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From Daryl Stultz <da...@6degrees.com>
Subject Lazy loading
Date Tue, 02 Feb 2010 01:56:28 GMT
Hello,

I am investigation iBatis as an alternative to JPA/OpenJPA. JPA states that
the behavior of the provider in the case of accessing unloaded fields on a
"detached" object is "unspecified". OpenJPA returns null or throws an
exception depending on the configuration. Considering the test case below,
it appears that iBatis can lazy load fields outside of the session that
instantiated it. Is this true or have I misinterpreted my code? If it can
lazy load after the session is closed, that would be AWESOME! That would
mean that eager loading is merely an optimization and not a requirement for
object manipulation that takes place over multiple "user interactions". If
it's true, exactly how does it work? I'm using CGLIB. Does the enhanced
class keep a reference to the original DataSource for getting a new
connection? Or is there some ThreadLocal work going on? Do I need to extend
my test case to spin up another Thread? Thanks.

UserType ut = *new* UserType();

ut.setName("doctor");

UserTypeMapper utm = session.getMapper(UserTypeMapper.*class*);

utm.insert(ut);

session.commit();

*assertNotNull*(ut.getId());

 User user = *new* User();

user.setName("Fred");

user.setUserType(ut);

UserMapper um = session.getMapper(UserMapper.*class*);

um.insert(user);

session.commit();

*assertNotNull*(user.getId());

 session.close();

 session = factory.openSession();

 um = session.getMapper(UserMapper.*class*);

user = um.findById(user.getId());

 session.close();

 *assertEquals*("Fred", user.getName());

*assertNotNull*(user.getUserType()); // lazy loading

*assertEquals*("doctor", user.getUserType().getName());

*assertEquals*(ut.getId(), user.getUserType().getId());


-- 
Daryl Stultz
_____________________________________
6 Degrees Software and Consulting, Inc.
http://www.6degrees.com
mailto:daryl@6degrees.com

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