hibernate基本配置优化

Posted 2020-09-22 我的名称很霸气

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

 1 package tool;
 2 
 3 import org.hibernate.Session;
 4 import org.hibernate.SessionFactory;
 5 import org.hibernate.cfg.Configuration;
 6 //configuration的工具
 7 public final class HibernateUtil {
 8     private static SessionFactory sessionFactory;
 9     private HibernateUtil(){
10         
11     }
12     public static SessionFactory getSessionFactory() {
13         return sessionFactory;
14     }
15     static{
16         Configuration cfg = new Configuration().configure();
17         sessionFactory=cfg.buildSessionFactory();
18     }
19     public static Session getSession()
20     {
21         return sessionFactory.openSession();
22     }
23     
24 }

在测试类中写一个添加数据和获取数据方法

 1 // 获取数据
 2     static Admin getAdmin(int id) {
 3         Session session = null;
 4         try {
 5             session = HibernateUtil.getSession();
 6             Admin admin = session.get(Admin.class, id);
 7             return admin;
 8         } finally {
 9             if (session != null)
10                 session.close();
11         }
12     }
13 
14     // 添加数据
15     static void addAdmin(Admin admin) {
16         Session session = null;
17         Transaction tx = null;
18         try {
19             session = HibernateUtil.getSession();
20             tx = session.beginTransaction();
21             session.save(admin);
22             tx.commit();
23         } finally {
24             if (session != null)
25                 session.close();
26         }
27     }

剩下的直接调用就行了

 1 public static void main(String[] args) {
 2         // 创建进行持久化对象
 3 //        Admin admin = new Admin();
 4 //        admin.setUserId(6);
 5 //        admin.setUserName("李四");
 6 //        admin.setUserPwd("456");
 7 //        addAdmin(admin);
 8         Admin admin1 = getAdmin(1);
 9         System.out.println("name["+admin1.getUserName()+"],password["+admin1.getUserPwd()+"]");
10     }