2. 实例代码
新建一个java工程,假设取名为HibernateHelloWorld。在src下新那一个package,可取名为com.sun.hibernate.model
2.1 类代码
新建一个简单的类,放在com.sun.hibernate.model包下。内容如下:
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package com.sun.hibernate.model;public class Student { private int id; private String name; private int age; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; }} |
2.2 配置hibernate配置文件
hibernate\projec\etc中的hiberante.cfg.xml可以作为hibernate的配置文档,或者可使用hibernate\documentation\manual\en-US\html_single\index.html作为模板。在src文件夹下新建一个文件,并命名为hibernate.cfg.xml。(不可命名为其他文件名)最基础的配置文件可参考如下:
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<?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> <!-- Database connection settings --> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost/hibernate</property> <property name="connection.username">root</property> <property name="connection.password">root</property> <!-- JDBC connection pool (use the built-in) --> <!-- <property name="connection.pool_size">1</property> --> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <!-- Enable Hibernate‘s automatic session context management --> <!--<property name="current_session_context_class">thread</property>--> <!-- Drop and re-create the database schema on startup --> <!-- <property name="hbm2ddl.auto">create</property> --> <!-- Disable the second-level cache --> <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> <mapping resource="com/sun/hibernate/model/Student.hbm.xml"/> </session-factory></hibernate-configuration> |
mapping resource处的值可根据包名和类名做修改。若类名为Student,则此处的类配置文件必为:Student.hbm.xml。
2.3 类mapping文件
新建一个文件,命名为Student.hbm.xml,放在com.sun.hibernate.model包下。内容如下:
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<?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 package="com.sun.hibernate.model"> <class name="Student"> <id name="id"></id> <property name="name"></property> <property name="age"></property> </class></hibernate-mapping> |
注意文件开始处的配置,此处与hibernate.cfg.xml不一样。如果配置的与hiberante.cfg.xml一样,运行时会提示错误:“文档根元素 "hibernate-mapping" 必须匹配 DOCTYPE 根 "hibernate-configuration" ”
2.4 StudentTest测试类
新增Student.java的junit测试类StudentTest.java,放在com.sun.hibernate.model包下代码如下:
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package com.sun.hibernate.model;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;public class StudentTest { public static void main(String[] args){ Student s = new Student(); s.setId(1); s.setName("s1"); s.setAge(1); Configuration cfg = new Configuration(); SessionFactory sf = cfg.configure().buildSessionFactory(); Session session = sf.openSession(); session.beginTransaction(); session.save(s); session.getTransaction().commit(); session.close(); sf.close(); }} |
2.5. 运行结果
运行StudentTest.java这个类,虽然提示输入成功。去数据库查询后,可发现数据已存储到student数据表中。虽然myeclipse会提示buildSessionFactory()这个函数被deprecated,但实际上程序还是可以运行成功的。
原文:http://www.cnblogs.com/luowen-1/p/6131203.html