Apex Developer Guide

Apex Developer Guide
Getting Started with Apex
Writing Apex
Running Apex
Debugging, Testing, and Deploying Apex
Apex Language Reference
Apex DML Operations
ApexPages Namespace
AppLauncher Namespace
Approval Namespace
Auth Namespace
Cache Namespace
Canvas Namespace
ChatterAnswers Namespace
ConnectApi Namespace
Database Namespace
Datacloud Namespace
DataSource Namespace
Dom Namespace
EventBus Namespace
Flow Namespace
KbManagement Namespace
Messaging Namespace
Metadata Namespace
Process Namespace
QuickAction Namespace
Reports Namespace
Schema Namespace
Search Namespace
Sfc Namespace
Site Namespace
Support Namespace
System Namespace
AccessType Enum
Address Class
Answers Class
ApexPages Class
Approval Class
Blob Class
Boolean Class
BusinessHours Class
Callable Interface
Cases Class
Comparable Interface
Continuation Class
Cookie Class
Crypto Class
Custom Settings Methods
Database Class
Date Class
Datetime Class
Decimal Class
Double Class
EncodingUtil Class
Enum Methods
EventBus Class
Exception Class and Built-In Exceptions
FlexQueue Class
FeatureManagement Class
Formula Class
FormulaRecalcFieldError Class
FormulaRecalcResult Class
Http Class
HttpCalloutMock Interface
HttpRequest Class
HttpResponse Class
Id Class
Ideas Class
InstallHandler Interface
Integer Class
JSON Class
JSONGenerator Class
JSONParser Class
JSONToken Enum
Limits Class
List Class
Location Class
Long Class
Map Class
Matcher Class
Math Class
Messaging Class
MultiStaticResourceCalloutMock Class
Network Class
OrgLimit Class
OrgLimits Class
PageReference Class
Packaging Class
getCurrentPackageId()
Pattern Class
Queueable Interface
QueueableContext Interface
QuickAction Class
RemoteObjectController
ResetPasswordResult Class
RestContext Class
RestRequest Class
RestResponse Class
SandboxPostCopy Interface
Schedulable Interface
SchedulableContext Interface
Schema Class
Search Class
Security Class (Beta)
SelectOption Class
Set Class
Site Class
SObject Class
SObjectAccessDecision Class
StaticResourceCalloutMock Class
String Class
StubProvider Interface
System Class
Test Class
Time Class
TimeZone Class
Trigger Class
TriggerOperation Enum
Type Class
UninstallHandler Interface
URL Class
UserInfo Class
UserManagement Class
Version Class
WebServiceCallout Class
WebServiceMock Interface
XmlStreamReader Class
XmlStreamWriter Class
TerritoryMgmt Namespace
TxnSecurity Namespace
UserProvisioning Namespace
VisualEditor Namespace
wave Namespace
Appendices
Glossary
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Packaging Class

Contains a method for obtaining information about managed and unlocked packages.

Namespace

System

Usage

In the context of a package, use the getCurrentPackageId method to retrieve the packageID.