For a PC object like

class Person{
String firstName;
String lastName;
String address;
}

Currently I can set a named fetch-group in the .jdo file and add it in
the fetch plan. It would've been great if I would've been able to do
the following:

Query query = pm.newQuery(Person.class);
FetchGroup criteria = new FetchGroup();
criteria.add("firstName").add("lastName");
query.getFetchPlan().clearGroups().addGroup(fg);

Is there a way I can do something like the above (dynamic fetch
groups) with the current spec?
If not, do you think something like this is worth adding to the future
release of JDO?
Would be great to have something like this.

I know that I could project some fields using:
query.setResult("firstName, lastName");
query.setResultClass(Value.class);

public class Value{
String firstName;
String lastName;
}

But the problem here is that Value is not really a PC class.

Any help would be appreciated.

Thanks!

--
Karan Singh Malhi

[ Post a follow-up to this message ]

Sorry,

The code should read as:
Query query = pm.newQuery(Person.class);
FetchGroup criteria = new FetchGroup(Person.class);
// or I could also do
// FetchGroup criteria = new FetchGroup(query);

criteria.add("firstName").add("lastName");
query.getFetchPlan().clearGroups().addGroup(criteria);

On 10/14/07, Karan Malhi <karan.malhi@gmail.com> wrote:
> For a PC object like
>
> class Person{
>     String firstName;
>     String lastName;
>     String address;
> }
>
> Currently I can set a named fetch-group in the .jdo file and add it in
> the fetch plan. It would've been great if I would've been able to do
> the following:
>
> Query query = pm.newQuery(Person.class);
> FetchGroup criteria = new FetchGroup();
> criteria.add("firstName").add("lastName");
> query.getFetchPlan().clearGroups().addGroup(fg);
>
> Is there a way I can do something like the above (dynamic fetch
> groups) with the current spec?
> If not, do you think something like this is worth adding to the future
> release of JDO?
> Would be great to have something like this.
>
> I know that I could project some fields using:
> query.setResult("firstName, lastName");
> query.setResultClass(Value.class);
>
> public class Value{
>    String firstName;
>    String lastName;
> }
>
> But the problem here is that Value is not really a PC class.
>
> Any help would be appreciated.
>
> Thanks!
>
> --
> Karan Singh Malhi
>


--
Karan Singh Malhi

[ Post a follow-up to this message ]

Hi Karan,

Currently, there is no standardized way to dynamically define fetch
groups.  We'll look into adding this to the specification.  You might
consider requesting this of your current JDO vendor.

Thanks for your feedback!

Sincerely,
Matthew

On Oct 14, 2007, at 7:43 PM, Karan Malhi wrote:

> Sorry,
>
> The code should read as:
> Query query = pm.newQuery(Person.class);
> FetchGroup criteria = new FetchGroup(Person.class);
> // or I could also do
> // FetchGroup criteria = new FetchGroup(query);
>
> criteria.add("firstName").add("lastName");
> query.getFetchPlan().clearGroups().addGroup(criteria);
>
> On 10/14/07, Karan Malhi <karan.malhi@gmail.com> wrote: 
>
>
> --
> Karan Singh Malhi

[ Post a follow-up to this message ]

A workaround could be to define a fetch group for every single field in
the .jdo file, and then assembling the desired combination at runtime (I
remember somebody having done that before).

Karan Malhi schrieb:
> Sorry,
>
> The code should read as:
> Query query = pm.newQuery(Person.class);
> FetchGroup criteria = new FetchGroup(Person.class);
> // or I could also do
> // FetchGroup criteria = new FetchGroup(query);
>
> criteria.add("firstName").add("lastName");
> query.getFetchPlan().clearGroups().addGroup(criteria);
>
> On 10/14/07, Karan Malhi <karan.malhi@gmail.com> wrote:
> 
>
>
>

[ Post a follow-up to this message ]