多数据源自动切换，支持数据库连接池的多数据源自动切换

为了方便sessionFactory控制，或进行数据同步等事务。。。。。。。项目需要多个数据库连接池，并使用一个sessionfactory管理。

<bean id="dataSourceXGRWW"  
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">   
        <property name="driverClassName">   
            <value>org.logicalcobwebs.proxool.ProxoolDriver</value>   
        </property>   
        <property name="url">   
            <value>proxool.exchangww</value>   
        </property>   
    </bean>   
      
    <bean id="dataSourceJFWAP"  
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">   
        <property name="driverClassName">   
            <value>org.logicalcobwebs.proxool.ProxoolDriver</value>   
        </property>   
        <property name="url">   
            <value>proxool.exchangwap</value>   
        </property>   
    </bean>
     
    <bean id="dataSource" class="cn.com.xgr.dynamicds.DynamicDataSource">   
       <property name="targetDataSources">   
          <map key-type="java.lang.String">
              <entry key="XGRWW" value-ref="dataSourceXGRWW"/>    
              <entry key="JFWAP" value-ref="dataSourceJFWAP"/>       
          </map>   
       </property>   
       <property name="defaultTargetDataSource" ref="dataSourceJFWAP"/>   
    </bean> 
    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource">
            <ref bean="dataSource"/>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.autoReconnect">true</prop> 
                <!-- Proxool Config --> 
                <prop key="hibernate.proxool.xml">proxool.xml</prop>
                <prop key="hibernate.proxool.existing_pool">true</prop>
                <prop key="hibernate.connection.provider_class">org.hibernate.connection.ProxoolConnectionProvider</prop>    
                <prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.jdbc.fetch_size">50</prop>
                <prop key="hibernate.jdbc.batch_size">25</prop>
                <prop key="hibernate.statement_cache.size">25</prop> 
                <prop key="hibernate.connection.release_mode">after_transaction</prop>
            </props>
        </property>
        <property name="mappingDirectoryLocations">
            <list>
                <value>classpath:cn/com/xgr/po</value>
            </list>
        </property>
</bean>

dataSource由cn.com.xgr.dynamicds.DynamicDataSource动态管理，这是关键

public class DynamicDataSource extends AbstractRoutingDataSource {   
  
    protected Object determineCurrentLookupKey() {   
        // TODO Auto-generated method stub   
        return CustomerContextHolder.getCustomerType();   
    }

    public boolean isWrapperFor(Class<?> iface) throws SQLException {
        // TODO Auto-generated method stub
        return false;
    }

    public <T> T unwrap(Class<T> iface) throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }   
  
}

public class CustomerContextHolder {   
    private static final ThreadLocal contextHolder = new ThreadLocal();   
       
    public static void setCustomerType(String customerType) {   
      contextHolder.set(customerType);   
    }   
       
    public static String getCustomerType() {   
      return (String) contextHolder.get();   
    }   
       
    public static void clearCustomerType() {   
      contextHolder.remove();   
    }   
  
  
}

public class DataSourceMap {     
    public static final String XGRWW = "XGRWW"; //有数据的端口
    public static final String JFWAP = "JFWAP"; //无数据的端口
}  

在需要使用的时候只需要提前切换即可

CustomerContextHolder.setCustomerType(DataSourceMap.JFWAP);//设置数据源

  this.updateJFApplyMainByCheckstate(jfmVo, jfmPo);//更新wap.Checkstate字段

 CustomerContextHolder.setCustomerType(DataSourceMap.XGRWW);//设置数据源        

当然上面的配置使用了proxool这部分的数据库连接池，不熟悉的可以换成myeclipse自带的数据源配置也是可以的