Apex Developer Guide

Apex Developer Guide
Release Notes
Getting Started with Apex
Writing Apex
Data Types and Variables
Control Flow Statements
Classes, Objects, and Interfaces
Working with Data in Apex
Working with sObjects
Data Manipulation Language
SOQL and SOSL Queries
SOQL For Loops
sObject Collections
Dynamic Apex
Understanding Apex Describe Information
Using Field Tokens
Understanding Describe Information Permissions
Describing sObjects Using Schema Method
Describing Tabs Using Schema Methods
Accessing All sObjects
Accessing All Data Categories Associated with an sObject
Dynamic SOQL
Dynamic SOSL
Dynamic DML
Apex Security and Sharing Model
Custom Settings
Document Your Apex Code
Running Apex
Debugging, Testing, and Deploying Apex
Apex Reference
Appendices
PDF

Understanding Describe Information Permissions

Apex classes run in user mode by default, which means that user permissions on objects and field-level security are respected. A user cannot run code that tries to access fields or objects that are hidden from the user.

User permissions also matter when you execute describe calls in an anonymous block.. As a result, not all sObjects and fields can be looked up if access is restricted for the running user. For example, if you describe account fields in an anonymous block and you don’t have access to all fields, not all fields are returned.