hibernate sesion中的方法

只是CRUD操作，也可以参考这位学长的，
http://blog.youkuaiyun.com/a1610770854/article/details/51939473
更多sesion方法
http://blog.youkuaiyun.com/shrek_xu/article/details/740991

所需jar包
hibernate-release-5.0.7.Final 下的lib下的jpa和required

还有

User.java

package cn.hiber;

public class User {
        private int id;
        private String username;
        private String password;
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getUsername() {
            return username;
        }
        public void setUsername(String username) {
            this.username = username;
        }
        public String getPassword() {
            return password;
        }
        public void setPassword(String password) {
            this.password = password;
        }
                @Override
        public String toString() {
            return "User [id=" + id + ", username=" + username + ", password="
                    + password + "]";
        }
}

User.hbm.xml

<?xml version='1.0' encoding='utf-8'?>  
<!DOCTYPE hibernate-mapping PUBLIC  
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"  
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">  
<hibernate-mapping>  

    <class name="cn.hiber.User" table="t_user" schema="hibernate">  
        <id name="id" column="id">  
            <!--指定主键生成方式,native:使用数据库本地方式-->  
            <generator class="native" />  
        </id>  
        <property name="username" column="username"/>  
        <property name="password" column="password"/>  

    </class>  
</hibernate-mapping>  

hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>  
<!DOCTYPE hibernate-configuration PUBLIC  
        "-//Hibernate/Hibernate Configuration DTD//EN"  
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">  
<hibernate-configuration>  
    <session-factory>  
        <!--数据库信息-->  
        <property name="connection.username">root</property>  
        <property name="connection.password">root</property>  
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>  
        <property name="connection.url">jdbc:mysql:///test</property>  

        <!--hibernate基本信息-->  
        <!--hibernate使用的数据库方言-->  
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>  
        <!--执行操作时,是否在控制台打印SQL-->  
        <property name="show_sql">true</property>  
        <!--是否对SQL格式化-->  
        <property name="format_sql">true</property>  
        <!--指定声称数据库表的策略-->  
        <property name="hbm2ddl.auto">update</property>  
        <!--指定关联的.hbm.xml文件-->  
        <mapping resource="cn/hiber/User.hbm.xml"/>  
    </session-factory>  
</hibernate-configuration>  

UserUntil.java

package cn.hiber;

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

public class UserUntil {
    static Configuration cfg=null;
    static SessionFactory sessionFactory=null;
    static{
        cfg=new Configuration().configure();
        sessionFactory=cfg.buildSessionFactory();

    }
    public static SessionFactory getSessionFactory() {
        // TODO Auto-generated method stub
        return sessionFactory;
    }
}

UserTest.java

package cn.hiber;

import org.hibernate.Session;  
import org.hibernate.SessionFactory;  
import org.hibernate.Transaction;  
import org.hibernate.cfg.Configuration;  
import org.junit.Test;


public class UserTest {  

    @Test
    public void addtest(){
/*
        //加载hibernate配置文件，封装对象
        Configuration cfg= new Configuration().configure();  
        //读取配置文件，创建sessionFactory，把表创建
        SessionFactory sessionFactory = cfg.buildSessionFactory(); */ 
        SessionFactory sessionFactory=UserUntil.getSessionFactory();
        //类似连接 
        Session session = sessionFactory.openSession();  
        //开启事务  
        Transaction tx= session.beginTransaction();  

        //执行保存操作  
        User user=new User();
        user.setUsername("sssss");
        user.setPassword("123456");
        session.save(user);

        //提交事务  
        tx.commit();   
        //关闭Session  
        session.close();  
        //关闭SessionFactory  
        sessionFactory.close();  
    }  
    @Test
    public void gettest(){
/*
        //加载hibernate配置文件，封装对象
        Configuration cfg= new Configuration().configure();  
        //读取配置文件，创建sessionFactory，把表创建
        SessionFactory sessionFactory = cfg.buildSessionFactory(); */ 
        SessionFactory sessionFactory=UserUntil.getSessionFactory();
        //类似连接 
        Session session = sessionFactory.openSession();  
        //开启事务  
        Transaction tx= session.beginTransaction();  

        //执行根据ID查询操作 ,先生成toString
        User user=session.get(User.class, 2);
        System.out.println(user);

        //提交事务  
        tx.commit();   
        //关闭Session  
        session.close();  
        //关闭SessionFactory  
        sessionFactory.close();  
    }  
    @Test
    public void updatetest(){
/*
        //加载hibernate配置文件，封装对象
        Configuration cfg= new Configuration().configure();  
        //读取配置文件，创建sessionFactory，把表创建
        SessionFactory sessionFactory = cfg.buildSessionFactory(); */ 
        SessionFactory sessionFactory=UserUntil.getSessionFactory();
        //类似连接 
        Session session = sessionFactory.openSession();  
        //开启事务  
        Transaction tx= session.beginTransaction();  

        //执行根据ID查询操作 ,再update。
        //删除的话就是sesion.delete(user);
        User user=session.get(User.class, 2);
        user.setUsername("ccccc");
        session.update(user);

        //提交事务  
        tx.commit();   
        //关闭Session  
        session.close();  
        //关闭SessionFactory  
        sessionFactory.close();  
    }  

}