using the session.delete, can delete one object,but we often want to delete many records and the delete condition may be not the id,but others,how to realize it in hibernate?
thk!

session.delete(query)

Does session.delete(query) internally load all objects before delete like doing "session.get(obj) ... session.delete(obj)" for all objects or does it do a direct "delete from xpto where ..."?

Yes, this is necessary because of things like cascade deltes, lifecycle interfaces, etc.

thks.
is there any solution about update ? if I want to update many redord , I must load the object,and save it one to another,is there other solution?

this is how ORM works...

if you have performance problem on a particular massive update use case, consider coding it in JDBC but be carefull with hibernate session (1st level cache) state and cascade...

I made a little hack lately to make using direct JDBC a bit easier ... don't know it is a good idea though or if it just creates confusion. http://www.gloegl.de/26.html