Hi!

I'm developing WebForms apps that use NHibernate to persist my objects. I'd like to know how do you transport (carry) your interface data to the NHibernate methods. (please, I'd like solutions in a Master/Detail scenario)

For example, I have two fields: Id and Name. When I click "Save", I create an XXX object, set the properties (id and name) and call XXX.Save(my object).

But when I have a list of items, how do you keep it in memory before save? I was thinking to use DataSets ... how do you do?

Thanks

i think you mean "collection" when talking about "list." if so, you have a couple of options depending upon how you associate (map) your objects.

If you have a Master -> Detail like so:



and a Detail -> Master like so:



you have several options one of the easiest being save your master object first, then create detail objects, adding them to your Master.Details collection, then persist Master



because cascade is set, the new Detail objects will be persisted.

just one way of doing it but it really depends on your internal code...

The problem is here:



where do you keep your data to load into the myDetail object? Could you complete the "..."? :)

I've been used datasets ... I save my items into a dataSet, move them to myDetail objects, add them to the Master and Save the master.

Do you use datasets too?

Thanks

What do you think about use datasets in the interface and when the user clicks Save button I move the data from the DataSet to DAO objects?

sorry for the delay in responding...

i'm not really sure why you would create "datasets" and not objects (or a collection of objects) and pass then to your DAOs. why do you feel you need to use a "dataset?"

Hello Devonl!

I'm thinking to use DataSets junt in the interface layer to keep the data in memory before save them. I don't know how to use collections. Is it possible? Simple? :)

My app has three layers:

- Interface
- Logic
- NHibernate

Has any other way to do a master/detail without datasets? Using collections is difficult?

My Logic layer just work with Objects. So, in my interface I move the records from dataSets to objects/collections and then I call the Logic Layer. For example, the button Save:

// load the master (any object)
...

// load the details
List<Person> p = new List<Person>();

foreach (PersonRow row in DataSetPerson.Rows)
{
p.Add(new Person(row.Id, row.Name));
}

// save all
master.Save(...) // this will save the master and details

So, what do you thnik about it? Should I use another approach to move my data from interface to logic layer?

Thanks!

that works fine. if you want to use datasets in your interface, then by all means. i don't see any problem with it. however, you wouldn't normally assign the ID to the person object; instead allowing the database to set the identity.

-devon