func (c *ClusterTx) NodeUpdate(id int64, name string, address string) error {
	result, err := c.tx.Exec("UPDATE nodes SET name=?, address=? WHERE id=?", name, address, id)
	if err != nil {
		return err
	}
	n, err := result.RowsAffected()
	if err != nil {
		return err
	}
	if n != 1 {
		return fmt.Errorf("query updated %d rows instead of 1", n)
	}
	return nil
}
func (c *ClusterTx) NodeUpdate(id int64, name string, address string) error {
	result, err := c.tx.Exec("UPDATE nodes SET name=?, address=? WHERE id=?", name, address, id)
	if err != nil {
		return err
	}
	n, err := result.RowsAffected()
	if err != nil {
		return err
	}
	if n != 1 {
		return fmt.Errorf("query updated %d rows instead of 1", n)
	}
	return nil
}
// NodeUpdate updates the name an address of a node.