我对以下示例有疑问:
package org.andrea.myexample.HibernateOnSpring.dao;
import java.util.List;
import org.andrea.myexample.HibernateOnSpring.entity.Person;
import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
import org.springframework.transaction.annotation.Transactional;
public class PersonDAOImpl implements PersonDAO {
// Factory per la creazione delle sessioni di Hibernate:
private static SessionFactory sessionFactory;
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
// CREATE CRUD Operation:
@Transactional(readOnly = false)
public Integer addPerson(Person p) {
System.out.println("Inside addPerson()");
Session session = sessionFactory.openSession();
Transaction tx = null;
Integer personID = null;
try {
tx = session.beginTransaction();
personID = (Integer) session.save(p);
tx.commit();
} catch (HibernateException e) {
if (tx != null)
tx.rollback();
e.printStackTrace();
} finally {
session.close();
}
return personID;
}
// READ CRUD Operation (legge un singolo record avente uno specifico id):
public Person getById(int id) {
System.out.println("Inside getById()");
Session session = sessionFactory.openSession();
Transaction tx = null;
Person retrievedPerson = null;
try {
tx = session.beginTransaction();
retrievedPerson = (Person) session.get(Person.class, id);
tx.commit();
}catch (HibernateException e) {
if (tx != null)
tx.rollback();
e.printStackTrace();
} finally {
session.close();
}
return retrievedPerson;
}
// READ CRUD Operation (recupera la lista di tutti i record nella tabella):
@SuppressWarnings("unchecked")
public List<Person> getPersonsList() {
System.out.println("Inside getPersonsList()");
Session session = sessionFactory.openSession();
Transaction tx = null;
List<Person> personList = null;
try {
tx = session.beginTransaction();
Criteria criteria = session.createCriteria(Person.class);
personList = criteria.list();
System.out.println("personList: " + personList);
tx.commit();
}catch (HibernateException e) {
if (tx != null)
tx.rollback();
e.printStackTrace();
} finally {
session.close();
}
return personList;
}
// DELETE CRUD Operation (elimina un singolo record avente uno specifico id):
public void delete(int id) {
System.out.println("Inside delete()");
Session session = sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
Person personToDelete = getById(id);
session.delete(personToDelete);
tx.commit();
}catch (HibernateException e) {
if (tx != null)
tx.rollback();
e.printStackTrace();
} finally {
session.close();
}
}
@Transactional
public void update(Person personToUpdate) {
System.out.println("Inside update()");
Session session = sessionFactory.openSession();
Transaction tx = null;
try {
System.out.println("Insite update() method try");
tx = session.beginTransaction();
session.update(personToUpdate);
tx.commit();
}catch (HibernateException e) {
if (tx != null)
tx.rollback();
e.printStackTrace();
} finally {
session.close();
}
}
}
在此示例中,我使用的是 JPA API 还是 Hibernate API...使用的注释属于 JPA 还是属于 Hibernate?
Tnx
安德里亚
最佳答案
导入表明:两者都不是。
org.springframework.transaction.annotation.Transactional
这是一个适用于 Hibernate 或 JPA 的 Spring 注释。 JTA API 独立于您选择的 ORM 解决方案。
其余的导入均引用 Hibernate。
我可以理解您的困惑:JPA 是一个独立于您选择的 ORM 解决方案的 API。 Hibernate 是一种实现。
关于java - 我使用的是 JPA API 还是 Hibernate API?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15293355/