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()+"]");
    }