Hibernate3 参考手册例子学习

技术2022-05-11 79

首先需要的包： antlr-2.7.6.jar asm.jar asm-attrs.jar cglib-2.1.3.jar commons-collentions-2.1.1.jar commons-logging-1.0.4.jar dom4j-1.6.1.jar ehcache-1.2.3.jar jta.jar log4j-1.2.11.jar hibernate.jar hsqldb.jar mysql-connector-java-5.0.3-bin.jar 1。要持久化处理的类Event

package events;

import java.util.*;

public class Event { private Long id; private String title; private Date date;

public Long getId() { return id; }

//注意是private，原因是我们一般不去处理这个id的 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; } }

2。/Event类的数据库匹配文件Event.hbm.xml

<?xml version="1.0" encoding="GBK"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

</hibernate-mapping>

//注意这个配置文件和Event类最好放在同一个目录下，即配置文件也在这个events包下面

3。log4j.properties文件

### direct log messages to stdout ###log4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.Target=System.outlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file hibernate.log ####log4j.appender.file=org.apache.log4j.FileAppender#log4j.appender.file.File=hibernate.log#log4j.appender.file.layout=org.apache.log4j.PatternLayout#log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=warn, stdout

log4j.logger.org.hibernate=info#log4j.logger.org.hibernate=debug

### log HQL query parser activity#log4j.logger.org.hibernate.hql.ast.AST=debug

### log just the SQL#log4j.logger.org.hibernate.SQL=debug

### log JDBC bind parameters ###log4j.logger.org.hibernate.type=info#log4j.logger.org.hibernate.type=debug

### log schema export/update ###log4j.logger.org.hibernate.tool.hbm2ddl=debug

### log HQL parse trees#log4j.logger.org.hibernate.hql=debug

### log cache activity ####log4j.logger.org.hibernate.cache=debug

### log transaction activity#log4j.logger.org.hibernate.transaction=debug

### log JDBC resource acquisition#log4j.logger.org.hibernate.jdbc=debug

### enable the following line if you want to track down connection ###### leakages when using DriverManagerConnectionProvider ####log4j.logger.org.hibernate.connection.DriverManagerConnectionProvider=trace

4。.Hibernate.hbm.xml数据库配置文件注意它和包在同一层次上

a。针对mysql的(这个是我家的，原文是hsqldb数据库) <?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="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost/yay</property> <property name="connection.username">root</property> <property name="connection.password">qwe123</property>

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

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

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

<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

<property name="show_sql">true</property>

</hibernate-configuration> 用mysql时候需要在yay数据库目录下建立表event，sql语句如下： create table event ( id bigint(5) auto_increment primary key, date timestamp not null, title varchar(50) );

b。这个是以用hsqldb时候的配置文件 <?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="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>

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

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

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

<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

<property name="show_sql">true</property>

</session-factory>

</hibernate-configuration> 这里需要提醒的是：你只需要启动数据库系统，不需要你自己去建立表格或者库。启动数据库时候需要建立一个目录，比如data，然后在这个目录下键入这个dos命令：D:/hibernate3/data>java -classpath ../lib/hsqldb.jar org.hsqldb.Server 这个时候如果你到data目录下去看，会看到自动生成3个文件，可见数据是保存在调用启动数据库命令的目录里面的。

5。/获取SessionFactory对象的辅助类：package util;

import org.hibernate.*;import org.hibernate.cfg.*;

public class HibernateUtil{

private static final SessionFactory sessionFactory;

static { try { // Create the SessionFactory from hibernate.cfg.xml 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; }

}

6。用来做测试，包含main方法的类package events;import org.hibernate.*;import org.hibernate.criterion.Expression;

import java.util.*;

import util.HibernateUtil;

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(); System.out.println("**************************"); for (int i = 0; i < events.size(); i++) { Event theEvent = (Event) events.get(i); System.out.println("Event: " + theEvent.getTitle() + " Time: " + theEvent.getDate()); } System.out.println("**************************"); } HibernateUtil.getSessionFactory().close(); }

private Long 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();

return theEvent.getId(); }

private List listEvents() {

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

List result = session.createQuery("from events.Event").list(); //List result = session.createQuery("from Event").list();也是可以的

session.getTransaction().commit();

return result; }

}

7。少不了ant工具的配合

</project>注意这里的${basedir}指的就是build.xml文件所在的目录。

8。//运行：注意，可以从命令行里面传递参数赋到ant中，比如这里的${action}" 参数一 run -Daction=store 参数二 run -Daction=list

给大家看看我的目录结构吧：》hibernate目录 data目录在这个目录下，调用命令启动hsqldb的 lib目录在这个目录下，把需要的包全部放进来 SQL目录在这个目录下，我生成mysql需要的sql语句 enentTable.sql 文件 src目录 events包 Event.hbm.xml 文件 Event.java 文件 EventManager.java 文件 util包 HibernateUtil.java 文件 hibernate.cfg.xml 文件(注意针对mysql和hsqldb的各不相同) log4j.properties 文件 build.xml 文件

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Hibernate3 参考手册 例子学习

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Hibernate3 参考手册例子学习