HibernateUtil.java

Posted 2020-08-25

package com.hkwy.util;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;

public class HibernateUtil{
    public static final SessionFactory sessionFactory;
    static{
        Configuration config = new AnnotationConfiguration().configure();  //读取并解析配置文件
        sessionFactory = config.buildSessionFactory();   //创建SessionFactory 
    }
    /**
     * @return
     * 打开Session   获取连接
     */
    public static Session getSession(){
        return sessionFactory.openSession();   //打开session
    }
    /**
     * @param session
     * 关闭session   关闭连接
     */
    public static void closeSession(Session session){
        if(session !=null){    //关闭session
            session.close();
        }
    }
    public static void main(String[] args) {
        System.out.println(HibernateUtil.getSession());
        //若连接成功   打印出：SessionImpl(PersistenceContext[entityKeys=[],collectionKeys=[]];ActionQueue[insertions=[] updates=[] deletions=[] collectionCreations=[] collectionRemovals=[] collectionUpdates=[]])
    }
}