Batch Apex #inSalesforce

Batch Apex #inSalesforce

Scenario: Activate and update the Account's description 

Create an Apex Batch Class:

The Database.Batchable interface contains three methods that must be implemented - Start, Execute, and Finish

global class batchJobAccounts implements Database.Batchable<sObject>{

    global Database.QueryLocator start(Database.BatchableContext bc){

        String query = 'SELECT Id, Active__c, Description FROM Account';

        return Database.getQueryLocator(query);

    }

    global void execute(Database.BatchableContext bc, List<Account> scope){

        for(Account act: scope){

            act.Active__c = True;

            act.Description = 'Activated';

        }

        update scope;

    }

    global void finish(Database.BatchableContext bc){

        system.debug('!!!!Job Completed!!!!!');

    }

}

To monitor the job : Setup | Apex Jobs

To debug:

Go to Developer Console | Anonymous Window |
batchJobAccounts batchJob = new batchJobAccounts();
Database.executeBatch(batchJob,200);

Reference: https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_batch_interface.htm