How can i have a combination of properties as unique

jothiprasadh · **Joined:** Mon Dec 11, 2006 1:06 am **Posts:** 5

Hi ,

Is it possible to have a combination of properties as unique ??

For ex : Consider name ,company name are separate properties.

Is it possible to have name and company name combined together as unique??? How can i specify in mapping ???

Thanks in Advance

batmat · **Posted:** Mon Dec 11, 2006 1:58 am

Good question, I'm not sure it's possible. Maybe yes if you map your three properties as one component, then redefine equals/hashCode so as to compare your objects equality the way you want ?

jothiprasadh · **Joined:** Mon Dec 11, 2006 1:06 am **Posts:** 5

Hi ,

There is another option in addition to your answer .You can use composite key also..

Thanks a lot :)

batmat · **Posted:** Mon Dec 11, 2006 8:38 am

jothiprasadh wrote:

There is another option in addition to your answer. You can use composite key also..

Yes, but you didn't say that those properties were keys or your class, that's why I didn't speak about composite-id. By the way, note that it's said to be better to map a component as a composite key instead of mapping many fields as belonging to the key. I'm not sure I'm very clear :-).