i have 2 tables, tbl_thread and tbl_message. in tbl_message there is one column 'threadId' which is a FK to tbl_thread 'id' column.
A thread could have many messages tagged to it.
so how do i do the mapping?? and how should i get the value for the 'threadId' column?

thanks.

Do you want this relationship to be unidirectional or bidirectional? If I'm right, you're managing some king of forum or something like that.

If so, it seems to me it would make sense to map a List (or Set) of Messages in a Thread. So a parent relationship should do what you want.

Map a List (see bag) or Set (set) mappings and map the many-to-one reverse relation if you want.

Please read the reference documentation: http://www.hibernate.org/hib_docs/v3/re ... child.html

i have another question. if for example, i have 2 class file: reply and message. reply will inherit from message. so how do i do the mapping? Message could have the following attribute: id, messageId, creationDate. Reply could have the following attribute: modifiedDate, and it will take the message's id and messageId attribute. How do i do the mapping for the both class? thanks.

See reference documentation http://www.hibernate.org/hib_docs/v3/re ... tance.html

If you have problem using it, then come back :)

i have seen this website before. but i don't quit understand. could u do a simple explanation.

my doubt:
1) there is only 1 mapping file needed? the mapping file is based on the parent?
2) the subclass is the child?
3) what is discriminator-value?

Better read the documentation about the different strategy of mappings. Moreover, to understand those solutions, you should think about how you would map inheritance inside an RDBMS.


The child of what? Are you speaking about child in inheritance or in a composition relationship?


This is one part of one solution to map inheritance. For example, you can decide to map all persons to a single table. Hibernate will then use this field to know if the row is a women or a man, say.