自由飞翔

假若iframe所在的页面here.html有个JS函数为：wode()，它位于页面的<script></script>这个节

然后iframe的src，即里面的页面为：other.html，那么我们在other.html里面就可以如下调用here.html里面的wode这个函数：window.parent.wode();

mysql -h主机地址 -u用户名 －p用户密码

mysqladmin -u用户名 -p旧密码 password 新密码

从数据库导出数据库文件：

1.将数据库mydb导出到e:\MySQL\mydb.sql文件中：

打开开始->运行->输入cmd 进入命令行模式

c:\>MySQLdump -h localhost -u root -p mydb >e:\MySQL\mydb.sql 

然后输入密码，等待一会导出就成功了，可以到目标文件中检查是否成功。

2.将数据库mydb中的mytable导出到e:\MySQL\mytable.sql文件中：

c:\>MySQLdump -h localhost -u root -p mydb mytable>e:\MySQL\mytable.sql 

3.将数据库mydb的结构导出到e:\MySQL\mydb_stru.sql文件中：

c:\>MySQLdump -h localhost -u root -p mydb --add-drop-table >e:\MySQL\mydb_stru.sql 

-h localhost可以省略，其一般在虚拟主机上用

四.从外部文件MySQL导入数据到数据库中：

从e:\MySQL\mydb2.sql中将文件中的SQL语句导入数据库中：

1.从命令行进入MySQL，然后用命令CREATE DATABASE mydb2;创建数据库mydb2。

2.退出MySQL 可以输入命令exit;或者quit;

3.在CMD中输入下列命令：

c:\>MySQL -h localhost -u root -p mydb2 < e:\MySQL\mydb2.sql 

然后输入密码，就OK了。

五.下面谈一下关于导入文件大小限制问题的解决：

默认情况下：MySQL导入文件大小有限制的，最大为2M，所以当文件很大时候，直接无法导入，下面就这个问题的解决列举如下：

1.在php.ini中修改相关参数：

影响MySQL导入文件大小的参数有三个：

memory_limit=128M,upload_max_filesize=2M,post_max_size=8M 

修改upload_ ......

参考文章：

适用范围：适合SSH架构访问多个数据库，数据库的类型和表结构不必相同，且没有跨库事务的情况（跨库事务最好用分布式事务处理）。

<!-- Hibernate SessionFactorys -->
<bean id="aSessionFactory"
   class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
   <property name="dataSource">
    <ref local="aDataSource" />
   </property>
   <property name="mappingResources">
    <list>
     <value>
      .hbm.xml文件
     </value>
    </list>
   </property>
   <property name="hibernateProperties">
    <props>
     <prop key="hibernate.dialect">
      ${ahibernate.dialect}
     </prop>
     <prop key="hibernate.show_sql">true</prop>
     <prop key="format_sql">true</prop>
    </props>
   </property>
</bean>

<bean id="bSessionFactory"
   class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
   <property name="dataSource">
    <ref local="bDataSource" />
   </property>
   <property name="mappingResources">
    <list>
     <value>
      .hbm.xml文件
     </value>
    </list>
   </property>
   <property name="hibernateProperties">
    <props>
     <prop key="hibernate.dialect">
      ${bhibernate.dialect}
     </prop>
     <prop key="hibernate.show_sql">true</prop>
     <prop key="format_sql">true</prop>
    </props>
   </property>
</bean>

<bean id="cSessionFactory"
   class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
   <property name="dataSource">
    <ref local="cDataSource" />
   </property>
   <property name="mappingResources">
    <list>
     <value>
       .hbm.xml文件
     </value>
    </list>
   </property>
   <property name="hibernateProperties">
    <props>
     <prop key="hibernate.dialect">
      ${chibernate.dialect}
     </prop>
     <prop key="hibernate.show_sql">true</prop>
     <prop key="format_sql">true</prop>
    </props>
   </property>
</bean>

<bean id="sessionFactory" class="com.cintel.dcp.datasource.MultiSessionFactory">
   <property name="sessionFactory"><ref local="aSessionFactory"/></property>
</bean>
注意：最后一个com.cintel.dcp.datasource.MultiSessionFactory要自己实现，它实现了SessionFactory接口和ApplicationContext接口，如下：
package com.cintel.dcp.datasource;

import java.io.Serializable;
import java.sql.Connection;
import java.util.Map;
import java.util.Set;

import javax.naming.NamingException;
import javax.naming.Reference;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.HibernateException;
import org.hibernate.Interceptor;
import org.hibernate.SessionFactory;
import org.hibernate.StatelessSession;
import org.hibernate.classic.Session;
import org.hibernate.engine.FilterDefinition;
import org.hibernate.metadata.ClassMetadata;
import org.hibernate.metadata.CollectionMetadata;
import org.hibernate.stat.Statistics;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

public class MultiSessionFactory implements SessionFactory, ApplicationContextAware {
private static final long serialVersionUID = 2064557324203496378L;
private static final Log log = LogFactory.getLog(MultiSessionFactory.class);
private ApplicationContext applicationContext = null;
private SessionFactory sessionFactory = null;

public ApplicationContext getApplicationContext() {
   return applicationContext;
}

public void setApplicationContext(ApplicationContext applicationContext) {
   this.applicationContext = applicationContext;
}

public SessionFactory getSessionFactory(String sessionFactoryName) {
   log.debug("sessionFactoryName:"+sessionFactoryName);
   try{
    if(sessionFactoryName==null||sessionFactoryName.equals("")){
     return sessionFactory;
    }
    return (SessionFactory)this.getApplicationContext().getBean(sessionFactoryName);
   }catch(NoSuchBeanDefinitionException ex){
    throw new RuntimeException("There is not the sessionFactory <name:"+sessionFactoryName+"> in the applicationContext!");
   }
}

public SessionFactory getSessionFactory() {
   String sessionFactoryName = CustomerContextHolder.getCustomerType();
   return getSessionFactory(sessionFactoryName);
}

public void setSessionFactory(SessionFactory sessionFactory) {
   this.sessionFactory = sessionFactory;
}


/* (non-Javadoc)
* @see org.hibernate.SessionFactory#close()
*/
public void close() throws HibernateException {
   getSessionFactory().close();
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#evict(java.lang.Class)
*/
public void evict(Class persistentClass) throws HibernateException {
   getSessionFactory().evict(persistentClass);
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#evict(java.lang.Class, java.io.Serializable)
*/
public void evict(Class persistentClass, Serializable id) throws HibernateException {
   getSessionFactory().evict(persistentClass, id);
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#evictCollection(java.lang.String)
*/
public void evictCollection(String roleName) throws HibernateException {
   getSessionFactory().evictCollection(roleName);
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#evictCollection(java.lang.String, java.io.Serializable)
*/
public void evictCollection(String roleName, Serializable id) throws HibernateException {
   getSessionFactory().evictCollection(roleName, id);
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#evictEntity(java.lang.String)
*/
public void evictEntity(String entityName) throws HibernateException {
   getSessionFactory().evictEntity(entityName);
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#evictEntity(java.lang.String, java.io.Serializable)
*/
public void evictEntity(String entityName, Serializable id) throws HibernateException {
   getSessionFactory().evictEntity(entityName, id);
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#evictQueries()
*/
public void evictQueries() throws HibernateException {
   getSessionFactory().evictQueries();
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#evictQueries(java.lang.String)
*/
public void evictQueries(String cacheRegion) throws HibernateException {
   getSessionFactory().evictQueries(cacheRegion);
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#getAllClassMetadata()
*/
public Map getAllClassMetadata() throws HibernateException {
   return getSessionFactory().getAllClassMetadata();
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#getAllCollectionMetadata()
*/
public Map getAllCollectionMetadata() throws HibernateException {
   return getSessionFactory().getAllCollectionMetadata();
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#getClassMetadata(java.lang.Class)
*/
public ClassMetadata getClassMetadata(Class persistentClass) throws HibernateException {
   return getSessionFactory().getClassMetadata(persistentClass);
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#getClassMetadata(java.lang.String)
*/
public ClassMetadata getClassMetadata(String entityName) throws HibernateException {
   return getSessionFactory().getClassMetadata(entityName);
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#getCollectionMetadata(java.lang.String)
*/
public CollectionMetadata getCollectionMetadata(String roleName) throws HibernateException {
   return getSessionFactory().getCollectionMetadata(roleName);
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#getCurrentSession()
*/
public Session getCurrentSession() throws HibernateException {
   return getSessionFactory().getCurrentSession();
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#getDefinedFilterNames()
*/
public Set getDefinedFilterNames() {
   return getSessionFactory().getDefinedFilterNames();
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#getFilterDefinition(java.lang.String)
*/
public FilterDefinition getFilterDefinition(String filterName) throws HibernateException {
   return getSessionFactory().getFilterDefinition(filterName);
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#getStatistics()
*/
public Statistics getStatistics() {
   return getSessionFactory().getStatistics();
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#isClosed()
*/
public boolean isClosed() {
   return getSessionFactory().isClosed();
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#openSession()
*/
public Session openSession() throws HibernateException {
   return getSessionFactory().openSession();
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#openSession(java.sql.Connection)
*/
public Session openSession(Connection connection) {
   return getSessionFactory().openSession(connection);
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#openSession(org.hibernate.Interceptor)
*/
public Session openSession(Interceptor interceptor) throws HibernateException {
   return getSessionFactory().openSession(interceptor);
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#openSession(java.sql.Connection, org.hibernate.Interceptor)
*/
public Session openSession(Connection connection, Interceptor interceptor) {
   return getSessionFactory().openSession(connection, interceptor);
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#openStatelessSession()
*/
public StatelessSession openStatelessSession() {
   return getSessionFactory().openStatelessSession();
}
/* (non-Javadoc)
* @see org.hibernate.SessionFactory#openStatelessSession(java.sql.Connection)
*/
public StatelessSession openStatelessSession(Connection connection) {
   return getSessionFactory().openStatelessSession(connection);
}
/* (non-Javadoc)
* @see javax.naming.Referenceable#getReference()
*/
public Reference getReference() throws NamingException {
   return getSessionFactory().getReference();
}
}

然后我用一个常量类来标识sessionFactory
public class DynamicDataSourceType {
public static final String A= "aSessionFactory";
public static final String B= "bSessionFactory";
public static final String C= "cSessionFactory";
}

最后一个关键类：用来存放当前正在使用的sessionFactory
public class CustomerContextHolder {

private static final ThreadLocal contextHolder = new ThreadLocal();

public static void setCustomerType(String customerType) {
   Assert.notNull(customerType, "customerType cannot be null");
   contextHolder.set(customerType);
}

public static String getCustomerType() {
   return (String) contextHolder.get();
}

public static void clearCustomerType() {
   contextHolder.remove();
}
}

可以在action、service、dao中进行数据库切换，切换方式：
CustomerContextHolder.setCustomerType(DynamicDataSourceType.A);

以上思路来自javaEye论坛的一个高手，在此标识感谢

文章来源：

起因：在当前我手上的一个项目中需要多个数据源,并且来自于不同类型的数据库... 因为很多历史原因.这个项目的住数据源是MySQL,整个系统的CURD都是操作的这个数据库.

package lhp.example.context;
public enum DBType {
      dataSource1, dataSource2;
}

package lhp.example.context;

public class ContextHolder {
    private static final ThreadLocal<Object> holder = new ThreadLocal<Object>();

    public static void setDbType(DBType dbType) {
        holder.set(dbType);
    }

    public static DBType getDbType() {
        return (DBType) holder.get();
    }

    public static void clearDbType() {
        holder.remove();
    }
}

package lhp.example.context;

import java.util.logging.Logger;

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

public class DynamicDataSource extends AbstractRoutingDataSource {
    public static final Logger logger = Logger.getLogger(DynamicDataSource.class.toString());

    @Override
    protected Object determineCurrentLookupKey() {
        DBType key = ContextHolder.getDbType();//获得当前数据源标识符
        //logger.info("当前数据源 :" + key);
        return key;
    }

}

<!-- 数据源1 ： mysql -->
    <bean id="dataSource1" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver" />
        <property name="jdbcUrl" value="jdbc:mysql://127.0.0.1:3306/dec" />
        <property name="user" value="root" />
        <property name="password" value="" />
    </bean>
    <!-- 数据源2 ： mysql  -->
    <bean id="dataSource2" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver" />
        <property name="jdbcUrl" value="jdbc:mysql://127.0.0.1:3306/lms" />
        <property name="user" value="root" />
        <property name="password" value="" />
    </bean>

    <!-- 数据源3 ：  access -->
    <bean id="dataSource3" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="sun.jdbc.odbc.JdbcOdbcDriver" />
        <property name="jdbcUrl" value="jdbc:odbc:accessTest" />
        <property name="user" value="administrator" />
        <property name="password" value="XLZX0309" />
    </bean>

    <!-- mysql 动态数据源设置-->
    <bean id="mysqlDynamicDataSource" class="lhp.example.context.DynamicDataSource">
        <property name="targetDataSources">
            <!-- 标识符类型 -->
            <map key-type="lhp.example.context.DBType">
                <entry key="dataSource1" value-ref="dataSource1" />
                <entry key="dataSource2" value-ref="dataSource2" />
            </map>
        </property>
        <property name="defaultTargetDataSource" ref="dataSource1" />
    </bean>
    

<!-- mysql sessionFactory -->
    <bean id="mysqlSessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource" ref="mysqlDynamicDataSource" />
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop><!--create validate -->
                <prop key="hibernate.query.substitutions">true 1, false 0</prop>
            </props>
        </property>
    </bean>
    
    <!-- access sessionFactory -->
    <bean id="aceessSessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource3" />
        <property name="hibernateProperties">
            <props>
                <!-- access 语法和MSSQL相似 所以用的MSSQL方言，或者可以使用第三方方言 -->
                <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
                <prop key="hibernate.jdbc.batch_size">30</prop>
                <prop key="hibernate.jdbc.fetch_size">50</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">false</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop><!--create validate -->
                <prop key="hibernate.query.substitutions">true 1, false 0</prop>
                <prop key="hibernate.cglib.use_reflection_optimizer">true</prop>
                <!-- <prop key="hibernate.cache.use_second_level_cache">true</prop> -->
                <!-- <prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</prop> -->
                <!-- <prop key="hibernate.cache.use_query_cache">true</prop> -->
                <!-- <prop key="hibernate.generate_statistics">true</prop> -->
                <!-- <prop key="hibernate.cache.provider_configuration_file_resource_path">classpath:ehcache.xml</prop> -->
            </props>
        </property>
    </bean>

package lhp.example.junit;

import static org.junit.Assert.*;
import java.sql.DatabaseMetaData;
import lhp.example.context.ContextHolder;
import lhp.example.context.DBType;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class ServiceTest {
    private ApplicationContext context;
    //三个数据源的URL
    private String dataSource1_URL = "jdbc:mysql://127.0.0.1:3306/dec";
    private String dataSource2_URL = "jdbc:mysql://127.0.0.1:3306/lms";
    private String dataSource3_URL = "jdbc:odbc:accessTest";
    private SessionFactory mysqlSessionFactory;
    private SessionFactory aceessSessionFactory;

    @Before
    public void setUp() throws Exception {
        // 选择数据源初始化spring
        ContextHolder.setDbType(DBType.dataSource1);
        //
        String[] xmlFiles = new String[] { 
                "applicationContext-dataSource.xml",
                "applicationContext-hibernate.xml",
                "applicationContext-spring.xml" };
        //
        context = new ClassPathXmlApplicationContext(xmlFiles);
        //
        mysqlSessionFactory = (SessionFactory) context.getBean("mysqlSessionFactory");
        aceessSessionFactory = (SessionFactory) context.getBean("aceessSessionFactory");
    }

    @SuppressWarnings("deprecation")
    @Test
    public void mysqlDataSourceTest() {
        try {

            Session mysqlSession = mysqlSessionFactory.openSession();
            // 获得数据库元数据
            DatabaseMetaData meatData = mysqlSession.connection().getMetaData();

            // 默认启动数据源 dataSource1
            //断言当前数据源URL是否是dataSource1的URL
            assertEquals(dataSource1_URL, meatData.getURL());

            // 切换到数据源 dataSource2
            ContextHolder.setDbType(DBType.dataSource2);
            mysqlSession = mysqlSessionFactory.openSession();
            meatData = mysqlSession.connection().getMetaData();
            //断言当前数据源URL是否是dataSource2的URL
            assertEquals(dataSource2_URL, meatData.getURL());

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    @SuppressWarnings("deprecation")
    @Test
    public void accessDataSourceTest() {
        try {
            Session accessSession = aceessSessionFactory.openSession();
            // 获得数据库元数据
            DatabaseMetaData meatData = accessSession.connection().getMetaData();
            //断言当前数据源URL是否是dataSource3的URL
            assertEquals(dataSource3_URL, meatData.getURL());


        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}