Hi,

I have a table which has two columns as primary key.
How should I composite keys in Hibernate mappings file.

I saw this section in Hibernate Documentation.

"There is an alternative <composite-id> declaration to allow access to legacy data with composite keys. We
strongly discourage its use for anything else."

What does this statement mean. What will be the consequences of using <composite-id>. IS there an alternative way to do this.


Thanking You.
Chamal.

Chamal,

I believe the "alternative approach" implied here is simply use of a single-column primary key. There is further discussion in:

http://www.hibernate.org/hib_docs/reference/en/html/components.html#components-compositeid

I've used composite-id tags in my mapping files without issue. Updates are less efficient. However, upating does seem to work for me. I'm using the "separate class" approach described by the hibernate team.

If your table is just a read-only table, you probably won't have a problem.