hibernate基本配置优化

前面已经说过hibernate的基本配置了，现在对之前的基本配置进行代码优化；

写一个读取配置工具

 package tool;

 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 import org.hibernate.cfg.Configuration;
 //configuration的工具
 public final class HibernateUtil {
     private static SessionFactory sessionFactory;
     private HibernateUtil(){

     }
     public static SessionFactory getSessionFactory() {
         return sessionFactory;
     }
     static{
         Configuration cfg = new Configuration().configure();
         sessionFactory=cfg.buildSessionFactory();
     }
     public static Session getSession()
     {
         return sessionFactory.openSession();
     }

 }

在测试类中写一个添加数据和获取数据方法

 // 获取数据
     static Admin getAdmin(int id) {
         Session session = null;
         try {
             session = HibernateUtil.getSession();
             Admin admin = session.get(Admin.class, id);
             return admin;
         } finally {
             if (session != null)
                 session.close();
         }
     }

     // 添加数据
     static void addAdmin(Admin admin) {
         Session session = null;
         Transaction tx = null;
         try {
             session = HibernateUtil.getSession();
             tx = session.beginTransaction();
             session.save(admin);
             tx.commit();
         } finally {
             if (session != null)
                 session.close();
         }
     }

剩下的直接调用就行了

 public static void main(String[] args) {
         // 创建进行持久化对象
 //        Admin admin = new Admin();
 //        admin.setUserId(6);
 //        admin.setUserName("李四");
 //        admin.setUserPwd("456");
 //        addAdmin(admin);
         Admin admin1 = getAdmin(1);
         System.out.println("name["+admin1.getUserName()+"],password["+admin1.getUserPwd()+"]");
     }