Hi All,

I auto-generated by Hibernate mapping files from an existing MySQL schema. Each of the mapping files specifies the id as:
<generator class="assigned"/>.
My code works best when I use the 'native' generator however to match the fact that MySQL auto generates a new id when a new row is inserted.

So my question is when would you use assigned over native?

Thanks,
Fred

Hi,

along with "assigned" and "native" there are many other generator types, see
http://docs.jboss.org/hibernate/core/3.3/reference/en/html/mapping.html
chapter 5.1.4.1. Generator



Yes, 'native' generator is very comfortable for this purpose.
Anyway this approach has some serious disadvantages:
1. Performance:
With 'native' generator the row is inserted immediately when persisting a new object.
With the other approaches the inserts are deferred to the flush/commit action and can benefit from the batching feature.
2. Traceability: when enabling sql-logging with 'native' generator you cannot see with which ID the new persisted object was inserted into database.