hibernate的一些问题，请教？

IUserBusiness userBiz = (IUserBusiness) BusinessFactory.getBusiness(IUserBusiness.class.getName());
User user = userBiz.getUserById(userid);

IPayWayBusiness pwBiz = (IPayWayBusiness) BusinessFactory.getBusiness(IPayWayBusiness.class.getName());
PayWay payway = pwBiz.findPayWayById(Long.parseLong(request.getParameter("payway")));

IOrderStatusBusiness statusBiz = (IOrderStatusBusiness) BusinessFactory.getBusiness(IOrderStatusBusiness.class.getName());
OrderStatus status = statusBiz.findOrderStatusById(new Long(1));

IShoppingCart shoppingCart = (IShoppingCart) session.getAttribute("cart");

Orders order = new Orders();
order.setCost(shoppingCart.getTotalPrice());
order.setUsers(user);
order.setPayway(payway);
order.setOrderstatus(status);

Map<Long, OrderLine> item = shoppingCart.getOrderLineMap();
Set<Long> key = item.keySet();
for(Iterator<Long> it = key.iterator();it.hasNext();){
   long temp = it.next();
   OrderLine ol = item.get(temp);
   ol.setOrders(order);
   order.getOrderlines().add(ol);
}

IOrderBusiness orderBiz = (IOrderBusiness) BusinessFactory.getBusiness(IOrderBusiness.class.getName());
orderBiz.checkOut(order);//将order持久化

Order和OrderLine是两个实体类，一对多关系，为什么在我持久化order是会出现如下sql语句，请指教？

Hibernate: insert into orders (paywayid, userid, statusid, name, cost, orderid) values (?, ?, ?, ?, ?, ?)
Hibernate: insert into orderline (PRODUCTID, orderid, amount, lineid) values (?, ?, ?, ?)
Hibernate: update payway set paystyle=? where paywayid=?
Hibernate: update contactinfo set userid=?, street1=?, street2=?, city=?, countryid=?, provinceid=?, zip=?, email=?, homephone=?, cellphone=?, officephone=? where contactid=?
Hibernate: update orderstatus set name=?, description=? where statusid=?
Hibernate: update PRODUCT set CATEGORYID=?, NAME=?, DESCRIPTION=?, BASEPRICE=?, AUTHOR=?, PUBLISH=?, PAGES=?, IMAGES=? where PRODUCTID=?

怎样做才能去掉上面的update语句？