Java Doc for HibernateCallback.java in  » J2EE » spring-framework-2.0.6 » org » springframework » orm » hibernate » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.orm.hibernate 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.springframework.orm.hibernate.HibernateCallback

HibernateCallback
public interface HibernateCallback (Code)
Callback interface for Hibernate code. To be used with HibernateTemplate 's execution methods, often as anonymous classes within a method implementation. The typical implementation will call Session.load/find/update to perform some operations on persistent objects. It can also perform direct JDBC operations via Hibernate's Session.connection(), operating on a JDBC Connection.

Note that Hibernate works on unmodified plain Java objects, performing dirty detection via copies made at load time. Returned objects can thus be used outside of an active Hibernate Session without any hassle, e.g. for display in a web GUI. Reassociating such instances with a new Session, e.g. for updates when coming back from the GUI, is straightforward, as the instance has kept its identity. You should care to reassociate them as early as possible though, to avoid having already loaded a version from the database in the same Session.
author:
   Juergen Hoeller
since:
   02.05.2003
See Also:   HibernateTemplate
See Also:   HibernateTransactionManager





Method Summary
 ObjectdoInHibernate(Session session)
     Gets called by HibernateTemplate.execute with an active Hibernate Session.



Method Detail
doInHibernate
Object doInHibernate(Session session) throws HibernateException, SQLException(Code)
Gets called by HibernateTemplate.execute with an active Hibernate Session. Does not need to care about activating or closing the Session, or handling transactions.

If called without a thread-bound Hibernate transaction (initiated by HibernateTransactionManager), the code will simply get executed on the underlying JDBC connection with its transactional semantics. If Hibernate is configured to use a JTA-aware DataSource, the JDBC connection and thus the callback code will be transactional if a JTA transaction is active.

Allows for returning a result object created within the callback, i.e. a domain object or a collection of domain objects. A thrown custom RuntimeException is treated as an application exception: It gets propagated to the caller of the template.
Parameters:
  session - active Hibernate session a result object, or null if none
throws:
  HibernateException - if thrown by the Hibernate API
throws:
  SQLException - if thrown by Hibernate-exposed JDBC API
See Also:   HibernateTemplate.execute
See Also:   HibernateTemplate.executeFind




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