利用spring+ibatiS技术，在spring中配置多个数据源，并实现动态切换。

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spring中xml文件中的配置：
<bean id="dataSource1"
class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass"><value>oracle.jdbc.driver.OracleDriver</value></property>

  <property name="jdbcUrl"><value>jdbc:oracle:thin:@127.0.0.1:1521:ORACLE</value></property>
  <property name="user"><value>htctposp</value></property>
  <property name="password"><value>htctposp</value></property>
  <property name="minPoolSize"><value>1</value></property>
  <property name="maxPoolSize"><value>5</value></property>
  <property name="maxIdleTime"><value>1800</value></property>
  </bean>
   <bean id="dataSource2" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.MySQL.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/mysql?characterEncoding=UTF8"></property>
        <property name="username" value="root"></property>
        <property name="password" value="1111"></property>
    </bean>

    <bean id="dataSource" class="com.huateng.util.DynamicDataSource">
         <property name="targetDataSources">
          <map key-type="Java.lang.String">
                <entry key="dataSource1" value-ref="dataSource1"/>
                 <entry key="dataSource2" value-ref="dataSource2"/>
             </map>
          </property>
          <property name="defaultTargetDataSource" ref="dataSource1"/>
   </bean>

写两个工具类DbContextHolder和DynamicDataSource，如下：
public class DynamicDataSource extends AbstractRoutingDataSource{

static Logger log=Logger.getLogger("DynamicDataSource");
/* (non-Javadoc)
* @see org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource#determineCurrentLookupKey()
*/
protected Object determineCurrentLookupKey() {
return DbContextHolder.getDbType();
}

}
public class DbContextHolder {
private static final ThreadLocal contextHolder = new ThreadLocal();

public static void setDbType(String dbType){
  contextHolder.set(dbType);
}

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

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

}

一般在调用service层之前就要切换数据库（一般要在action中），切换数据库的代码：
DbContextHolder.setDbType("dataSource2");

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