about hibernate unidirectional and bidirectional

hi i have little experience with orm.could you please tell me what is unidirectional assosiation and birectional assosiation ?when it is rewuired to use in our application?

vasu chowdary wrote:hi i have little experience with orm.could you please tell me what is unidirectional assosiation and birectional assosiation ?when it is rewuired to use in our application?

Unidirectional and bidirectional refer to which objects know about each other. For example, if I have a reference to you and you don't, it is unidirectional. If we both have references, it is bidirectional. It is never required to use either. What is best depends on your application/domain/usage.

thank you very much jeany