Wow...ok...I'm making a total disaster of this. I can't help but
think there's an easier way. :(
I've got this method in what we could call a "dao":
public List<Incident> getFiltered(int first, int count, String orderBy)
{
String query = "select i from Incident i order by :orderBy";
Query q = this.em.createQuery(query);
q.setParameter("orderBy", orderBy);
q.setFirstResult(first);
q.setMaxResults(count);
return q.getResultList();
}
And I've got started what might someday become a provider class:
public class IncidentsProvider
extends SortableDataProvider
implements IDetachable
{
private transient List<Incident> incidents;
/**
* default ctor
*/
public IncidentsProvider(Integer first, Integer count, String orderBy)
{
this.incidents = myDao.getFiltered(first, count, orderBy);
setSort("openDate", true);
}
public Iterator iterator(int first, int count)
{
return this.incidents.listIterator(first); //???? - what do do?
}
public int size()
{
return this.incidents.size();
}
public IModel model(Object object)
{
return new Model((Serializable)object);
}
public void detach()
{
this.incidents = null;
}
}
As you can see, I'm trying to marry my provider to my DAO as closely
as possible...I'm not worried about elegance and cleanliness right now
- just trying to take it one step at a time and get it *working*.
I can make some sort of 'if asc then make desc' and vice/versa afterward....
Sorry, it's been a long day...maybe I need a break....two or three
weeks ought to do it.
On 7/18/06, Igor Vaynberg <[EMAIL PROTECTED]> wrote:
> then the only semidifficult part is the sorting - you need to come up with
> some utils that append the sort for you.
>
> as far as paging it would translate directly to
>
> session.setFirstResult(queryparam.getFirst()).setMaxResults(
> queryparam.getCount());
>
> -Igor
>
>
>
> On 7/18/06, Vincent Jenks <[EMAIL PROTECTED]> wrote:
> >
> Well, I don't have DAOs in this particular project - it's an EJB3
> project where I'm simply using SLSBs as DAOs....so I have the
> EntityManager to work from and I should be able to bring the two
> together to facilitate this...
>
> This may be easier than I thought....
>
> On 7/18/06, Igor Vaynberg < [EMAIL PROTECTED]> wrote:
> > yep, you have to code your daos with paging and sorting in mind, it cannot
> > be slapped on as an afterthought.
> >
> > let me give you some clues
> >
> > see the attached QueryParam class, all my finder dao methods take it so
> that
> > they can page/sort accordingly.
> >
> > hope it gets you started
> >
> >
> > -Igor
> >
> >
> >
> >
> > On 7/18/06, Vincent Jenks < [EMAIL PROTECTED] > wrote:
> > > Currently I don't have anything like the ContactsDatabase class in
> > > 'examples' - I'm just pulling a list of data and displaying in a
> > > ListView....but it appears now that I'm browsing through I'm going to
> > > have to create one and implement some of the methods like you have in
> > > order to get paging/sorting.
> > >
> > > I'll play w/ it...it was just a little more than I expected once I
> > > started digging into it.
> > >
> > > On 7/18/06, Igor Vaynberg <[EMAIL PROTECTED]> wrote:
> > > > what could be simpler then the dataview? its just like a listview only
> > > > instead of being fed off the list it is fed from the idataprovider.
> > > >
> > > > class mydataprovider implements idataprovider() {
> > > > iterator iterator(int first, int count) {
> > > > return mydao.findcontacts(first, count).iterator();
> > > > }
> > > >
> > > > int size() {
> > > > return mydao.countcontacts();
> > > > }
> > > >
> > > > model model(object o) {
> > > > Contact contact=(Contact)o;
> > > > return new
> ContactDetachableModel(contact);
> > > > //or return new Model(contact);
> > > > }
> > > > }
> > > >
> > > > and that gets you paging, sorting is like this
> > > >
> > > > mydataprovider extends sortabledataprovider {
> > > > // ditto from above
> > > >
> > > > iterator iterator(int first, int last) {
> > > > return mydao.findcontacts(first, last,
> getsort().getproperty(),
> > > > getsort().getcount();
> > > > }
> > > >
> > > > }
> > > >
> > > >
> > > > if you have more specific questions i will be happy to help you
> > > >
> > > > -Igor
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > On 7/18/06, Vincent Jenks <[EMAIL PROTECTED]> wrote:
> > > > >
> > > > Is there something smaller & simpler out there I could refer to for
> > > > sorting? I've glanced at the DataView example a few times and once I
> > > > start digging in it just seems unwieldly to me. I'm simply trying to
> > > > sort a List of entities and the getContactsDB() stuff in the examples
> > > > is a bit complicated to try and pick through.
> > > >
> > > > I gave paging a shot yesterday but quickly figured out it wouldn't be
> > > > a snap to throw together like most wicket stuff I've done so
> > > > far....I'm in a crunch or I'd spend more time banging my head on the
> > > > table.
> > > >
> > > > I think if I just had a couple real-world examples I'd pick it up
> > faster.
> > > >
> > > > How's that book coming along? :D
> > > >
> > > > Thanks!
> > > >
> > > >
> >
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