code: def ReadCronJobs(self, cronjob_ids=None, cursor=None):
      
      query = ("SELECT job, UNIX_TIMESTAMP(create_time), enabled, "
               "forced_run_requested, last_run_status, "
               "UNIX_TIMESTAMP(last_run_time), current_run_id, state, "
               "UNIX_TIMESTAMP(leased_until), leased_by "
               "FROM cron_jobs")
      if cronjob_ids is None:
        cursor.execute(query)
        return [self._CronJobFromRow(row) for row in cursor.fetchall()]
  
      query += " WHERE job_id IN (%s)" % ", ".join(["%s"] * len(cronjob_ids))
      cursor.execute(query, cronjob_ids)
      res = []
      for row in cursor.fetchall():
        res.append(self._CronJobFromRow(row))
  
      if len(res) != len(cronjob_ids):
        missing = set(cronjob_ids) - set([c.cron_job_id for c in res])
        raise db.UnknownCronJobError("CronJob(s) with id(s) %s not found." %
                                     missing)
      return res
docs: Reads all cronjobs from the database.