PendingIntent pendingIntent;
public class xxx{

public void updateObjects(){

deleteIntents(Context context, int x);
(...)
for(...){
    //Update each object ofdb4o with the new object value's.
    (...)
    doIntents(context,mil,obj);
    }
            (...)
    }

public void doIntents(Context context, long mil, ClassObjects obj){
(...)
pendingIntent = PendingIntent.getBroadcast(context, obj.getId(), intent, PendingIntent.FLAG_UPDATE_CURRENT);
(...)
}
}

public void deleteIntents(Context context, int x){
            intent = new Intent(context, OnAlarmReceiver.class);
            for(int i=1;i<x;i++){
                pendingIntent = PendingIntent.getBroadcast(context, i, intent, PendingIntent.FLAG_UPDATE_CURRENT);
                alarmManager.cancel(pendingIntent);
            }
            Log.d(TAG,"intents removed");
        }

xxx.deleteIntents(getApplicationContext(),x);

public void deleteIntents(Context context, int x){
            alarmManager = (AlarmManager) context.getSystemService (Service.ALARM_SERVICE);
            intent = new Intent(context, OnAlarmReceiver.class);
            for(int i=1;i<x;i++){
                pendingIntent = PendingIntent.getBroadcast(context, i, intent, PendingIntent.FLAG_UPDATE_CURRENT);
                alarmManager.cancel(pendingIntent);
            }
            Log.d(TAG,"intents removed");
        }