how to concat 2 columns and use ad "id" in hibernate mapping

for example, in my table, i have field1 and field2 .i want to concat both fields and use as primary key. what syntax should i put in .xm file ?


<id name="field1, field2"> //is this correct?

</id>

Never heard of that techinque.
Howeverm, you can set your id as "assigned" and concatenate these 2 fields in your code , or using the HQL concat() function.

a Custom Type will help, see reference or test package of Hibernate source