GWT + Hibernate + saving bandiwidth -


i writing gwt app using hibernate save on server.

i have similar concept customer -> orders. if create class customer , class orders, in database, order table has foreign key customer table.

say wanted retrieve orders server, , not care customer. if write bring down orders, automatically bring down customer if use eager loading. if not want that, can leave lazy loading , orders, , assume myorder.getcustomer() == null.

now if wanted create order on client, there way set customerid on order , pass save without having pass customer object it. i.e.

order myorder = new order(); . . . myorder.setcustomerid("1234"); rpcsave(myorder); 

or option have

customer me = new customer() order myorder = new order() . . . myorder.setcustomer(me); rpcsave(myorder); 

thanks,

nadin

one options use transient field in customer linked order:

public class order {     @transient      private string customerid;     ...     // setter/getter methods } 

here how value used on client:

order myorder = new order(); ... myorder.setcustomid("1234"); rpcsave(myorder); 

here how value used on server:

if (order.getcustomerid() != null) {     customer customer = // lookup customer primary key     order.setcustomer(customer); } 

this logic allows client create link between order , customer without requiring custom object itself. server code, on other hand, tasked looking customer instance , adding actual order.

the problem approach adds attributes , methods order object not serve purpose , make code harder follow.

an alternative approach change rpcsave operation take in order , customerid. server lookup customer based on id , make association itself. thereby saving overhead of data transmission, while keeping order object simple:

// client order myorder = new order(); ... rpcsave("1234", myorder);  // server customer customer = // find customer customerid; neworder.setcustomer(customer); ... 

hope helps.


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