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Posted to users@openjpa.apache.org by jlawmi <Ja...@gmail.com> on 2009/03/20 22:42:58 UTC
hibernate conversion items
In unit tests (technically integration tests) where I test my mappings, I
used to call (in hibernate)
Hibernate.isInitialized(someentity.property) to validate things were lazy or
to generally check their load status. Also, Hibernate had
Hibernate.initialize(sometntity.property) to programmatically force
initialization. Is there an easy way to do this in openjpa.? I see the
fetchgroups (which are nice), but configuring a fetchgroup seems overkill in
some cases...
Can someone point me to equivalent items in openjpa?
Thanks!
James
--
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Re: hibernate conversion items
Posted by Pinaki Poddar <pp...@apache.org>.
> however this should be a nice to have API in OpenJPA itself.
Yes. JPA 2.0 has defined more elaborate API for similar purpose in
avax.persistence.spi.PersistenceProvider. OpenJPA will implement these
features as part of JPA 2.0 contract.
Nitish Kumar-2 wrote:
>
> Thanks Pinaki,
> I will try to update my code as per your suggestion, however
> this
> should be a nice to have API in OpenJPA itself.
>
> Thanks and Regards,
> Nitish Kumar
>
> On Mon, Mar 23, 2009 at 7:25 PM, Pinaki Poddar <pp...@apache.org> wrote:
>
>>
>> Hi,
>> Following suggestion as per Nitish will work with few caveats.
>> 1. It will not work for detached instances. Because detached instances
>> can
>> not access ClassMetaData.
>> 2. The loop to search through fields can go wrong (because indexing is
>> not
>> one-to-one in all cases) and not necessary if ClassMetaData is available.
>> The correct way is
>> ClassMetaData metaData = sm.getMetaData();
>> FieldMetaData fmd = metaData.getField(property);
>> return sm.getLoaded().get(fmd.getIndex());
>> 3. For detached instance, to get ClassMetaData, one will need somehow to
>> access
>>
>> OpenJPAConfiguration.getMetaDataRepositoryInstance().getCachedMetaData(pc.getClass());
>> then the rest will follow.
>>
>> public static boolean isPropertyLoaded(Object entity, String property) {
>> PersistenceCapable pc = (PersistenceCapable) entity;
>> StateManagerImpl sm = (StateManagerImpl)
>> pc.pcGetStateManager();
>> ClassMetaData metaData = sm.getMetaData();
>> FieldMetaData[] fields = metaData.getFields();
>> int dx = 0;
>> for (int j = 0; j < fields.length; j++) {
>> if (fields[j].getName().equals(property)) {
>> dx = j;
>> break;
>> }
>> }
>> return sm.getLoaded().get(dx);
>> }
>>
>> jlawmi wrote:
>> >
>> >
>> > Thanks Nitish. In hibernate calling a getter doesn't force
>> initialization,
>> > at least on many-one fields, but I'll try it out. Since openjpa doesn't
>> > use cglib that makes sense.
>> >
>> > --James
>> >
>>
>>
>> -----
>> Pinaki Poddar http://ppoddar.blogspot.com/
>>
>> http://www.linkedin.com/in/pinakipoddar
>> OpenJPA PMC Member/Committer
>> JPA Expert Group Member
>> --
>> View this message in context:
>> http://n2.nabble.com/hibernate-conversion-items-tp2511309p2521187.html
>> Sent from the OpenJPA Users mailing list archive at Nabble.com.
>>
>>
>
>
-----
Pinaki Poddar http://ppoddar.blogspot.com/
http://www.linkedin.com/in/pinakipoddar
OpenJPA PMC Member/Committer
JPA Expert Group Member
--
View this message in context: http://n2.nabble.com/hibernate-conversion-items-tp2511309p2521552.html
Sent from the OpenJPA Users mailing list archive at Nabble.com.
Re: hibernate conversion items
Posted by Nitish Kumar <ni...@gmail.com>.
Thanks Pinaki,
I will try to update my code as per your suggestion, however this
should be a nice to have API in OpenJPA itself.
Thanks and Regards,
Nitish Kumar
On Mon, Mar 23, 2009 at 7:25 PM, Pinaki Poddar <pp...@apache.org> wrote:
>
> Hi,
> Following suggestion as per Nitish will work with few caveats.
> 1. It will not work for detached instances. Because detached instances can
> not access ClassMetaData.
> 2. The loop to search through fields can go wrong (because indexing is not
> one-to-one in all cases) and not necessary if ClassMetaData is available.
> The correct way is
> ClassMetaData metaData = sm.getMetaData();
> FieldMetaData fmd = metaData.getField(property);
> return sm.getLoaded().get(fmd.getIndex());
> 3. For detached instance, to get ClassMetaData, one will need somehow to
> access
>
> OpenJPAConfiguration.getMetaDataRepositoryInstance().getCachedMetaData(pc.getClass());
> then the rest will follow.
>
> public static boolean isPropertyLoaded(Object entity, String property) {
> PersistenceCapable pc = (PersistenceCapable) entity;
> StateManagerImpl sm = (StateManagerImpl)
> pc.pcGetStateManager();
> ClassMetaData metaData = sm.getMetaData();
> FieldMetaData[] fields = metaData.getFields();
> int dx = 0;
> for (int j = 0; j < fields.length; j++) {
> if (fields[j].getName().equals(property)) {
> dx = j;
> break;
> }
> }
> return sm.getLoaded().get(dx);
> }
>
> jlawmi wrote:
> >
> >
> > Thanks Nitish. In hibernate calling a getter doesn't force
> initialization,
> > at least on many-one fields, but I'll try it out. Since openjpa doesn't
> > use cglib that makes sense.
> >
> > --James
> >
>
>
> -----
> Pinaki Poddar http://ppoddar.blogspot.com/
>
> http://www.linkedin.com/in/pinakipoddar
> OpenJPA PMC Member/Committer
> JPA Expert Group Member
> --
> View this message in context:
> http://n2.nabble.com/hibernate-conversion-items-tp2511309p2521187.html
> Sent from the OpenJPA Users mailing list archive at Nabble.com.
>
>
RE: hibernate conversion items
Posted by Pinaki Poddar <pp...@apache.org>.
Hi,
Following suggestion as per Nitish will work with few caveats.
1. It will not work for detached instances. Because detached instances can
not access ClassMetaData.
2. The loop to search through fields can go wrong (because indexing is not
one-to-one in all cases) and not necessary if ClassMetaData is available.
The correct way is
ClassMetaData metaData = sm.getMetaData();
FieldMetaData fmd = metaData.getField(property);
return sm.getLoaded().get(fmd.getIndex());
3. For detached instance, to get ClassMetaData, one will need somehow to
access
OpenJPAConfiguration.getMetaDataRepositoryInstance().getCachedMetaData(pc.getClass());
then the rest will follow.
public static boolean isPropertyLoaded(Object entity, String property) {
PersistenceCapable pc = (PersistenceCapable) entity;
StateManagerImpl sm = (StateManagerImpl)
pc.pcGetStateManager();
ClassMetaData metaData = sm.getMetaData();
FieldMetaData[] fields = metaData.getFields();
int dx = 0;
for (int j = 0; j < fields.length; j++) {
if (fields[j].getName().equals(property)) {
dx = j;
break;
}
}
return sm.getLoaded().get(dx);
}
jlawmi wrote:
>
>
> Thanks Nitish. In hibernate calling a getter doesn't force initialization,
> at least on many-one fields, but I'll try it out. Since openjpa doesn't
> use cglib that makes sense.
>
> --James
>
-----
Pinaki Poddar http://ppoddar.blogspot.com/
http://www.linkedin.com/in/pinakipoddar
OpenJPA PMC Member/Committer
JPA Expert Group Member
--
View this message in context: http://n2.nabble.com/hibernate-conversion-items-tp2511309p2521187.html
Sent from the OpenJPA Users mailing list archive at Nabble.com.
RE: hibernate conversion items
Posted by jlawmi <Ja...@gmail.com>.
Thanks Nitish. In hibernate calling a getter doesn't force initialization,
at least on many-one fields, but I'll try it out. Since openjpa doesn't use
cglib that makes sense.
--James
--
View this message in context: http://n2.nabble.com/hibernate-conversion-items-tp2511309p2517170.html
Sent from the OpenJPA Users mailing list archive at Nabble.com.
RE: hibernate conversion items
Posted by Nitish Kumar <Ni...@proteans.com>.
Hi James,
I don't remember reading about any such API in OpenJpa (some body please correct me if there is one), but getting that information should not be that difficult. I just wrote a little API which would get you the information, if the property has been loaded or not. Based on my really simple tests, the API works fine. If you want you can use it for your tests.
public static boolean isPropertyLoaded(Object entity, String property) {
PersistenceCapable pc = (PersistenceCapable) entity;
StateManagerImpl sm = (StateManagerImpl) pc.pcGetStateManager();
ClassMetaData metaData = sm.getMetaData();
FieldMetaData[] fields = metaData.getFields();
int dx = 0;
for (int j = 0; j < fields.length; j++) {
if (fields[j].getName().equals(property)) {
dx = j;
break;
}
}
return sm.getLoaded().get(dx);
}
For forcing initialization you can just call the getter method. I am sure there are better ways of getting the same information, but this is based on my very limited knowledge of OpenJPA.
Thanks and Regards,
Nitish Kumar
-----Original Message-----
From: jlawmi [mailto:JamesJLaw@gmail.com]
Sent: Sat 3/21/2009 3:12 AM
To: users@openjpa.apache.org
Subject: hibernate conversion items
In unit tests (technically integration tests) where I test my mappings, I
used to call (in hibernate)
Hibernate.isInitialized(someentity.property) to validate things were lazy or
to generally check their load status. Also, Hibernate had
Hibernate.initialize(sometntity.property) to programmatically force
initialization. Is there an easy way to do this in openjpa.? I see the
fetchgroups (which are nice), but configuring a fetchgroup seems overkill in
some cases...
Can someone point me to equivalent items in openjpa?
Thanks!
James
--
View this message in context: http://n2.nabble.com/hibernate-conversion-items-tp2511309p2511309.html
Sent from the OpenJPA Users mailing list archive at Nabble.com.
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