6, ORM
(1) ORM
l ORM: Object-translational mapping
l Built-in support:
Ø jdo
Ø Ø Ibatis
Ø hibernate
(2) Hibernate configuration
l Define DataSource and Hibernate SessionFactory
(3) HibernateTemplate
l Create hibernateTemplate
SessionFactory sessionFactory = (sessionFactory) CTX.getBean ("sessionFactory");
HibernateTemplate Hibernate = new hibernateTemplate (sessionFactory);
l Loading and updating
Employee E = (Employee) Hibernate.Load (Employee.class, "000330");
E.SetFirstName ("Bob");
Hibernate.Update (e);
l Use convenient method to query
List Employees = Hibernate.Find ("from app.employee");
List list = hibernate.find
"from app.employee e where e.lastname =?",
"Lee",
Hibernate.string;
List list = hibernate.find
"from app.employee e where e.lastname =? and E.FIRSTNAME =?",
New string [] {"bob", "lee"}
New type [] {hibernate.string, hibernate.string});
l Use the callback method to query
List list = (list) hibernate.execute (new hibernateCallback () {public object Doinhibernate (session session)
Throws HibernateException {
List result = session.find ("from app.employee");
// do some further stuff with the result list
Return Result;
}
});
(4) Abnormal processing
l Pass hibernate is abnormal to the DataAccessException layer
l uses the same strategy as JDBC
