Scheduling batch Apex

Question

Hi this is my batch apex code

global class batchAUpdate_based_on_stage implements Database.Batchable<sObject>
{
    global Database.QueryLocator start(Database.BatchableContext BC)
    {
        String query = 'SELECT Id,Name,child_stage__c FROM Child__c ';
        return Database.getQueryLocator(query);
    }

    global void execute(Database.BatchableContext BC, List<Child__c> scope)
    {
        for (child__c child : scope){

         if(child.child_stage__c == '25%'){
             child.child_stage__c = '100%';
         }
          update child;

        }
    }  
    global void finish(Database.BatchableContext BC)
    {
    }
}

And this is my scheduler class when i save it i'm not getting in the scheduled job list, i mean at Setup>moniter>scheduled job

global class Scheduler_class implements Schedulable{
    global void execute (SchedulableContext SC){
         batchAUpdate_based_on_stage b1 = new  batchAUpdate_based_on_stage();
       database.executeBatch(b1);
      // string sch = '0 0 0 1 4 ?';
       string sch = '0 1 1 * * ?';
       system.schedule ('Batch', sch, new Scheduler_class());
    }
}

can anyone tell where i'm going wrong.

Answer 1

Just saving the class does not schedule it. You still need to tell the DB to schedule it. I generally write a schedule function within my class so that I can easily call it in one line, that uses my static chron string within the class. Something like this should work

global class Scheduler_class implements Schedulable{

    public static String sched = '0 00 00 * * ?';  //Every Day at Midnight 

    global static String scheduleMe() {
        Scheduler_class SC = new Scheduler_class(); 
        return System.schedule('My batch Job', sched, SC);
    }

    global void execute(SchedulableContext sc) {

        batchAUpdate_based_on_stage b1 = new batchAUpdate_based_on_stage();
        ID batchprocessid = Database.executeBatch(b1,50);           
    }
}

The you just need to run Scheduler_class.scheduleMe(); from execute anonymous and it will be scheduled to run at your interval. This is important as this tells the DB to actually schedule it.

Answer 2

The presence of the class alone will not cause it to make its way into any schedules.

I think you need to run System.schedule from execute anonymous (eg in Developer Console).

System.schedule('My First Schedule', '0 1 1 * * ?', new Scheduler_class())