hibernate第一课

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1、在hibernate官网下载相应文件，打开MyEclipse，创建项目，并添加hibernate相应jar包和mysq数据库驱动包。

2、Student.java

package com.wxh.hibernate.model;public class Student {public 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;}}

3.Student.hbm.xml

<hibernate-mapping package="com.wxh.hibernate.model"><class name="Student" ><id name="id"></id><properties name="age"></properties><properties name="name"></properties></class></hibernate-mapping>

4.hibernate.cfg.xml

<?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>        <!-- Database connection settings -->        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>        <property name="connection.url">jdbc:mysql://localhost/db</property>        <property name="connection.username">root</property>        <property name="connection.password">111</property>               <!-- SQL dialect -->        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>               <!-- Disable the second-level cache  -->        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>        <!-- Echo all executed SQL to stdout -->        <property name="show_sql">true</property>             <mapping resource="com/wxh/hibernate/model/Student.hbm.xml"/>    </session-factory></hibernate-configuration>

5.StudentTest.java

import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;import com.wxh.hibernate.model.Student;public class StudentTest {public static void main(String[] args){Student s=new Student();s.setId(2);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();}}

6.在mysql中新建数据库db和相应的表结构。

7.思考：为什么数据库中只能插入id的值，age和name的值没有？

8.解决办法：修改配置文件Student.hbm.xml，把其中的properties改为property，问题解决。

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