I have a parent table named A, this table has two one-to-one relation to table B and table C.

Firstly, I mapped this two one-to-one bidirectional relations with cascade="none", and when i insert 1000 columns into these three tables(call save() methods one bye one), the console displays three SQL statements.

Finally, I change these two relations to cascade="all", but when i do same thing(insert 1000 columns for every table), the console displays 3000 SQL statements.

I check the database, the result is OK. but why? is it OK?

thanks.

Its fine. Hibernate caches a single SQL statement in BatcherImpl ;)

gavin, thank you for reply.

Am i right about following?
(1) if i do not use cascade, all object for a table are inserted into database with batch, so the console display a SQL statement.
(2) if i use cascade, when insert a record of the parent table, because of cascade, the hibernate will check all cascade records od the children tables, so the console will display every insert statement.

is it OK?

if so, is it that inserted data with cascade="all" is slower than with cascade="none"?

BTW, when i use cascade="all", when i delete the record of the parent table, there have many select statements before inserted data really.is it fine?

sorry, but how about my question?

ummm

its OK. And no, I don't expect theres any performance diff, as long as you are using a connection pool that implements statement caching.