hibernate 的简单创建

本文介绍了一个使用Hibernate框架连接DB2数据库的具体实现案例。包括配置文件hibernate.cfg.xml的详细设置,实体类UsersPO及其映射文件UsersPO.hbm.xml的设计,DAO层操作UsersDAO的增删改查功能实现,以及JUnit测试用例验证。

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hibernate.cfg.xml

<?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">

<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration>

<session-factory>
<property name="hbm2ddl.auto">update</property>
<property name="dialect">org.hibernate.dialect.DB2Dialect</property>
<property name="connection.url">jdbc:db2://192.168.25.230:50000/JSAMPLE</property>
<property name="connection.username">zyl</property>
<property name="connection.password">123</property>
<property name="connection.driver_class">com.ibm.db2.jcc.DB2Driver</property>
<property name="myeclipse.connection.profile">zyl</property>
<mapping resource="com/zyl/po/UsersPO.hbm.xml" />

</session-factory>

</hibernate-configuration>
-------------------------------------------------------------------------------------------
UsersPO.java

package com.zyl.po;

import java.io.Serializable;
import java.util.Date;


public class UsersPO implements Serializable{
/**
*
*/
private Long usersID;
private String username;
private String userpassword;
private Date regDate;
public Long getUsersID() {
return usersID;
}
public void setUsersID(Long usersID) {
this.usersID = usersID;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getUserpassword() {
return userpassword;
}
public void setUserpassword(String userpassword) {
this.userpassword = userpassword;
}
public Date getRegDate() {
return regDate;
}
public void setRegDate(Date regDate) {
this.regDate = regDate;
}
public UsersPO(String username, String userpassword, Date regDate) {
super();
this.username = username;
this.userpassword = userpassword;
this.regDate = regDate;
}



}
-------------------------------------------------------------------------------------------
UsersPO.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.zyl.po" schema="zyl">
<class name="UsersPO" table="zylUsers">
<id column="usersID" name="usersID" type="long">
<generator class="sequence">
<param name="sequence">users_seq</param>
</generator>
</id>
<property name="username" type="string"/>
<property name="userpassword" type="string"/>
<property name="regDate" type="date"/>
</class>
<database-object>
<create><![CDATA[create sequence users_seq start with 1]]></create>
<drop></drop>
<dialect-scope name="org.hibernate.dialect.DB2Dialect"/>
</database-object>
</hibernate-mapping>
-------------------------------------------------------------------------------------------
UsersDAO.java

package com.zyl.dao;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

import com.zyl.factory.HibernateSessionFactory;
import com.zyl.po.UsersPO;

public class UsersDAO {

public void saveUser(UsersPO usersPO){
Session session = HibernateSessionFactory.getSession();
Transaction trans = session.beginTransaction();

session.save(usersPO);

trans.commit();
session.close();
}
public UsersPO findUsersById(Long id){

Session session = HibernateSessionFactory.getSession();
Transaction trans = session.beginTransaction();

UsersPO usersPO =(UsersPO)session.load(com.zyl.po.UsersPO.class, id);
trans.commit();
session.close();
return usersPO;
}
public List<UsersPO> findAllUsersPO(){

Session session = HibernateSessionFactory.getSession();
Transaction trans = session.beginTransaction();


Query query = session.createQuery("select u from UsersPO u order by u.usersID desc");
List<UsersPO> usersList = query.list();



trans.commit();

session.close();

return usersList;
}
public void updateUsersPO(UsersPO usersPO){

Session session = HibernateSessionFactory.getSession();
Transaction trans = session.beginTransaction();


session.update(usersPO);


trans.commit();

session.close();


}

public void deleteUsersPO(UsersPO usersPO){

Session session = HibernateSessionFactory.getSession();
Transaction trans = session.beginTransaction();


session.delete(usersPO);


trans.commit();

session.close();


}


}
-------------------------------------------------------------------------------------------
package com.ascent.dao.test;

import java.util.List;

import junit.framework.Assert;

import org.junit.Test;

import com.ascent.dao.UsersDAO;
import com.ascent.po.UsersPO;

public class UsersDAOTestCase {

///@Test
public void testSaveUsers() {

UsersPO usersPO = new UsersPO("zyl","123",new java.util.Date());
UsersDAO usersDAO = new UsersDAO();

usersDAO.saveUsers(usersPO);

Assert.assertNotNull("插入失败",usersPO.getUsersID());
System.out.println(usersPO.getUsersID());


}

//@Test
public void testFindUsersPOById(){

UsersDAO usersDAO = new UsersDAO();

UsersPO usersPO = usersDAO.findUsersById(2L);

Assert.assertNotNull("查询失败",usersPO);
System.out.println(usersPO.toString());


}

//@Test
public void testFindAllUsersPO(){

UsersDAO usersDAO = new UsersDAO();

List<UsersPO> usersList = usersDAO.findAllUsersPO();


Assert.assertNotNull(usersList);

for (UsersPO usersPO : usersList) {
System.out.println(usersPO);
}



}

///@Test
public void testUpdateUsersPO(){

UsersDAO usersDAO = new UsersDAO();

UsersPO usersPO = usersDAO.findUsersById(2L);

Assert.assertNotNull("查询失败",usersPO);


usersPO.setUsersName("xyf");

usersDAO.updateUsersPO(usersPO);


}

@Test
public void testDeleteUsersPO(){

UsersDAO usersDAO = new UsersDAO();

UsersPO usersPO = usersDAO.findUsersById(1L);

Assert.assertNotNull("查询失败",usersPO);


// usersPO.setUsersName("ddd");

usersDAO.deleteUsersPO(usersPO);


}




}-------------------------------------------------------------------------------------------
HibernateSessionFactory.java


package com.zyl.hiber.SessionFactory;

import org.hibernate.HibernateException;
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;

static {
try {
configuration.configure(configFile);
sessionFactory = configuration.buildSessionFactory();
} catch (Exception e) {
System.err
.println("%%%% Error Creating SessionFactory %%%%");
e.printStackTrace();
}
}
private HibernateSessionFactory() {
}

/**
* 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 (session == null || !session.isOpen()) {
if (sessionFactory == null) {
rebuildSessionFactory();
}
session = (sessionFactory != null) ? sessionFactory.openSession()
: null;
threadLocal.set(session);
}

return 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);

if (session != 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;
}

}-------------------------------------------------------------------------------------------
ToDDL.java


package com.zyl.util;


import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;


public class ToDDL {
public static void main (String[] args) {
Configuration configure= new Configuration();
configure.configure("hibernate.cfg.xml");
SchemaExport sc=new SchemaExport(configure);
sc.create(true, true);

}
}


-------------------------------------------------------------------------------------------
log4j.properties


log4j.rootLogger=DEBUG,A1
log4j.appender.A1 = org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.TTCCLayout


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

junit测试
增删改查
hibernate连DB2

Zyl.java和Zyl.hbm.xml是由表ZYL是逆向工程生成的 DB Browser - 表(zyl) 右键 - Java src forder :/hibernateTest/src ,Java package:com.zyl.po - hibernate Reverse Engneering-选Create POJO和java data Object-Hibernate types 和 identity

表zylusers 是正向生成的表里有userid,username,userpassword,regDate
<mapping resource="com/zyl/po/UsersPO.hbm.xml" />
HibernateSessionFactory.java
用myeclipse 自动生成hibernate
点项目名称--右键--MyEclipse--Add Hibernate Capabilities


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