Hibernate入门配置

一、建表
<<<<<<<<<<<<<表cat>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
CREATE TABLE cat (
cat_id varchar(20) NOT NULL,
NAME varchar(20) NOT NULL,
sex CHAR(1),
weight FLOAT,
PRIMARY KEY (cat_id)
);
二、po层（系统以cat.hbm.xml为准，一个xml可以写多个class）
<<<<<<<<<<<<<cat.hbm.xml>>>>>>>>>>>>>>>>>>>>>>>
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="com.netease.wireless.groupsms.hbnt.po.Cat" table="cat">
<id name="id" type="string" unsaved-value="null" >
<column name="cat_id" sql-type="varchar(20)" not-null="true"/>
<generator class="uuid.hex"/>
</id>
<property name="name">
<column name="NAME" sql-type="varchar(20)" not-null="true"/>
</property>
<property name="sex"/>
<property name="weight"/>
</class>
</hibernate-mapping>
<<<<<<<<<<<<<Cat.java>>>>>>>>>>>>>>>>>>>>>>>>>
package com.netease.wireless.groupsms.hbnt.po;
public class Cat {
private String id;
private String name;
private char sex;
private float weight;
public Cat() {
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public char getSex() {
return sex;
}
public void setSex(char sex) {
this.sex = sex;
}
public float getWeight() {
return weight;
}
public void setWeight(float weight) {
this.weight = weight;
}
public String toString() {
String strCat = new StringBuffer()
.append(this.getId()).append(", ")
.append(this.getName()).append(", ")
.append(this.getSex()).append(", ")
.append(this.getWeight())
.toString();
return strCat;
}
}

三、hibernate.cfg.xml
（切切不要自己去加属性，基本的就两个connection.datasource和dialect）
<property name="connection.username">root</property>
<property name="connection.password">root</property>
<property name="connection.provider_class">net.sf.hibernate.connection.DatasourceConnectionProvider</property>
<property name="jndi.class">org.gjt.mm.mysql.Driver</property>
<<<<<<<<<<<<<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.datasource">java:comp/env/jdbc/test</property>
<property name="show_sql">true</property>
<property name="dialect">net.sf.hibernate.dialect.MySQLDialect</property>

<!-- mapping files -->
<mapping resource="com/netease/wireless/groupsms/hbnt/po/cat.hbm.xml"/>

</session-factory>
</hibernate-configuration>
四、测试servlet
//Session生成/关闭
<<<<<<<<<<<<<HibernateUtil.java>>>>>>>>>>>>>>>>>>>>>>>
package com.netease.wireless.groupsms.hbnt.util;
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 HibernateUtil {
/**
* 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";//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;
/**
* Returns the ThreadLocal Session instance. Lazy initialize
* the <code>SessionFactory</code> if needed.
*
* @return Session
* @throws HibernateException
*/
public static Session currentSession() throws HibernateException {
Session session = (Session) threadLocal.get();
  if (session == null) {
if (sessionFactory == null) {
try {
cfg.configure(CONFIG_FILE_LOCATION);
//cfg.configure();
sessionFactory = cfg.buildSessionFactory();
}
catch (Exception e) {
System.err.println("%%%% Error Creating SessionFactory %%%%");
System.err.println("|||||||||||||" + e.getMessage());
e.printStackTrace();
}
}
session = sessionFactory.openSession();
threadLocal.set(session);
}
return session;
}
/**
* Close the single hibernate session instance.
*
* @throws HibernateException
*/
public static void closeSession() throws HibernateException {
Session session = (Session) threadLocal.get();
threadLocal.set(null);
if (session != null) {
session.close();
}
}
/**
* Default constructor.
*/
private HibernateUtil() {
}
}

<<<<<<<<<<<<<测试HbntTestSvlt.java>>>>>>>>>>>>>>>>>>>>>>>
/*
*
* @(#)CorpSMS.corpsms V1.0 2005-1-15
* Copyright 2003 NetEase, Inc. All rights reserved.
*
* coder: sweater
* email: wtshi@corp.netease.com
*
* graphic designer:
* email:
*
* fuction：向电话薄中添加组和电话号码
*
*/
package com.netease.wireless.groupsms.vo;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.Query;
import net.sf.hibernate.Session;
import net.sf.hibernate.Transaction;
import com.netease.wireless.groupsms.hbnt.po.Cat;
import com.netease.wireless.groupsms.hbnt.util.HibernateUtil;
/**
*
* @author sweater
*/
public class HbntTestSvlt extends HttpServlet {
/**
* Constructor of the object.
*/
public HbntTestSvlt() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Hello Hibernate</title>");
out.println("</head>");
out.println("<body>");
out.println("Hello Hibernate!<br>");
try {
Session session = HibernateUtil.currentSession();
Transaction tx = session.beginTransaction();
Query query = session.createQuery("select cat from Cat as cat where cat.sex = :sex");
query.setCharacter("sex", 'F');
for (Iterator it = query.iterate(); it.hasNext();) {
Cat cat = (Cat) it.next();
out.println("Cat: " + cat.toString() + "<br>");
}
tx.commit();
HibernateUtil.closeSession();
} catch (HibernateException e) {
System.out.println(e.getMessage());
//System.out.println(e.printStackTrace());
}
out.println("</body>");
out.println("</html>");
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC /"-//W3C//DTD HTML 4.01 Transitional//EN/">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the POST method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* Returns information about the servlet, such as
* author, version, and copyright.
*
* @return String information about this servlet
*/
public String getServletInfo() {
return "This is my default servlet created by Eclipse";
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occure
*/
public void init() throws ServletException {
// Put your code here
}
}

<<<<<<<<<<<<<该servlet使用时的web.xml>>>>>>>>>>>>>>>>>>>>>>>
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <servlet>
<description>hbnttest</description>
<display-name>hbnttest</display-name>
<servlet-name>HbntTestSvlt</servlet-name>
<servlet-class>com.netease.wireless.groupsms.vo.HbntTestSvlt</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HbntTestSvlt</servlet-name>
<url-pattern>/servlet/HbntTestSvlt</url-pattern>
</servlet-mapping>
</web-app>
</SPAN< p>