Lesson: 37 | Batch Apex | Update Records

Code

Apex Class:

global class UpdateCases implements Database.Batchable<SObject>{
    global final String query;
    global Database.QueryLocator start(Database.BatchableContext bc) {
        return Database.getQueryLocator(query);
    }
    global void execute(Database.BatchableContext bc, List<Case> scope) {
        for(Case cs : scope){
            if(cs.Status=='New'){
                cs.Priority='High';
            }
        }
        update scope;
    }
    global void finish(Database.BatchableContext bc) {
        
        AsyncApexJob job = [select Id, Status, NumberOfErrors, JobItemsProcessed, TotalJobItems, CreatedBy.Email From AsyncApexJob where Id = :bc.getJobId() ];
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        String[] toAddress = new String[]{job.CreatedBy.Email};
            mail.setToAddresses(toAddress);
        mail.setSubject('Apex job Status' + job.Status);
        mail.setPlainTextBody('The apex job processed ' + job.TotalJobItems + ' Batches with ' + job.NumberOfErrors + ' failures');
        Messaging.sendEmail(new Messaging.SingleEmailMessage[] {mail});
        
        
    }
}

Apex Code (Execution):

UpdateCases objA = new UpdateCases();
objA.query = 'SELECT Id, Status,Priority FROM Case';
Database.executeBatch(objA,100);