Getting the last record processed in batch apex class

Question

What is the best way to grab the last record processed in one batch? The last record needs to be marked so a new record-triggered flow can begin when the last record in one transaction ends. Thanks.

Answer 1

You can use Database.Stateful to allow instance variables to maintain state between batches (see the documentation for more details). Interestingly, static variables get reset - so you can't use those.

In you execute method, save the last record you just processed for that batch. This will get overwritten, but it will be the correct record when the finish method is called.

public class YourBatchJob implements Database.Batchable<SObject>, Database.Stateful {
    private SObject lastRecord;
    ...

    public void start(...) {
      ...
    }

    public void execute(Database.BatchableContext bc, List<SObject> scope) {
      // Do other batch stuff
      ...

      // Now remember which record was last (successfully) processed here
      lastRecord = scope[scope.size() - 1];
    }

    public void finish(Database.BatchableContext bc){
      // Do something with lastRecord 
      ...
    }
}