As a side issue on documentation. I read this article on how to use
anonymous keys and I was left totally at a loss on what the associated code
should loook like. Maybe a little example would be useful.
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| | "Armin Waibel" |
| | <[EMAIL PROTECTED]|
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| | 02-Apr-2004 11:29|
| | Please respond to|
| | "OJB Users List" |
| | <[EMAIL PROTECTED]|
| | he.org> |
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| To: "OJB Users List" <[EMAIL PROTECTED]>
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| cc:
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| Subject: Re: relations and (additional) foreign keys in classes
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Hi Matthias,
for 1:1 relation OJB has a feature called 'anonymous key'
http://db.apache.org/ojb/howto-use-anonymous-keys.html
<field-descriptor
name="refFK"
column="REF_FK"
jdbc-type="INTEGER"
access="anonymous" />
Thus you don't need to declare the FK in your class, only in metadata
and DB.
For single JVM 2-tier (no serialized persistent capable objects)
projects it is possible use this concept for other fields too (not only
1:1 references) - again, only in this case (OJB use in a object identity
based map for these anonymous fields).
regards,
Armin
Matthias Gottschlich wrote:
> Hi there,
>
> we are coming from j2ee-cmp and want to change to another o/r-mapping
> tool (perhaps ojb).
> In the Documentation i read, that i have to declare the foreign key as
> an extra member of my class, if i want to use a reference to the other
> class.
> Is this necessary? I came from EJB-CMP/CMR. There is no need to declare
> the foreign keys as class members. This is declared in the deployments
> descriptors and the mapping-definitions in the application servers. IS
> there a workaround to avoid the definition of foreign key class members?
>
> regards
> Matthias
>
>
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