所以我做了一个简单的hibernate应用程序,并使用HibernateUtil静态方法启动了一个SessionFactory,它提供了一个合适的会话。
问题是 - 我如何坚持使用此代码?而且我更加困惑的是如何从这个设计中构建出来,为我的每个对象需要合并HibernateUtil?
package com.hibernation.main;
import com.hibernation.model.Animal;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
/**
* Created by jonathan on 27/12/16.
*/
public class Earth {
public static void main(String[] args){
Animal a = new Animal(1,"lizard", "gekko", "test");
HibernateUtil();
}
public static void HibernateUtil(){
// create configuration instance and pass in the
// hibernate configuration file.
Configuration configuration = new Configuration();
configuration.configure("hibernate.cfg.xml");
// version 4.x and up, service registry is being used.
// The ServiceRegistry scopes the Service.
// The ServiceRegistry manages the lifecycle of the Service.
// The ServiceRegistry handles injecting dependencies into the Service
// (actually both a pull and a push/injection approach are supported).
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
// create a Session factory instance: session factory creates sessions
// at the request of clients.
// conceptually, this is a single data store that is thread safe.
// should be wrapped in a singleton (HibernateUtil being a common convention)
// the internal state is immutable - once it is created the state is set.
SessionFactory factory = configuration.buildSessionFactory(serviceRegistry);
// get the current session.
Session session = factory.getCurrentSession();
// begin transaction
session.getTransaction().begin();
// Print out all required information
System.out.println("Session Is Opened :: "+ session.isOpen());
System.out.println("Session Is Connected :: "+ session.isConnected());
// commit transaction
session.getTransaction().commit();
}
}
答案 0 :(得分:2)
问题是 - 我如何坚持使用此代码?
你不能,你必须修改代码。
您必须像这样保存实体:
/**
* Created by jonathan on 27/12/16.
*/
public class Earth {
public static void main(String[] args){
Animal a = new Animal(1,"lizard", "gekko", "test");
HibernateUtil(a);
}
public static void HibernateUtil(Animal a){
// create configuration instance and pass in the
// hibernate configuration file.
Configuration configuration = new Configuration();
configuration.configure("hibernate.cfg.xml");
// version 4.x and up, service registry is being used.
// The ServiceRegistry scopes the Service.
// The ServiceRegistry manages the lifecycle of the Service.
// The ServiceRegistry handles injecting dependencies into the Service
// (actually both a pull and a push/injection approach are supported).
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
// create a Session factory instance: session factory creates sessions
// at the request of clients.
// conceptually, this is a single data store that is thread safe.
// should be wrapped in a singleton (HibernateUtil being a common convention)
// the internal state is immutable - once it is created the state is set.
SessionFactory factory = configuration.buildSessionFactory(serviceRegistry);
// get the current session.
Session session = factory.getCurrentSession();
// begin transaction
session.getTransaction().begin();
// Print out all required information
System.out.println("Session Is Opened :: "+ session.isOpen());
System.out.println("Session Is Connected :: "+ session.isConnected());
session.save(a);
// commit transaction
session.getTransaction().commit();
}
}
这是一个糟糕的例子,因为它是very procedual而不是面向对象,只包含对代码的最小更改。您还需要解决许多其他问题,例如您将无法访问构建的sessionfactory的问题,请阅读OOD。
IoC和Demeter的法律迫使我们使用TransactionManager。 Spring-TX是一种通常的最先进的实现方式。