Hibernate基本步骤

最新推荐文章于 2025-07-28 23:27:29 发布

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#hibernate #string #user #class #session #import

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本文介绍如何使用Hibernate框架进行数据库操作，包括定义持久化类、配置映射文件及SessionFactory，最后通过示例展示了如何保存数据。

pre-准备

库文件

antlr-2.7.6.jar

cglib-2.1.3.jar

asm.jar

asm-attrs.jar

commons-collections-2.1.1.jar

commons-logging-1.0.4.jar

ehcache-1.2.3.jar

hibernate3.jar

jta.jar

dom4j-1.6.1.jar

log4j-1.2.11.jar

数据库

mysql 或者其它

jdbc---mysql-connector-java.jar

1、定义pojo类（持久化类）

public class User { private String id; private String name; //所有的持久化类都要求有无参数的构造器 //hibernate必须使用java反射机制创建对象 public User(){ } public final String getId() { return id; } public final void setId(String id) { this.id = id; } public final String getName() { return name; } public final void setName(String name) { this.name = name; } }

2、定义映射

<?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="package"> <class name="package.User" table="user"> <id name="id" column="id"> <generator class="native"/> </id> <property name="name"></property> </class> </hibernate-mapping>

3、定义工厂

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property> <property name="hibernate.connection.username">root</property> <property name="connection.pool_size">1</property> <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <property name="current_session_context_class">thread</property> <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> <property name="show_sql">true</property> <property name="hbm2ddl.auto">true</property> <mapping resource="events/Event.hbm.xml"/> </session-factory> </hibernate-configuration>

3、实例化工厂

import org.hibernate.*; import org.hibernate.cfg.*; public class HibernateUtil { private static final SessionFactory sessionFactory; static{ try{ sessionFactory = new Configuration().configure().buildSessionFactory(); }catch (Throwable ex) { System.err.println("Initial SessionFactory creation failed:"+ex); throw new ExceptionInInitializerError(ex); } } public static SessionFactory getSessionFactory() { return sessionFactory; } }

4、实现

import org.hibernate.Session; import package.User; import util.HibernateUtil; public class Test { public static void main(String[] args){ Test t = new Test(); t.createAndStoreEvent("bakeloar"); HibernateUtil.getSessionFactory().close(); } private void createAndStoreEvent(String name){ Session session = HibernateUtil.getSessionFactory().getCurrentSession(); session.beginTransaction(); User user= new User (); user.setNAme(name); session.save(user); session.getTransaction().commit(); } }