hibernate 入门案例

1，创建工程，导入jar

ojdbc14.jar 数据库驱动包，我用的是oracle数据库，根据实际的数据库选择驱动包

创建java类，并利用bibernate插件完成orm映射，创建hbm.xml  cfg.xml

调整下表名称和主键生成方式

创建测试代码

 package com.lxl.it.vo;

 public class Student {
 private String name;
 private int age;
 private int 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;
 }
 public int getId() {
     return id;
 }
 public void setId(int id) {
     this.id = id;
 }
 @Override
 public String toString() {
     return "Student [name=" + name + ", age=" + age + ", id=" + id + "]";
 }

 }

java类

 <?xml version="1.0"?>
 <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
                                    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 <!-- Generated 2016-9-5 14:36:05 by Hibernate Tools 3.4.0.CR1 -->
 <hibernate-mapping>
  <class name="com.lxl.it.vo.Student" table="STUDENT">
   <id name="id" type="int">
    <column name="ID"/>
     <generator class="sequence">
                 <param name="sequence">SEQ_LXL_TEST</param>
     </generator>
   </id>
   <property generated="never" lazy="false" name="name" type="java.lang.String">
    <column name="NAME"/>
   </property>
   <property generated="never" lazy="false" name="age" type="int">
    <column name="AGE"/>
   </property>
  </class>
 </hibernate-mapping>

类的映射文件

 <?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">oracle.jdbc.driver.OracleDriver</property>
         <property name="hibernate.connection.password">bspdev</property>
         <property name="hibernate.connection.url">jdbc:oracle:thin:@10.202.6.37:1521:bspdev1</property>
         <property name="hibernate.connection.username">bsp</property>
         <property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
     <!-- 执行操作时是否在控制台打印 SQL -->
   <property name="show_sql">true</property>
   <!-- 是否对 SQL 进行格式化 -->
   <property name="format_sql">true</property>
       <!-- 生成数据表的策略 -->
         <property name="hbm2ddl.auto">update</property>
   <!-- 指定自动生成数据表的策略 -->
   <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
   <!-- 指定关联的 .hbm.xml 文件 -->
   <mapping resource="com/atguigu/hibernate/helloworld/News.hbm.xml"/>
      <mapping resource="com/lxl/it/vo/Student.hbm.xml"/>
  </session-factory>
 </hibernate-configuration>

hibernate主配置文件

 package com.lxl.it.vo;

 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 import org.hibernate.Transaction;
 import org.hibernate.cfg.Configuration;
 import org.hibernate.service.ServiceRegistry;
 import org.hibernate.service.ServiceRegistryBuilder;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;

 public class StudentTest {
     private SessionFactory sessionFactory;
     private Session session;
     private Transaction transaction;

     @Before
     public void init() {
         Configuration configuration = new Configuration().configure();
         ServiceRegistry serivceRegistry = new ServiceRegistryBuilder()
                 .applySettings(configuration.getProperties())
                 .buildServiceRegistry();
         sessionFactory=configuration.buildSessionFactory(serivceRegistry);
         session =sessionFactory.openSession();
         transaction=session.beginTransaction();
     }
     @After
     public void destory(){
         transaction.commit();
         session.close();
         sessionFactory.close();
     }
     @Test
     public void testSessionCache(){
         Student s=(Student)session.get(Student.class, 1);
         System.out.println(s);
         Student s2=(Student)session.get(Student.class, 1);
         System.out.println(s);
     }

     @Test
     public void test() {
         Configuration configuration = new Configuration().configure();
         ServiceRegistry serviceRegistry = new ServiceRegistryBuilder()
                 .applySettings(configuration.getProperties())
                 .buildServiceRegistry();
         SessionFactory sessionFactory = configuration
                 .buildSessionFactory(serviceRegistry);
         Session session = sessionFactory.openSession();
         Transaction transcation = session.beginTransaction();
         Student s = new Student();
         s.setAge(10);
         s.setName("lxl");
         session.save(s);
         transcation.commit();
         session.close();
         sessionFactory.close();
     }
 }

测试类