Example 1 :
global class BatchApexExample implements Database.Batchable<sObject> {
global Database.QueryLocator start(Database.BatchableContext BC) {
// collect the batches of records or objects to be passed to execute
String query = 'SELECT Id, Name FROM Account';
return Database.getQueryLocator(query);
}
global void execute(Database.BatchableContext BC, List<Account> accList) {
// process each batch of records default size is 200
for(Account acc : accList) {
// Update the Account Name
acc.Name = acc.Name + 'sfdcpoint';
}
try {
// Update the Account Record
update accList;
} catch(Exception e) {
System.debug(e);
}
}
global void finish(Database.BatchableContext BC) {
// execute any post-processing operations like sending email
}
}
Example 2 :
public class UpdateContactFields implements Database.Batchable<sObject>{
public String query;
public Database.QueryLocator start(Database.BatchableContext BC){
return Database.getQueryLocator(query);
}
public void execute(Database.BatchableContext BC, List<sObject> scope){
List<Contact> contacts = new List<Contact>();
for(sObject s : scope)
{
Contact con = (Contact)s;
con.Description = 'Belongs to inactive account';
contacts.add(con);
}
update contacts;
}
public void finish(Database.BatchableContext BC)
{
}
}
Example 3 :
public class batchClass implements Database.batchable{
public Iterable start(Database.BatchableContext info){
return new CustomAccountIterable();
}
public void execute(Database.BatchableContext info, List<Account> scope){
List<Account> accsToUpdate = new List<Account>();
for(Account a : scope){
a.Name = 'true';
a.NumberOfEmployees = 70;
accsToUpdate.add(a);
}
update accsToUpdate;
}
public void finish(Database.BatchableContext info){
}
}
Example 4 :
public class MyBatchJob implements
Database.Batchable<sObject>, Database.Stateful{
public integer summary;
public MyBatchJob(String q){
Summary = 0;
}
public Database.QueryLocator start(Database.BatchableContext BC){
return Database.getQueryLocator(query);
}
public void execute(
Database.BatchableContext BC,
List<sObject> scope){
for(sObject s : scope){
Summary ++;
}
}
public void finish(Database.BatchableContext BC){
}
}
Example 5 :
global class AccountUpdateBatch implements Database.Batchable<SObject> {
global Database.QueryLocator start(Database.BatchableContext BC) {
// Query to fetch account records
String query = 'SELECT Id, Name FROM Account WHERE CreatedDate = TODAY';
return Database.getQueryLocator(query);
}
global void execute(Database.BatchableContext BC, List<Account> scope) {
// Process each batch of records
List<Account> accountUpdateList = new List<Account>();
for (Account acc : scope) {
acc.Description = 'Updated by system batch process';
accountUpdateList.add(acc);
}
if(accountUpdateList.size()>0){
update accountUpdateList;
}
}
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