Apex Intermediate Progress | ( Lessons)

Lesson: 02 | Batch Apex | stateful

Notes

Batch Apex is typically stateless. Each execution of a batch Apex job is considered a discrete transaction. For example, a batch Apex job that contains 1,000 records and uses the default batch size is considered five transactions of 200 records each.

When using Database.Stateful, only instance member variables retain their values between transactions.

public class BatchApexStateful  implements Database.Batchable<sObject>, Database.Stateful {
    
    public Integer recordsProccessed =0;
    public Database.QueryLocator start(Database.BatchableContext BC){
        
        return Database.getQueryLocator('SELECT Id, Rating FROM Account');
    }
    
    public void execute(Database.BatchableContext BC, List<Account> acList){
        
        for(Account ac : acList){
            
            ac.Rating='Cold';
            
            recordsProccessed +=1;
        }
        
        update acList;
    }
    
    public void finish(Database.BatchableContext BC){
        
        System.debug(recordsProccessed + 'Accounts has been updated');
    }

}

UpdateContactAddresses objA = new UpdateContactAddresses();
Database.executeBatch(objA,1);

Exercises

#	Exercise
1	Batch Apex Stateful

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Apex Intermediate

A. Apex DML Operations (8 lessons)

B. Apex Classes (17 lessons)

C. Apex Triggers (9 lessons)

D. Apex Exceptions (11 lessons)

E. Asynchronous Apex (6 lessons)

F. SOSL (10 lessons)

G. Testing Apex (9 lessons)

H. Apex Fast Recap (142 lessons)

I. Build Apex Coding Skills (64 lessons)

J. Miscellaneous (17 lessons)

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Lesson: 02 | Batch Apex | stateful

Notes

Apex Intermediate