hibernate配置笔记

一个配置的例子：
1.先在数据库中建立一个表cat
create table cat(
cat_id varchar(20) PRIMARY KEY not null,
name varchar(20) not null,
sex char(1))
2.建立Hibernate.cfg.XML并生成hibernaetFactory.class管理他
hibernate.cfg.xml
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">

<!-- DO NOT EDIT: This is a generated file that is synchronized -->
<!-- by MyEclipse Hibernate tool integration. -->
<hibernate-configuration>

<session-factory>
<!-- properties -->
<property name="connection.username">root</property>
<property name="connection.url">JDBC:MySQL://localhost:3306/test</property>
<property name="dialect">net.sf.hibernate.dialect.MySQLDialect</property>
<property name="connection.password"></property>
<property name="connection.driver_class">org.gjt.mm.mysql.Driver</property>

<!-- mapping files -->
<mapping resource="com/mdcl/vo/Cat.hbm.xml"/>

</session-factory>

</hibernate-configuration>
HibernaetFactory.Java
package com.mdcl.hibernate;

import net.sf.hibernate.HibernateException;
import net.sf.hibernate.Session;
import net.sf.hibernate.cfg.Configuration;

/**
* Configures and provides Access to Hibernate sessions, tied to the
* current thread of execution. Follows the Thread Local Session
* pattern, see {@link http://hibernate.org/42.html}.
*/
public class HibernateFactory {

/**
* Location of hibernate.cfg.xml file.
* NOTICE: Location should be on the classpath as Hibernate uses
* #resourceAsStream style lookup for its configuration file. That
* is place the config file in a Java package - the default location
* is the default Java package.<br><br>
* Examples: <br>
* <code>CONFIG_FILE_LOCATION = "/hibernate.conf.xml".
* CONFIG_FILE_LOCATION = "/com/foo/bar/myhiberstuff.conf.xml".</code>
*/
private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";

/** Holds a single instance of Session */
private static final ThreadLocal threadLocal = new ThreadLocal();

/** The single instance of hibernate configuration */
private static final Configuration cfg = new Configuration();

/** The single instance of hibernate SessionFactory */
private static net.sf.hibernate.SessionFactory sessionFactory;

public static Session currentSession() throws HibernateException {
Session session = (Session) threadLocal.get();
if (session != null && !session.isOpen()) session = null;
if (session == null) {
if (sessionFactory == null) {
try {
cfg.configure(CONFIG_FILE_LOCATION);
sessionFactory = cfg.buildSessionFactory();
} catch (Exception e) {
System.err
.println("%%%% Error Creating HibernateSessionFactory %%%%");
e.printStackTrace();
}
}
session = sessionFactory.openSession();
threadLocal.set(session);
}
return session;
}
public static void closeSession() throws HibernateException {
Session session = (Session) threadLocal.get();
threadLocal.set(null);

if (session != null) {
session.close();
}
}
private HibernateFactory() {
}

}
3.建立cat表的po(持久对象)，生成cat.cfg.xml,cat.java,AbstractCat.java的过程和上面生成hibernate.cfg.xml和hibernateFactory.java的过程可以由myeclipse协助完成。
cat.cfg.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd" >

<!-- DO NOT EDIT: This is a generated file that is synchronized -->
<!-- by MyEclipse Hibernate tool integration. -->
<!-- Created Sat Feb 19 12:00:50 CST 2005 -->
<hibernate-mapping package="com.mdcl.vo">

<class name="Cat" table="cat">
<id name="catId" column="cat_id" type="java.lang.String">
<generator class="uuid.hex"/>
</id>

<property name="name" column="name" type="java.lang.String" not-null="true" />
<property name="sex" column="sex" type="java.lang.String" />
</class>

</hibernate-mapping>
cat.java

/*
* Created Thu Feb 17 16:11:44 CST 2005 by MyEclipse Hibernate Tool.

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