................................................................................................................................46

Maps from SObject Arrays..............................................................................................................................47

Iterating Collections........................................................................................................................................47

Enums.........................................................................................................................................................................47

Understanding Rules of Conversion............................................................................................................................49

Variables..................................................................................................................................................................................51

Case Sensitivity............................................................................................................................................................51

Table of Contents

Constants.....................................................................................................................................................................52

Expressions..............................................................................................................................................................................52

Understanding Expressions.........................................................................................................................................52

Understanding Expression Operators..........................................................................................................................53

Understanding Operator Precedence...........................................................................................................................59

Extending sObject and List Expressions.....................................................................................................................60

Using Comments.........................................................................................................................................................60

Assignment Statements...........................................................................................................................................................61

Conditional (If-Else) Statements............................................................................................................................................62

Loops.......................................................................................................................................................................................63

Do-While Loops.........................................................................................................................................................63

While Loops................................................................................................................................................................63

For Loops....................................................................................................................................................................64

Traditional For Loops.....................................................................................................................................65

List or Set Iteration For Loops........................................................................................................................65

SOQL For Loops............................................................................................................................................65

SOQL and SOSL Queries......................................................................................................................................................67

Working with SOQL and SOSL Query Results.........................................................................................................69

Working with SOQL Aggregate Functions................................................................................................................69

Working with Very Large SOQL Queries..................................................................................................................70

Using SOQL Queries That Return One Record........................................................................................................72

Improving Performance by Not Searching on Null Values.........................................................................................73

Understanding Foreign Key and Parent-Child Relationship SOQL Queries.............................................................73

Using Apex Variables in SOQL and SOSL Queries...................................................................................................74

Querying All Records with a SOQL Statement..........................................................................................................75

Locking Statements.................................................................................................................................................................75

Locking in a SOQL For Loop....................................................................................................................................76

Avoiding Deadlocks....................................................................................................................................................76

Transaction Control................................................................................................................................................................76

Exception Statements..............................................................................................................................................................77

Throw Statements.......................................................................................................................................................77

Try-Catch-Finally Statements.....................................................................................................................................77

Chapter 3: Invoking Apex...................................................................................................................79

Triggers...................................................................................................................................................................................80

Bulk Triggers...............................................................................................................................................................81

Trigger Syntax.............................................................................................................................................................81

Trigger Context Variables...........................................................................................................................................82

Context Variable Considerations.................................................................................................................................84

Common Bulk Trigger Idioms....................................................................................................................................85

Using Maps and Sets in Bulk Triggers............................................................................................................85

Correlating Records with Query Results in Bulk Triggers..............................................................................86

Using Triggers to Insert or Update Records with Unique Fields.....................................................................86

Defining Triggers........................................................................................................................................................86

Triggers and Merge Statements..................................................................................................................................88

Table of Contents

Triggers and Recovered Records.................................................................................................................................89

Triggers and Order of Execution.................................................................................................................................89

Operations That Don't Invoke Triggers......................................................................................................................91

Fields that Aren’t Available or Can’t Be Updated in Triggers.....................................................................................92

Trigger Exceptions......................................................................................................................................................93

Trigger and Bulk Request Best Practices.....................................................................................................................93

Apex Scheduler........................................................................................................................................................................94

Anonymous Blocks..................................................................................................................................................................99

Apex in AJAX.......................................................................................................................................................................100

Chapter 4: Classes, Objects, and Interfaces........................................................................................102

Understanding Classes..........................................................................................................................................................103

Defining Apex Classes...............................................................................................................................................103

Extended Class Example...........................................................................................................................................104

Declaring Class Variables..........................................................................................................................................107

Defining Class Methods............................................................................................................................................108

Using Constructors....................................................................................................................................................110

Access Modifiers........................................................................................................................................................112

Static and Instance.....................................................................................................................................................113

Using Static Methods and Variables..............................................................................................................113

Using Instance Methods and Variables..........................................................................................................114

Using Initialization Code...............................................................................................................................115

Apex Properties.........................................................................................................................................................116

Interfaces and Extending Classes..........................................................................................................................................118

Parameterized Typing and Interfaces........................................................................................................................119

Custom Iterators........................................................................................................................................................122

Keywords...............................................................................................................................................................................124

Using the final Keyword............................................................................................................................................124

Using the instanceof Keyword...................................................................................................................................124

Using the super Keyword...........................................................................................................................................124

Using the this Keyword.............................................................................................................................................126

Using the transient Keyword.....................................................................................................................................126

Using the with sharing or without sharing Keywords................................................................................................127

Annotations...........................................................................................................................................................................129

Deprecated Annotation.............................................................................................................................................130

Future Annotation.....................................................................................................................................................130

IsTest Annotation.....................................................................................................................................................132

ReadOnly Annotation...............................................................................................................................................135

RemoteAction Annotation........................................................................................................................................135

Apex REST Annotations..........................................................................................................................................136

RestResource Annotation..............................................................................................................................136

HttpDelete Annotation.................................................................................................................................137

HttpGet Annotation......................................................................................................................................137

HttpPatch Annotation...................................................................................................................................137

HttpPost Annotation.....................................................................................................................................137

iii

Table of Contents