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
How DML Works
Adding and Retrieving Data With DML
DML Statements vs. Database Class Methods
DML Operations As Atomic Transactions
DML Operations
Exception Handling
Database Class Method Result Objects
Returned Database Errors
More About DML
Locking Records
SOQL and SOSL Queries
SOQL For Loops
sObject Collections
Dynamic Apex
Apex Security and Sharing Model
Custom Settings
Document Your Apex Code
Running Apex
Debugging, Testing, and Deploying Apex
Apex Reference
Appendices
PDF

Note: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.

Exception Handling

DML statements return run-time exceptions if something went wrong in the database during the execution of the DML operations. You can handle the exceptions in your code by wrapping your DML statements within try-catch blocks. The following example includes the insert DML statement inside a try-catch block.

1Account a = new Account(Name='Acme');
2try {
3    insert a;
4} catch(DmlException e) {
5    // Process exception here
6}