Hi guys,

Let say I have 1 to 1 mapping between two objects Body and Head

is there a more efficient way when setting Body to the head than load Head fist and vice versa ?

so :
1. Load Body
2. Load new Head
3. Set new Head to the Body
4. store Body
-----what I want-----
I know PK of Head
so
1. Load Body
2. Somehow set PK for new Head to the Body
3. Store Body

Cheers

Assuming that you not have disabled proxies for your classes, you can use Session.load() to load the Head. This will not hit the database. It will only create a proxy for Head with the given ID value.

Well,

does it depends on lazy settings as well ? Or are you saying that when I do Session.load() never hits the database ? What if the object with specified ID does not exists ?

Cheers

right I see ... should use Session.get if want to be sure it exists ... thanks

lazy=true means that proxies are enabled, lazy=false means that proxies are disabled. If proxies are disabled I think Session.load() will hit the database and throw an exception if it doesn't exists (Session.get() returns null instead). If proxies are enabled Session.load() will return a proxy without checking the database. If it doesn't exists you may get an error later on depending on what you do.

Using Session.get() will be like the 4-step sequence in the original post.

Using Session.load() will be like the 3-step sequence in the original post.

thx