三、步驟
1.導(dǎo)入包的準(zhǔn)備工作
a.新建java project.建立包example
在它下面編寫類Cat.java
package example;
// Fields
private String catId;
private String name;
private String sex;
private Float weight;
// Constructors
/** default constructor */
public Cat() {
}
/** minimal constructor */
public Cat(String name) {
this.name = name;
}
/** full constructor */
public Cat(String name, String sex, Float weight) {
this.name = name;
this.sex = sex;
this.weight = weight;
}
// Property accessors
public String getCatId() {
return this.catId;
}
public void setCatId(String catId) {
this.catId = catId;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return this.sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Float getWeight() {
return this.weight;
}
public void setWeight(Float weight) {
this.weight = weight;
}
}
同樣在此包下面編寫Cat.hbm.xml
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"<!--
Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping>
<class name="example.Cat" table="cat" catalog="testhibernate">
<id name="catId" type="java.lang.String">
<column name="cat_id" length="32" />
<generator class="uuid.hex"></generator>
</id>
<property name="name" type="java.lang.String">
<column name="name" length="16" not-null="true" />
</property>
<property name="sex" type="java.lang.String">
<column name="sex" length="1" />
</property>
<property name="weight" type="java.lang.Float">
<column name="weight" precision="9" scale="3" />
</property>
</class>
</hibernate-mapping>
b.在工程的src里面加入一個(gè)包，用來存放將要生成的HibernateSessionFactory。包名如（example.util）。
package example.util;
import org.hibernate.Session;
import org.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 HibernateSessionFactory {
* Location of hibernate.cfg.xml file.
* Location should be on the classpath as Hibernate uses
* #resourceAsStream style lookup for its configuration file.
* The default classpath location of the hibernate config file is
* in the default package. Use #setConfigFile() to update
* the location of the configuration file for the current session.
*/
private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
private static Configuration configuration = new Configuration();
private static org.hibernate.SessionFactory sessionFactory;
private static String configFile = CONFIG_FILE_LOCATION;
}
/**
* Returns the ThreadLocal Session instance. Lazy initialize
* the <code>SessionFactory</code> if needed.
*
* @return Session
* @throws HibernateException
*/
public static Session getSession() throws HibernateException {
Session session = (Session) threadLocal.get();
if (sessionFactory == null) {
rebuildSessionFactory();
}
session = (sessionFactory != null) ? sessionFactory.openSession()
: null;
threadLocal.set(session);
}
}
* Rebuild hibernate session factory
*
*/
public static void rebuildSessionFactory() {
try {
configuration.configure(configFile);
sessionFactory = configuration.buildSessionFactory();
} catch (Exception e) {
System.err
.println("%%%% Error Creating SessionFactory %%%%");
e.printStackTrace();
}
}
* Close the single hibernate session instance.
*
* @throws HibernateException
*/
public static void closeSession() throws HibernateException {
Session session = (Session) threadLocal.get();
threadLocal.set(null);
session.close();
}
}
* return session factory
*
*/
public static org.hibernate.SessionFactory getSessionFactory() {
return sessionFactory;
}
* return session factory
*
* session factory will be rebuilded in the next call
*/
public static void setConfigFile(String configFile) {
HibernateSessionFactory.configFile = configFile;
sessionFactory = null;
}
* return hibernate configuration
*
*/
public static Configuration getConfiguration() {
return configuration;
}
對(duì)工程名點(diǎn)鼠標(biāo)右鍵。選擇myeclipse->add
hibernate capabicities。
在彈出的窗口選擇中Hibernate 3.0 Core Libraries和Hibernate 3.0 Advanced Support Libraries
下面選中Copy checked Library Jars to project folder and add to build-path。點(diǎn)擊下一步。
c.默認(rèn)（hibernate cofig file），下一步。
d.選中User JDBC driver
connect url: jdbc:mysql://localhost:3306/test
Driver class: org.gjt.mm.mysql.Driver
username: root
password: ******
Dialect: mysql
e.在第一行包選擇里面，選擇在前面第二大步建的包如（example）。點(diǎn)擊完成。
f.彈出的畫面中 選擇properties的add按鈕。在Property中加入show_sql，Value中加入true。點(diǎn)確定
保存設(shè)置。在mappings中點(diǎn)add加入前面建立的Cat.hbm.xml。最后生成的hibernate.cfg.xml文件如下 <!-- Generated by MyEclipse Hibernate Tools. --> <session-factory> </session-factory> </hibernate-configuration>
<?xml version=‘1.0‘ encoding=‘UTF-8‘?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"
<hibernate-configuration>
<property name="connection.username">root</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/testhibernate
</property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="connection.password">123456</property>
<property name="connection.driver_class">
org.gjt.mm.mysql.Driver
</property>
<property name="show_sql">true</property>
<mapping resource="example/Cat.hbm.xml" />
package test;
import java.util.List;
import example.*;
import example.util.*;
import org.hibernate.Session;
import org.hibernate.Transaction;
Session session=null;
Transaction tx=null;
public static void main(String[] args) {
TestHibernate th=new TestHibernate();
List cl=th.getAllCats();
if(cl!=null){
Iterator it=cl.iterator();
while(it.hasNext()){
Cat cat=(Cat)it.next();
System.out.println("catID:"+cat.getCatId()+"name:"+cat.getName()+"sex:"+cat.getSex());
}
}
public List getAllCats(){
session=HibernateSessionFactory.getSession();
List catlist=null;
try{
tx=session.beginTransaction();
catlist=session.createQuery("from Cat").list();
return catlist;
}catch(Exception ex){
System.err.println(ex.getMessage());
return null;
}finally{
HibernateSessionFactory.closeSession();
}
}
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