hibernate初探

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建立使用hibernate的过程:

1.  导入包文件(本例导入hibernate5.1.0final版本),只需导入request文件夹下的包以及mysql驱动包,需要测试的话需要导入Juint.jar,具体如图:2.  配置cfg文件:创建hibernate.cfg.xml文件,可以在互联网中搜索一个样本,具体配置如下:<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE hibernate-configuration PUBLIC        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration>    <session-factory>        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>        <property name="hibernate.connection.password">123456</property>        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/wycm_hibernate</property>        <property name="hibernate.connection.username">root</property>        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>        <property name="hbm2ddl.auto">update</property>        <property name="show_sql">true</property>    </session-factory></hibernate-configuration>其中hbm2dll.auto这个参数指的是需要自动创建新表.其他参数的含义根据语义理解即可3.  创建单例模式的SessionFactory.由于工厂只需要一个单例来维护session的生成,所以把工厂创建的过程写到hibernateUtil这个类中,创建单例模式.

创建pojo类,并对此类进行声明,并设置getter,setter方法.

package org.wycm.dao;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name=”t_news”)
public class News {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private int id;
private String title;

private String content;public int getId() {    return id;}public void setId(int id) {    this.id = id;}public String getTitle() {    return title;}public void setTitle(String title) {    this.title = title;}public String getContent() {    return content;}public void setContent(String content) {    this.content = content;}

}

5.  建立session,并进行测试

package org.wycm.test;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.junit.Test;
import org.wycm.dao.News;
import org.wycm.util.HibernateUtil;

public class test01 {
@Test
public void test() {

    Session session=HibernateUtil.openSession();//开启session    Transaction tx=session.beginTransaction();//开启事务    News news=new News();    news.setTitle("aaa");    news.setContent("bbb");    session.save(news);    tx.commit();//进行提交    HibernateUtil.closeSession(session);}

}

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