Hibernate快速入门

参考：http://docs.jboss.org/hibernate/orm/5.1/quickstart/html_single/

下载：http://sourceforge.net/projects/hibernate/files/hibernate-orm/5.1.0.Final/hibernate-release-5.1.0.Final.zip/download

1. bootstrap a hibernate SessionFactory

编写hibernate配置文件hibernate.cfg.xml，放在classpath下。

<?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> <!-- 数据库连接设置 --> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql:///test</property> <property name="connection.username">duan</property> <property name="connection.password">123456</property> <!-- 数据库连接池设置（内置的，并没有什么用） --> <property name="connection.pool_size">1</property> <!-- SQL方言 --> <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property> <!-- 禁用二级缓存 --> <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property> <!-- 在标准输出流显示执行的SQL --> <property name="show_sql">true</property> <!-- 启动的时候重建数据库 --> <property name="hbm2ddl.auto">create</property> <!-- 使用了注解的映射实体类 --> <mapping class="org.hibernate.tutorial.annotations.Event"/> </session-factory> </hibernate-configuration>

2. use annotations to provide mapping information

编写使用了注解的映射实体类Event.java。如何使用注解参考：http://www.cnblogs.com/hippiebaby/p/5465725.html

@Entity @Table( name = "EVENTS" ) public class Event { private Long id; private String title; private Date date; public Event() { // this form used by Hibernate } public Event(String title, Date date) { // for application use, to create new events this.title = title; this.date = date; } @Id @GeneratedValue public Long getId() { return id; } private void setId(Long id) { this.id = id; } @Temporal(TemporalType.TIMESTAMP) @Column(name = "EVENT_DATE") public Date getDate() { return date; } public void setDate(Date date) { this.date = date; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } }

3. use the hibernate native APIs

用JUnit测试。

public class AnnotationsIllustrationTest extends TestCase { private SessionFactory sessionFactory; @Override protected void setUp() throws Exception { // 在应用中SessionFactory只在开始的时候配置一次 final StandardServiceRegistry registry = new StandardServiceRegistryBuilder() .configure() // 默认从hibernate.cfg.xml中获取配置 .build(); try { sessionFactory = new MetadataSources( registry ).buildMetadata().buildSessionFactory(); } catch (Exception e) { // The registry would be destroyed by the SessionFactory, // but we had trouble building the SessionFactory. // so destroy it manually. StandardServiceRegistryBuilder.destroy( registry ); } } @Override protected void tearDown() throws Exception { if ( sessionFactory != null ) { sessionFactory.close(); } } @SuppressWarnings({ "unchecked" }) public void testBasicUsage() { // 从SessionFactory中获得Session Session session = sessionFactory.openSession(); // 开始事务 session.beginTransaction(); // 插入数据 session.save( new Event( "Our very first event!", new Date() ) ); session.save( new Event( "A follow up event", new Date() ) ); // 提交事务 session.getTransaction().commit(); // 关闭Session session.close(); session = sessionFactory.openSession(); session.beginTransaction(); // 查询所有的Event List result = session.createQuery( "from Event" ).list(); // 遍历结果 for ( Event event : (List<Event>) result ) { System.out.println( "Event (" + event.getDate() + ") : " + event.getTitle() ); } session.getTransaction().commit(); session.close(); } }

转载于:https://www.cnblogs.com/hippiebaby/p/5510163.html

相关资源：数据结构—成绩单生成器