在Tomcat 5.5.4中通过Hibernate 2.1.8访问MySQL数据库

mysql> select * from users;

+----+-------+------------+----------------+
| id | name | password | createTime |
+----+-------+------------+----------------+
| 1 | bitan | bbbbbbbbb | 20050202035511 |
| 2 | helen | hhhhhhhhh | 20050202035526 |
| 3 | susan | ssssssssss | 20050202035541 |
+----+-------+------------+----------------+
3 rows in set (0.00 sec)

K:\tomcat\conf\server.xml

……

<Context path="/test26" docBase="K:\test26" workDir="K:\test26\j2src" reloadable="true" debug="0">

<Resource name="jdbc/mydata" auth="Container" type="javax.sql.DataSource"
maxActive="100" maxIdle="30" maxWait="10000"
username="root" password="" driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost/mydata"/>

</Context>

</Host>

</Engine>

</Service>

</Server>

K:\test26\WEB-INF\web.xml

<?xml version="1.0" encoding="utf-8"?>
<web-app 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"
version="2.4">

<!--与server.xml中的相关内容相互印证-->
<resource-ref>
<description>aaaaaaaaaaaaaaaa</description>
<res-ref-name>jdbc/mydata</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>


</web-app>

K:\test26\WEB-INF\classes\hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC '-//Hibernate/Hibernate Configuration DTD//EN' 'http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd'>

<hibernate-configuration>
<session-factory>

<!--JNDI名字在web.xml和server.xml中设置-->
<property name="connection.datasource">java:comp/env/jdbc/mydata</property>
<property name="show_sql">false</property>
<property name="dialect">net.sf.hibernate.dialect.MySQLDialect</property>

<mapping resource="Users.hbm.xml"/>
</session-factory>
</hibernate-configuration>

K:\test26\WEB-INF\classes\Users.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC '-//Hibernate/Hibernate Mapping DTD//EN' 'http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd'>

<hibernate-mapping>
<class name="beans.Users" table="users">
<id name="id" column="id" unsaved-value="0">
<generator class="increment"/>
</id>
<property name="name" type="string">
<column name="name" sql-type="varchar(20)" not-null="true"/>
</property>
<property name="password">
<column name="password" sql-type="varchar(40)" not-null="true"/>
</property>
<property name="createTime">
<column name="createTime" sql-type="timestamp" not-null="false"/>
</property>
</class>
</hibernate-mapping>

K:\test26\src\Users.java

//类似javaBean

package beans;

public class Users {
private int id;
private String name;
private String password;
private String createTime;
public void setId(int id) {
this.id = id;
}
public int getId() {
return this.id;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return this.name;
}
public void setPassword(String password) {
this.password = password;
}
public String getPassword() {
return this.password;
}
public void setCreateTime(String createTime) {
this.createTime = createTime;
}
public String getCreateTime() {
return this.createTime;
}
}

K:\test26\src\HibernateUtil.java

//设置Hibernate

package utils;

import net.sf.hibernate.*;
import net.sf.hibernate.cfg.*;

public class HibernateUtil {
private static final ThreadLocal sessions = new ThreadLocal();
private static final SessionFactory factory;
static {
try {
factory = new Configuration().configure().buildSessionFactory();
} catch (HibernateException he) {
he.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
public static Session currentSession() throws HibernateException {
Session s = (Session) sessions.get();
if (s == null) {
s = factory.openSession();
sessions.set(s);
}
return s;
}
public static void closeSession() throws HibernateException {
Session s = (Session) sessions.get();
sessions.set(null);
if (s != null) {
s.close();
}
}
}

K:\test26\hiber.jsp

<%@ page contentType="text/html;charset=GBK"%>
<%@ page import="net.sf.hibernate.*,
net.sf.hibernate.cfg.*,
beans.Users,
utils.HibernateUtil,
java.util.Iterator"
%>
<%
try {
net.sf.hibernate.Session h_session = utils.HibernateUtil.currentSession();

//插入一行记录
Transaction tx = h_session.beginTransaction();
Users users = new Users();
users.setName("Jodan");
users.setPassword("jjjjjjjjjjj");
h_session.save(users);
tx.commit();
HibernateUtil.closeSession();

//查询所有记录
h_session = HibernateUtil.currentSession();
Transaction tx2 = h_session.beginTransaction();
Query query = h_session.createQuery("selectU from beans.Users as U"); //Hibernate特有的SQL语法
for (Iterator it = query.iterate(); it.hasNext();) {
Users localUsers = (Users)it.next();
int id = localUsers.getId();
String name = localUsers.getName();
String password = localUsers.getPassword();
String createTime = localUsers.getCreateTime();
out.println("id=" + id + " name=" + name + " password=" + password + " createTime=" + createTime + "<br>");

}
tx2.commit();
} catch (HibernateException he) {
System.out.println("**********************" + he.getMessage());
he.printStackTrace();
}

%>

结果：

http://localhost:2000/test26/hiber.jsp

id=1 name=bitan password=bbbbbbbbb createTime=20050202035511
id=2 name=helen password=hhhhhhhhh createTime=20050202035526
id=3 name=susan password=ssssssssss createTime=20050202035541
id=4 name=Jodan password=jjjjjjjjjjj createTime=20050202045004

mysql> select * from users
-> ;
+----+-------+-------------+----------------+
| id | name | password | createTime |
+----+-------+-------------+----------------+
| 1 | bitan | bbbbbbbbb | 20050202035511 |
| 2 | helen | hhhhhhhhh | 20050202035526 |
| 3 | susan | ssssssssss | 20050202035541 |
| 4 | Jodan | jjjjjjjjjjj | 20050202045004 |
+----+-------+-------------+----------------+
4 rows in set (0.06 sec)