two attributes composing a key

Ot · **Posted:** Fri Dec 26, 2003 3:33 pm

how to write a mapping so i can have a table where a pair of attributes can't be repeated? for instance, the 2-upla (name, parent) can't be repeated, even if "name" can be repeated, and "parent" can be repeated, but the groupt of two can't.
Thanks

Ot

david · **Posted:** Fri Dec 26, 2003 8:13 pm

Check out the manual. Your question is answered in the section on composite keys http://www.hibernate.org/hib_docs/reference/html/or-mapping.html#or-mapping-s1-4b

eg,

Code:

<composite-id>
        <key-property name="name"/>
        <key-property name="parent"/>
</composite-id>

Ot · **Posted:** Sat Dec 27, 2003 1:20 pm

In fact, i have to say i did not undestand a thing about this mapping technique. The docs seem to resumed to me.
If someone has a good example on that approach, please show me.

Thanks a lot.

timvogel · **Posted:** Sat Dec 27, 2003 10:42 pm

Ot · **Posted:** Sat Dec 27, 2003 10:47 pm

I've heard some about this tool, but never used it. I'm gonna take some time and study it. thanks a lot. if that worked for you, that means it can be a nice way.

Thanks