Re: [ojb-users] Problems with Foreign-Key

[Thomas M. <tho...@ho...>]

Hi Joerg,

Mhh, this is a starange behaviour, as there are testcase, that prrof 
that automatic assignment works.

Also, your mapping seems OK!

You could try the following:

set <autoincrement>true</autoincrement> in the mapping of the primary 
key of EObject.

before storing your eObject,
just compute its Identity by
Identity oid = new Identity(eObject);

now eObjects primary is set!

than store eObject.

I hope this will solve your problem,

Thomas

Jörg Benne wrote:

> Hi,
> 
> I have a quite simple problem:
> 
> My Sample has two Classes, eObject and attribute, with one eObject
> having several attributes and 1 attribute belong to one eObject.
> 
> The Mapping...
> 
>    <ClassDescriptor id="1">
>       <class.name>com.eobjects.EObject</class.name>
>       <table.name>eobject</table.name>
>       <FieldDescriptor id="1">
>          <field.name>ID</field.name>
>          <column.name>ID</column.name>
>          <jdbc_type>INTEGER</jdbc_type>
>          <PrimaryKey>true</PrimaryKey>
>        </FieldDescriptor>
> ...
>       <CollectionDescriptor id="1">
>          <cdfield.name>attributes</cdfield.name>
>          <items.class>com.eobjects.Attribute</items.class>
>          <inverse_fk_descriptor_ids>5</inverse_fk_descriptor_ids>
>          <auto.update>true</auto.update>
>       </CollectionDescriptor>
>    </ClassDescriptor>
> <ClassDescriptor id="2">
>       <class.name>com.eobjects.Attribute</class.name>
>       <table.name>attribute</table.name>
>       <FieldDescriptor id="1">
>          <field.name>ID</field.name>
>          <column.name>ID</column.name>
>          <jdbc_type>INTEGER</jdbc_type>
>          <PrimaryKey>true</PrimaryKey>
>       </FieldDescriptor>
> ...
>       <FieldDescriptor id="5">
>          <field.name>eObjectID</field.name>
>          <column.name>objID</column.name>
>          <jdbc_type>INTEGER</jdbc_type>
>       </FieldDescriptor>
>       <ReferenceDescriptor id="1">
>          <rdfield.name>eObject</rdfield.name>
>          <referenced.class>com.eobjects.EObject</referenced.class>
>          <fk_descriptor_ids>5</fk_descriptor_ids>
>       </ReferenceDescriptor>
>    </ClassDescriptor>
> 
> When I create an eObject and set it's attributes Vector and store it (I just
> call broker.store(eObject), the ID is given by Database (OJB sends a select
> to get
> it)) ), both eObject and attributes are saved, BUT
> the Value ob objID in Table Attribute is 0 althought the eObject it belongs
> to has received the ID 2. So I can't find my attributes when I reload my
> eObject.
> But I can't set the foreign-key by myself, as I don't know it until a new
> eObject is
> saved for the first time.
> 
> What's wrong?
> 
> Joerg
> 
> 
> 
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