Hibernate 动态添加数据库（数据库信息不固定）
  上篇文章利用spring来连接多个数据库并进行切换数据源，此时，数据库的信息都已经固定，不能更改；在某些项目中，我们要在程序中，动态的添加数据库连接，数据库的信息不确定，需要程序给出。下面是用Hibernate动态连接数据库的实例（项目环境：SSH（利用Hibernate注解））前提是：两个数据库中的数据结构一致：
public class HibernateConfiguration extends AnnotationConfiguration {
public HibernateConfiguration() {
super();
}

public void reset() {
super.reset();
}

public HibernateConfiguration(String dialect, String driverClass,
String ipAddress, String port, String dataBaseName,
String username, String password) {
String connection_url = "";
if (dialect.indexOf("MySQL") > -1) {
connection_url = "jdbc:mysql://" + ipAddress + "/" + dataBaseName;
} else if (dialect.indexOf("SQLServer") > -1) {
connection_url = "jdbc:sqlserver://" + ipAddress + ":" + port
+ ";DataBaseName=" + dataBaseName;
} else if (dialect.indexOf("Oracle") > -1) {
connection_url = "jdbc:oracle:thin:@" + ipAddress + ":" + port
+ ":" + dataBaseName;
} else {
throw new HibernateException("The dialect was not allowed.==fd=="
+ dialect);
}

super.setProperty("hibernate.dialect", dialect);
super.setProperty("hibernate.connection.url", connection_url);
super.setProperty("hibernate.connection.driver_class", driverClass);
super.setProperty("hibernate.connection.username", username);
super.setProperty("hibernate.connection.password", password);
}

public HibernateConfiguration(String dialect, String driverClass,
String ipAddress, String port, String dataBaseName,
String username, String password, String schema, String catalog) {
String connection_url = "";
if (dialect.indexOf("MySQL") > -1) {
connection_url = "jdbc:mysql://" + ipAddress + "/" + dataBaseName;
} else if (dialect.indexOf("SQLServer") > -1) {
connection_url = "jdbc:sqlserver://" + ipAddress + ":" + port
+ ";DataBaseName=" + dataBaseName;
} else if (dialect.indexOf("Oracle") > -1) {
connection_url = "jdbc:oracle:thin:@" + ipAddress + ":" + port
+ ":" + dataBaseName;
} else {
throw new HibernateException("The dialect was not allowed.==fd=="
+ dialect);
}
super.setProperty("hibernate.dialect", dialect);
super.setProperty("hibernate.connection.url", connection_url);
super.setProperty("hibernate.connection.driver_class", driverClass);
super.setProperty("hibernate.connection.username", username);
super.setProperty("hibernate.connection.password", password);
super.setProperty("hibernate.default_schema", schema);
super.setProperty("hibernate.default_catalog", catalog);
super.setProperty("hibernate.show_sql", "true");
}
}

public class TempSessionFactory {
public static HibernateConfiguration configuration = new HibernateConfiguration();
public static SessionFactory sessionFactory;
public static void reflashSessionFactory(
HibernateConfiguration tempConfiguration) {
try {
if (tempConfiguration.getProperty("hibernate.dialect").equals(
configuration.getProperty("hibernate.dialect"))
&& tempConfiguration
.getProperty("hibernate.connection.url")
.equalsIgnoreCase(
configuration
.getProperty("hibernate.connection.url"))
&& tempConfiguration
.getProperty("hibernate.connection.username")
.equals(configuration
.getProperty("hibernate.connection.username"))
&& tempConfiguration
.getProperty("hibernate.connection.password")
.equals(configuration
.getProperty("hibernate.connection.password"))) {

System.out
.println("%%%% TempSessionFact