Scheduling an apex batch

Question

I have a batch and now I want to create a schedulable class to run the batch every Saturday at 1AM. I was following the salesforce docs but cannot seem to grasp everything correctly.

Here's my schedulable class code

global class SchedulableClass implements Schedulable {
    global void execute(SchedulableContext sc) {
        IndependentBatch b = new IndependentBatch();
        database.executebatch(b);
    }
    SchedulableClass saturday1am = new SchedulableClass();
    String sch = '0 0 01 ? * 7';
    String jobId = system.schedule('sat1am', sch, saturday1am);
}

How do I activate this class? Is my syntax correct? Am I supposed to move the string sch and system.schedule inside the execute? If so do I remove the database.executebatch(b) in this case?

Answer 1

This code:

SchedulableClass saturday1am = new SchedulableClass();
String sch = '0 0 01 ? * 7';
String jobId = system.schedule('sat1am', sch, saturday1am);

Needs to be outside of that class, since that is the code that schedules your job.

You can either put that code inside another class, or run it from "Execute Anonymous".

Answer 2

Just a note, you can implement Schedulable in the same class as your Batchable. No need to write them separately.

public class MySchedulableBatch implements Schedulable, Database.Batchable<SObject>
{
    public void execute(SchedulableContext sc) { Database.executeBatch(this); }
    // Database.Batchable implementation
}