config.php里加多配置
'db2'=>array( 'class'=>'CDbConnection', ),
AR中覆盖方法，设置其它的数据库
特别需要注意 $odb这个独立的处理，否则在连续操作的过层中，会有数据库链接变量冲突的相关问题。
public static $odb=null;
public function getDbConnection()
{
if(self::$odb!==null)
return self::$odb;
else
{
self::$odb=Yii::app()->getComponent('db2');
if(self::$odb instanceof CDbConnection)
return self::$odb;
else
throw new CDbException(Yii::t('yii','Active Record requires a "db" CDbConnection application component.'));
}
}
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