Can you tell me which provider can do this ???
David
Marina Vatkina wrote:
>
> There is no portable way to support ManyToMany relationships with an extra
> attribute. Some providers can do it in their own way. For a portable
> solution,
> you need to map them as 2 OneToMany relationships with an Entity that
> represents
> that extra attribute.
>
> Regards,
> -marina
>
> PLC_David wrote:
>> Hello Gordon,
>>
>> I don't understand it :confused:. I've deleted @Entity in the
>> ShoppingCartPropertiesDTO, but how is the @manytomany
>> in CustomerDTO ??
>>
>> If I have the ShoppingCartPropertiesDTO without the @Entity than I get
>> following exception:
>>
>> Exception Description: Missing descriptor for
>> [ShoppingCartPropertiesDTO].
>> Verify that the descriptor has been properly registered with the Session.
>>
>> Could you write what you mean, please ?
>>
>>
>>
>> Gordon Yorke wrote:
>>
>>>Hello,
>>> Yes you can map the ShoppingCartPropertiesDTO using the @ManyToMany
>>>annotation. The ShoppingCartPropertiesDTO will have to be marked as an
>>>Entity. Not marking the ShoppingCartPropertiesDTO as an Entity is most
>>>likely the cause of the exception you are seeing.
>>>--Gordon
>>>
>>>-----Original Message-----
>>>From: PLC_David [mailto:spaceman2k4_at_gmx.de]
>>>Sent: Monday, September 17, 2007 7:12 PM
>>>To: persistence_at_glassfish.dev.java.net
>>>Subject: ManyToMany with list of an utility class which contains the
>>>other objekt fur mapping and an additional attribute
>>>
>>>
>>>
>>>Hallo, I work with JPA for the first time.
>>>
>>>My database:
>>>
>>>Customer : ID | NAME | other columns
>>>Product : ID | DISCRIMINATOR | NAME |other columns | HARDWARE_INTERFACE
|
>>>XML_ID
>>>Customer_Product_Rel: CUSTOMER_ID | PRODUCT_ID | AMOUNT
>>>
>>>My objects:
>>>
>>>@Entity
>>>CustomerDTO: attributes like id, name ... and
>>>List<ShoppingCartPropertiesDTO> products = new
>>>ArrayList<ShoppingCartPropertiesDTO>();
>>>
>>>ShoppingCartPropertiesDTO: private ProductDTO product = null; private
>>>Integer amount = null;
>>>
>>>@Entity
>>>@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
>>>@DiscriminatorColumn(name = "DISCRIMINATOR", discriminatorType =
>>>DiscriminatorType.STRING, length = 2)
>>>abstract class Product: id, name ,descr, ...
>>>
>>>@Entity(name="SoftwareDTO")
>>>@DiscriminatorValue("SW")
>>>public class SoftwareDTO extends ProductDTO: private
SystemRequirementsDTO
>>>systemRequirements = null; private String language = null;
>>>
>>>
>>>My question: Can I map the customer with a list of the additional object
>>>(ShoppingCartPropertiesDTO) which contains the product and the amount?
And
>>>how is the ManyToMany annotation ?
>>>
>>>
>>>
>>>An additional question: What means the exception with missing descriptor
>>>??
>>>
>>>Exception Description: Missing descriptor for
[ShoppingCartPropertiesDTO].
>>>Verify that the descriptor has been properly registered with the Session.
>>> at
>>>oracle.toplink.essentials.internal.ejb.cmp3.transaction.base.EntityTransactionImpl.commit(EntityTransactionImpl.java:120)
>>> at
>>>oracle.toplink.essentials.internal.ejb.cmp3.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:60)
>>> at test.JPATester.runTest2(JPATester.java:186)
>>>Caused by: Exception [TOPLINK-7009] (Oracle TopLink Essentials - 2.0
>>>(Build
>>>b58g-fcs (09/07/2007))):
>>>oracle.toplink.essentials.exceptions.ValidationException
>>>
>>>
>>>
>>>Thanks for all posts
>>>David
>>>
>>>
>>>
>>>--
>>>View this message in context:
>>>http://www.nabble.com/ManyToMany-with-list-of-an-utility-class-which-contains-the-other-objekt-f%C3%BCr-mapping-and-an-additional-attribute-tf4470610.html#a12746960
>>>Sent from the java.net - glassfish persistence mailing list archive at
>>>Nabble.com.
>>>
>>>
>>
>>
>
>
--
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