do we need to write a batchable class to schedule a class - salesforce

Question

I am trying to generate a report and send a report to email as an attachment in salesforce. I have created a controller, created a class for csv stream and an email template. I want to schedule the class. when I schedule it I am unable to achieve the result. Could anyone help me in achieving this?
The code I tried is created a visualforce component, class, and an email template.
The code I tried is to schedule it for every 5 minutes. but I am getting an error.
Do we need to write a batchable class for this
global class IncrementReport implements Schedulable {
global void execute(SchedulableContext ctx) {
System.debug('Entered Cron trigger');
rptobj__c r = [SELECT Id, Name, reporttrigger__c FROM rptobj__c WHERE Name = 'ThisReport' LIMIT 1];
r.reporttrigger__c += 1;
String s = '0 0 * * * ?' ';
IncrementReport abc = new IncrementReport();
system.schedule('Report Job', s, abc);
System.debug('updating trigger to: ' + r.reporttrigger__c);
update r;
}
}

Answer 1

You only write the logic in your scheduler class.
global class IncrementReport implements Schedulable {
global void execute(SchedulableContext ctx) {
System.debug('Entered Cron trigger');
rptobj__c r = [SELECT Id, Name, reporttrigger__c FROM rptobj__c WHERE Name = 'ThisReport' LIMIT 1];
r.reporttrigger__c += 1;
System.debug('updating trigger to: ' + r.reporttrigger__c);
update r;
}
}
And then, can run this cron expression from Developer Console.
String sch1 = '0 0 * * * ?';
IncrementReport ir1 = new IncrementReport();
system.schedule('Every Hour plus 0 min', sch1, ir1);
String sch2 = '0 5 * * * ?';
IncrementReport ir2 = new IncrementReport();
system.schedule('Every Hour plus 5 min', sch2, ir2);
String sch3 = '0 10 * * * ?';
IncrementReport ir3 = new IncrementReport();
system.schedule('Every Hour plus 10 min', sch3, ir3);
String sch4 = '0 15 * * * ?';
IncrementReport ir4 = new IncrementReport();
system.schedule('Every Hour plus 15 min', sch4, ir4);
// And so on ir5, ir6 .... ir12
As you want to run the scheduler in every 5 minutes, you have to system.schedule 12 times as 12*5 = 60 minutes = 1 hour
You can see whether the job is running or not on
Setup -> Scheduled Jobs