在ssh項目中，需要連接兩個不同ip下的數據庫，所以必須要給hibernate配置兩個或多個數據源
因爲我只有一臺電腦，所以我配置的是sqlserver+MySQL兩個數據源
首先hibernate配置是直接從myeclipse中添加的 右鍵----myeclipse-----add hibernate
之後會生成 hibernate.cfg.xml文件，這個文件是配置數據源的，因爲咱們需要鏈接兩個數據源，所以將文件拷貝一份重命名mysql.cfg.xml
以下是部分代碼
sqlserver數據源配置
<property name="connection.url">
jdbc:sqlserver://localhost:1433;databaseName=chdb
</property>
<property name="connection.username">sa</property>
<property name="connection.password">123</property>
<property name="dialect">
org.hibernate.dialect.SQLServerDialect
</property>
<property name="myeclipse.connection.profile">testpro</property>
<property name="connection.driver_class">
com.microsoft.sqlserver.jdbc.SQLServerDriver
</property>
mysql數據源配置
<property name="connection.url">jdbc:mysql://localhost:3306/lenovo</property>
<property name="connection.username">root</property>
<property name="connection.password">123</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="myeclipse.connection.profile">mysql</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
修改HibernateSessionFactory
代碼如下：
package com.changh.common;
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 String MYSQL_CONFIG_FILE_LOCATION = "/mysql.cfg.xml";
private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
private static final ThreadLocal<Session> mythreadLocal = new ThreadLocal<Session>();//因爲每一個threadLocal有一個id，所以如果同時使用兩個數據源的話必須是兩個threadlocal
private static Configuration configuration = new Configuration();
private static org.hibernate.SessionFactory sessionFactory;
private static Configuration Myconfiguration = new Configuration();
private static org.hibernate.SessionFactory MysessionFactory;
private static String configFile = CONFIG_FILE_LOCATION;
private static String mysqlconfigFile = MYSQL_CONFIG_FILE_LOCATION;
static {
try {
configuration.configure(configFile);
sessionFactory = configuration.buildSessionFactory();
Myconfiguration.configure(mysqlconfigFile);
MysessionFactory=Myconfiguration.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;
}
public static Session getMySession() throws HibernateException {
Session session = (Session) mythreadLocal.get();
if (session == null || !session.isOpen()) {
if (MysessionFactory == null) {
rebuildSessionFactory();
}
session = (MysessionFactory != null) ? MysessionFactory.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;
}
}
basehibernatedao文件代碼如下：
import com.common.HibernateSessionFactory;
import org.hibernate.Session;
/**
* Data access object (DAO) for domain model
* @author MyEclipse Persistence Tools
*/
public class BaseHibernateDAO implements IBaseHibernateDAO {
public Session getSession() {
return HibernateSessionFactory.getSession();
}
public Session getMySession(){
return HibernateSessionFactory.getMySession();
}
自定義的事物編寫代碼如下：
public void mergeUser(UserInfo userInfo) {
Session session = getSession();
Session mySession=getMySession();
Transaction tx = session.beginTransaction();
Transaction tx2 = mySession.beginTransaction();
com.changh.mysql.vo.Userinfo myuser = new com.changh.mysql.vo.Userinfo();
try {
String queryString;
myuser.setUsername(userInfo.getUserName());
myuser.setPassword(userInfo.getPassword());
mySession.merge(myuser);
if (userInfo.getId()==null) {
session.save(userInfo);
}else {
session.update(userInfo);
}
UserInfoRole userInfoRole = new UserInfoRole();
userInfoRole.setRoleId(Integer.parseInt(userInfo.getRoleId()));
userInfoRole.setUserInfoId(userInfo.getId());
session.merge(userInfoRole);
}else {
}
tx2.commit();
tx.commit();
} catch (RuntimeException re) {
tx2.rollback();
tx.rollback();
log.error(re);// 記錄錯誤日誌
throw re;
} finally {
session.close();
}
}