I have a single object with two items in it. I want to write the contents of this object to two differant tables using hibernate, where each table will take a single item from the object.

A simple example is given below

Object contains
name,
address

and the two tables are

name_table
address_table

where name will be written to name_table,
address will be written to address_table

The two tables are having a 1-1 (primary key – foreign key) relationship


My questions are:

1.I would like to know if it is possible to write in such a manner into the DB tables from a single object.

1.If yes
a.will the foreign key also be written to the second table by hibernate automatically or do we have to use some indirect mechanism to do this

b.then could someone possible point out how one should go about writing the mapping file for it

1.Does anyone know if any documentation is available explaining Hibernate mapping files and its syntax and how one can go about writing it from scratch, instead of referring to examples to learn it.

respond to me in piku.mishra@gmail.com

1. Yes, this is possible. There's an element called <join table=...> that does exactly that.

The following example shows the general sketch of your mapping file:



In general, this mapping handles most of what you need.

2. The reference documentation is at http://www.hibernate.org/hib_docs/reference/en/html/index.html. The main reference book is "Hibernate in Action", written by Christian Bauer and Gavin King. Unfortunately, this book refers to Hibernate 2.x, which is somewhat deprecated -- currently we're at Hibernate 3.1. Anyway, the new edition should be published in the next few months.