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Hibernat试用

原创|其它|编辑:郝浩|2009-04-07 09:20:07.000|阅读 507 次

概述:HIBERNATE是一个数据库层持久框架,今天下载了一个3.3.1版试用了一下

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  HIBERNATE是一个数据库层持久框架,今天下载了一个3.3.1版试用了一下;

  首先创建一个对象类:

import java.util.Date;

public class Event {
private Long id;

private String title;
private Date date;

public Event() {
}

public Long getId() {
return id;
}

private void setId(Long id) {
this.id = id;
}

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;
}
}

  接下来创建相应对象的XML配置文件:

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC

"-//Hibernate/Hibernate Mapping DTD 3.0//EN"

"//hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

<class name="events.Event" table="EVENTS">

<id name="id" column="EVENT_ID">

<generator class="native" />

</id>

<property name="date" type="timestamp" column="EVENT_DATE" />

<property name="title" />

</class>

</hibernate-mapping>

  接下来就是创建Hibernate的配置文件hibernate.cfg.xml:

<?xml version='1.0' encoding='utf-8'?>

<!DOCTYPE hibernate-configuration PUBLIC

"-//Hibernate/Hibernate Configuration DTD 3.0//EN"

"//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</property>

<property name="connection.username">sa</property>

<property name="connection.password"></property>

<!-- JDBC connection pool (use the built-in) -->

<property name="connection.pool_size">1</property>

<!-- SQL dialect -->

<property name="dialect">org.hibernate.dialect.HSQLDialect</property>

<!-- Enable Hibernate's automatic session context management -->

<property name="current_session_context_class">thread</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>

<!--

Drop and re-create the database schema on startup <property

name="hbm2ddl.auto">create</property>

-->

<mapping resource="events/Event.hbm.xml" />

</session-factory>

</hibernate-configuration>

  这里对于数据则采用了纯JAVA实现的HSQLDB。

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

public class HibernateUtil {

private static final SessionFactory sessionFactory;

static {
try {
// Create the SessionFactory from hibernate.cfg.xml
// 此处还可以在configure方法中指定具体的配置文件 configure(File configFile)
sessionFactory = new Configuration().configure().buildSessionFactory();
} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}

  store:开始往数据库中写入数据

  list:读取目前的记录并在控制台打印出来

public class EventManager {

public static void main(String[] args) {
EventManager mgr = new EventManager();

if (args[0].equals("store")) {
mgr.createAndStoreEvent("My Event", new Date());
} else if (args[0].equals("list")) {
List events = mgr.listEvents();
for (int i = 0; i < events.size(); i++) {
Event theEvent = (Event) events.get(i);
System.out.println("Event: " + theEvent.getTitle() + " Time: " + theEvent.getDate());
}
}

HibernateUtil.getSessionFactory().close();
}

private List listEvents() {

Session session = HibernateUtil.getSessionFactory().getCurrentSession();

session.beginTransaction();

List result = session.createQuery("from Event").list();

session.getTransaction().commit();

return result;
}

private void createAndStoreEvent(String title, Date theDate) {

Session session = HibernateUtil.getSessionFactory().getCurrentSession();

session.beginTransaction();

Event theEvent = new Event();
theEvent.setTitle(title);
theEvent.setDate(theDate);

session.save(theEvent);

session.getTransaction().commit();
}

}

  最终的SRC目录结构如下:

  src

  │ hibernate.cfg.xml

  ├─events

  │   Event.hbm.xml

  │   Event.java

  └─util

      EventManager.java

      HibernateUtil.java

  引用的LIB包有:

lib
antlr-2.7.6.jar
commons-collections-3.1.jar
dom4j-1.6.1.jar
hibernate3.jar
hsqldb.jar
javassist-3.4.GA.jar
jta-1.1.jar
slf4j-api-1.5.2.jar
slf4j-simple-1.5.2.jar

  当然还需要启动数据库:

  F:devhsqldbmytest>java -classpath ../lib/hsqldb.jar org.hsqldb.Server

  F:devhsqldbmytest>java -cp ../lib/hsqldb.jar org.hsqldb.util.DatabaseManager

  Hibernate的JAVADOC文档,没找到下载的链接,只有一个在线链接:


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