regards Matthias
Armin Waibel wrote:
[EMAIL PROTECTED] wrote:
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.
put it on my todo-list ;-) Thanks!
regards, Armin
|---------+---------------------------->
| | "Armin Waibel" |
| | <[EMAIL PROTECTED]|
| | g> |
| | |
| | |
| | 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]> |
| |
| cc: |
| Subject: Re: relations and (additional) foreign keys in classes |
>-------------------------------------------------------------------------------------------------------------------------|
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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