Hibernate first experience Cat quick start

Hibernate's CAT example feels unktown, it is difficult to run the first example with it, take a point of discount, I finally see a result, if you are a newbie, you can refer to it, less detours .

1. Download Tomcat and Hibernate

Tomcat 5.0.27http: //apache.linuxForum.Net/dist/jakarta/tomcat-5/v5.0.27/bin/jakarta-tomcat-5.0.27.ziptomcat 5.0.28Http: //apache.linuxForum.net/dist/ JAKARTA / TOMCAT-5 / V5.0.28 / bin / jakarta-tomcat-5.0.28.zipHibernate2.1.6http: //prdownloads.sourceForge.Net/Hibernate/? sort_by = Date & Sort = DESC

2. Installation

Take Tomcat MySQL Hibernate as an example

Tomcat installation, and mysql installation and DBCP formulation See http://blog.9cbs.net/ahxu/archive/2004/09/01/91611.aspx, here is not mentioned, here it is assumed that tomcat mysql has been configured And test, here% webapp% represents root of a web application you have configured, focusing on how Hibernate installation,

1) Unzip the downloaded compressed package, copy the Hibernate2.jar to% WebApp% / WEB-INF / LIB

2) will decompress the LIB directory

CGLIB-FULL-2.0.2.jarcommons-Collections-2.1.1.jarcommons-logging-1.0.4.jardom4j-1.4.jarehcache-0.9.jarjta.jarlog4j-1.2.8.jarodmg-3.0.jar

Documents are also copied to% WebApp% / Web-INF / LIB. For details, see README.TXT under the decompressed LIB directory. 3) will decompress the ETC directory

Log4j.properties

Documents are copied to% webApp% / web-inf / class.

3. Write related files

1) Follow the reference documents, configure hibernate, save the following code as hibernate.cfg.xml placed under the% WebApp% / Web-INF / CLASSES

java: comp / env / jdbc / mysql false Net.sf.hibernate.diaalect.mysqldiaalect Note: Here is different from the Hibernate document, here specifying the data source is mysql database JDBC / MySQL, dialect DiaLect is Net.sf.hibernate.Dialect.MysqldiaAlact.

2) Save the following code as Cat.java, and generate corresponding Cat.class, put% WebApp% / Web-INF / CLASSES, where you use what method to generate Cat.class, but final Cat.Class should be% WebApp% / Web-INF / CLASSES / NET / SF / Hibernate / Examples / QuickStart directory

package net.sf.hibernate.examples.quickstart; public class Cat {private String id; private String name; private char sex; private float weight; public Cat () {} public String getId () {return id;} private 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;}}

3) Save the following code as an O / R mapping file Cat.hbm.xml, put% WebApp% / Web-INF / CLASSES

Public "- // hibernate / hibernate mapping dtd // en"

"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

Generated by hibernate with the uuid pattern. ->

4) Construction form in the database, the structure is as follows

Column | Type | Modifier

-------- ---------------------- -----------

CAT_ID | Character (32) | NOT NULL

Name | Character Varying (16) | NOT NULL

SEX | Character (1) |

Weight | Real |

Indexes: CAT_PKEY PRIMARY Key Btree (Cat_ID)

5) Save the following code as Hibernateutil.java, and generate the corresponding hibernateutil.class, put% WebApp% / Web-INF / CLASSES, also pay attention to Package

Package net.sf.hibernate.examples.quickstart;

Import org.apache.commons.logging.log; import org.apache.commons.logging.logfactory;

Import net.sf.hibernate. *;

import net.sf.hibernate.cfg *;. public class HibernateUtil {private static Log log = LogFactory.getLog (HibernateUtil.class); private static final SessionFactory sessionFactory; static {try {// Create the SessionFactorysessionFactory = new Configuration (). . configure () buildSessionFactory ();} catch (Throwable ex) {log.error ( "Initial SessionFactory creation failed.", ex); throw new ExceptionInInitializerError (ex);}} public static final ThreadLocal session = new ThreadLocal (); Public static session currentations () throws hibernateException {session s = (session) session.get (); // Open a new session, if this thread has none yetif (s == null) {s = sessionFactory.openSession (); session .SET (s);} return s;} shRows HibernateException {session s = (session) session.get (); session.set (null); if (s! = null) S.Close );}} Note: Here is also different from the Hibernate document. There are 2 packages that are missing when the original document is completed.

6) Save the following code as Test.jsp, put% WebApp% / with HTTP test

<% @ page language = "java" PageEncoding = "GB2312"%> <% @ page import = "net.sf.hibernate.Transaction"%> <% @ page import = "net.sf.hibernate.Session"%> <% @ page import = "Net.sf.hibernate.cfg. *"%> <% @ page import = "net.sf.hibernate.query"%> <% @ page import = "net.sf.hibernate.examples .quickstart.hibernateutil "%> <% @ page import =" net.sf.hibernate.examples.quickstart.cat "%> <% @ Page Import =" java.util. * "%>