hibernate ——helloWorld程序（XML配置）

1、项目结构

2、hibernate实现了Java类 和 数据库表的映射（Map）

　　先看一下Student的Java类和对应的数据库表

 package com.pt.hibernate;

 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;
     }
 }

Student.java

　　创建Student表的SQL语句

 CREATE TABLE `student` (
   `Id` int(20) NOT NULL,
   `Name` varchar(20) DEFAULT NULL,
   `Age` int(3) DEFAULT NULL,
   PRIMARY KEY (`Id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1

Creat table

3、通过student.xml配置文件，将Java类和数据库表关联起来

 <?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="com.pt.hibernate">
     <class name="Student" table="student">
         <id name="id" column="id" ></id>
         <property name="name" column="name" ></property>
         <property name="age" column="age" ></property>
     </class>
 </hibernate-mapping>

Student.xml

4、通过hibernate.cfg.xml配置文件，初始化hibernate所需要的信息

 <?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">org.hsqldb.jdbcDriver</property>
                     <property name="connection.url">jdbc:hsqldb:hsql://localhost/TestDB</property> -->

         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
         <property name="connection.url">jdbc:mysql://localhost/test?useUnicode=true&amp;characterEncoding=UTF-8</property>
         <property name="connection.username">root</property>
         <property name="connection.password"></property>

         <!-- SQL dialect -->
         <property name="dialect">
             org.hibernate.dialect.MySQLInnoDBDialect
         </property>
         <property name="show_sql">true</property>
          <mapping resource="com/pt/hibernate/Student.xml"/>
     </session-factory>

 </hibernate-configuration>

hibernate.cfg.xml

5、测试

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

 import com.pt.hibernate.Student;

 public class StudentTest {
     public static void main(String[] arges){
         Student s= new Student();
         s.setId(20111901);
         s.setName("panteng");
         s.setAge(23);
         Configuration cfg = new Configuration();
         SessionFactory sessionFactory = cfg.configure().buildSessionFactory();
         Session session = sessionFactory.openSession();
         session.beginTransaction();
         session.save(s);
         session.getTransaction().commit();
         session.close();
         sessionFactory.close();

     }
 }

StudentTest