(Quick Reference)
isAttached
目的
Purpose
Returns whether the domain instance is attached to a currently active Hibernate session. This method is often used on conjunction with the
merge or
attach methods.
使用例
Examples
Book b = session.book
…
if (!b.isAttached()) {
b.attach()
}詳細
Description
Persistent instances are associated with a persistence Session. A new Session is created for each request and is closed at the end of the request. If an object is read from the session and placed into a web scope such as the HttpSession it is seen as detached, since the persistence session has been closed. You can use the
attach method to re-attach an existing persistent instance to the persistence session of the current request.
