Sorting on many side of relationship

Question

I have a question.
There is one to many kind of relationship between Employee & Address table
Address table has following columns : id, street, city.
I have established one to many relationship in Employee class using valueholder.
But when I want to get address from Employee, I want address to be sorted on city column.
How can I do it?
e.g.
Expression exp = new ExpressionBuilder().get("empId").equal( "22");
ReadObjectQuery query = new ReadObjectQuery( Employee.class, exp );
Employee emp = (Employee)this.session.executeQuery( query);
ArrayList addresses= (ArrayList) emp.getAddresses();
// Here I want to get address sorted on some column (say city). How can I specify it.
1. I know, We can use ReadAllQuery.addAscendingOrder(). But here I want to use ReadObjectQuery
since I ma getting only 1 employee object. So I can't use ReadAllQuery
2. The other problem is in this case, sorting is required on many side of relationship.
So How can I achieve this using toplink?
Also, if I want to cache the results, can same solution be utilized?
Any help is highly appreciated.
Thanks.

Answer 1

You can configure sorting on the one to many mapping so that when the address list is retrieved from the database an ORDER BY clause is used. This can be configured in the mapping editor.
Sorting on the ReadObjectQuery does not apply as you will only be getting a single instance back. configuring it on the mapping is what you want.
Doug