code: func (q *Query) Exec() error {
  	return q.Connection.timeFunc("Exec", func() error {
  		sql, args := q.ToSQL(nil)
  		log(logging.SQL, sql, args...)
  		_, err := q.Connection.Store.Exec(sql, args...)
  		return err
  	})
  }
docs: // Exec runs the given query.