no success in using merge(), no exceptions of any sort but nothing gets
updated or removed.
still looking for help.
thank you!
p7k wrote:
>
> Mike,
>
> Thank you for your reply. Any help is much appreciated. But I'm having
> hard time translating your reply to my problem. Let me a little more
> specific:
>
> 1. my Customer details form (view) allows for editing properties other
> than the DistDay.
>
> 2. "e.g. adding a new day of the week to the list, then make sure you
> load the
> day of the week from Hibernate before adding it to the list" - but these
> a simple value type enums, they might as well be integers, they are not
> stored anywhere how would i go about loading them from hibernate?
>
> 3. could you elaborate on the use of merge(), especially in my case.
> what do you mean "use the object returned from merge(), since all i want
> to do with that object is either save or update it after the CustomerForm
> has set all customer fields?
>
> 4. i don't have a DayOfWeekDao, since they are value types.
> But, i do use customer = customerDao.saveCustomer(customer); , following
> the appfuse's CRUD tutorials.
>
>
> Sorry, i'm a noob, i know ...
>
>
>
>
>
> Mike Horwitz wrote:
>>
>> On 8/23/07, p7k <[EMAIL PROTECTED]> wrote:
>>>
>>>
>>> Please, help me learn !!!
>>>
>>> I have the following situation:
>>>
>>> a Customer class with a collection of enums which represent weekdays {
>>> Sun,
>>> Mon , Tue , ... }
>>> ( in JSF, I bind these to a UISelectMany component - checkboxes )
>>>
>>> @Entity
>>> public class Customer extends BaseLocation implements Serializable {
>>> ...
>>> private List<DaysOfWeek> distDays = new ArrayList<DaysOfWeek>();
>>>
>>> @CollectionOfElements( targetElement = DaysOfWeek.class )
>>> @JoinTable( name = "Customer_DistDay" )
>>> @Enumerated( EnumType.STRING )
>>> @Column(name = "distDay", nullable = false)
>>> public List<DaysOfWeek> getDistDays() { return distDays; }
>>>
>>> public void setDistDays(List<DaysOfWeek> distDays) { this.distDays =
>>> distDays; }
>>> ...
>>> }
>>>
>>> I also have a CustomerForm action which is modeled exactly like
>>> appfuse's
>>> UserForm:
>>> * edit() to initialize the backBean to an existing customer if (id !=
>>> null)
>>> or to a new customer;
>>> * save(), which calls customer = customerDao.saveCustomer(customer) -
>>> saveOrUpdate() with a flush();
>>> * remove() calls remove from GenericDaoHibernate.
>>>
>>> I have been battling a long time to get the LazyLoading working:
>>> * First, I enabled
>>> org.springframework.orm.hibernate3.support.OpenSessionInViewFilter for
>>> everything in my path:
>>> This got me the viewing power both in CustomerList and CustomerForm.
>>> Nayice!
>>> I can "add" a new Customer.
>>> I can't "update" (NonUniqueObjectException: a different object with the
>>> same identifier value was already associated with the session ... )
>>> I can't "delete"
>>> (org.springframework.dao.InvalidDataAccessApiUsageException: Write
>>> operations are not allowed in read-only mode (FlushMode.NEVER/MANUAL)
>>> ...
>>> )
>>>
>>> * Second, without much thinking/understanding, I extended my
>>> org.springframework.orm.hibernate3.support.OpenSessionInViewFilter with
>>> the
>>> recommended flush strategy from
>>> http://wiki.apache.org/myfaces/Hibernate_And_MyFaces
>>> http://wiki.apache.org/myfaces/Hibernate_And_MyFaces (it uses
>>> FlushMode.COMMIT):
>>> Now I got the views, "create" and "remove" working. SWELL
>>>
>>> BUT "update" does not work (NonUniqueObjectException: a different object
>>> with the same identifier value was already associated with the session
>>> ...
>>> ).
>>>
>>> I suppose it's because the session, which contained it, no longer
>>> exists.
>>> So, hibernate thinks I'm being stupid, maybe I am.
>>
>>
>> Usually the exception is thrown because the Session has previously loaded
>> an
>> object with the same id and you are trying to save a new, disconnected
>> instance with exactly the same id. There are several ways to tackle this
>> (best approach is largely determined by what goes on in your
>> view/controller):
>>
>> 1) If all you are doing is adding objects to a list as part of your
>> update,
>> e.g. adding a new day of the week to the list, then make sure you load
>> the
>> day of the week from Hibernate before adding it to the list. That should
>> make sure it knows the object you are trying to save is already
>> associated
>> with the session.
>> 2) Use merge() rather than saveOrUpdate() as the method used to drive the
>> update in your DAO. Just be careful here - you MUST use the object
>> returned
>> from the merge() method once it has been called, which means returning an
>> object from your save method:
>>
>> e.g:
>>
>> DayOfWeek dayOfWeek = new DayOfWeek();
>> dayOfWeek = dayOfWeekDao.save(dayOfWeek);
>> ... continue using dayOfWeek instance.
>>
>> Mike
>>
>> Please, help !!
>>> --
>>> View this message in context:
>>> http://www.nabble.com/hibernate%3A-Lazy-Loading-101-tf4316007s2369.html#a12289186
>>> Sent from the AppFuse - User mailing list archive at Nabble.com.
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: [EMAIL PROTECTED]
>>> For additional commands, e-mail: [EMAIL PROTECTED]
>>>
>>>
>>
>>
>
>
--
View this message in context:
http://www.nabble.com/hibernate%3A-Lazy-Loading-101-tf4316007s2369.html#a12303838
Sent from the AppFuse - User mailing list archive at Nabble.com.
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
