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
More About DML
Locking Records
Locking Statements
Locking in a SOQL For Loop
Avoiding Deadlocks
SOQL and SOSL Queries
SOQL For Loops
sObject Collections
Dynamic Apex
Apex Security and Sharing
Custom Settings
Running Apex
Debugging, Testing, and Deploying Apex
Apex Reference
Appendices
Glossary
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Locking Records

When an sObject record is locked, no other client or user is allowed to make updates either through code or the Salesforce user interface. The client locking the records can perform logic on the records and make updates with the guarantee that the locked records won’t be changed by another client during the lock period.