>From the Best Practices page:
> Don't treat exceptions as recoverable
>
>I think it would be helpful if Hibernate could guarantee in-memory state
>at least for particular types of failures. In particular, Session.load
>seems useful (and feasible?).
>
>What is driving this request is a need for a simple way to test if many
>rows already exist in a table. It is prohibitive to have to reopen a new
>session every time Session.load fails.
Why not just do
Session.find("from o in class MyClass where o.id=?", .....)
thats basically equivalent to Session.load(), but throws no exceptions....
>I imagine the tricky bit is that the different JDBC drivers throw
>different types of exceptions? But perhaps the hibernate adapters could
>abstract out those differences, for the important types of errors.
Yes, that is one problem.
The other problem is that the Session is heavily re-entrant. So the only
way to guarantee atomicity of operations is to "back up" the state of the
Session before each invocation. I implemented this in an older version but
discovered that the performance cost was absolutely prohibitive (it was
a much larger overhead than you would expect).
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