Yii的默認配置為一個數據庫，不過可以很容易的支持多個數據庫的操作，

這為按業務分割數據庫提供了基礎設施。如下所示：

??//cms?DB?connection??
????????'db'?=>?(defined('DB_CONNECTION')???array(??
????????????'connectionString'?=>?DB_CONNECTION,??
????????????'username'?=>?DB_USER,??
????????????'password'?=>?DB_PWD,??
????????????'charset'?=>?'utf8',??
????????????'emulatePrepare'?=>?true,??
????????????'enableParamLogging'?=>?true,??
????????????'schemaCachingDuration'?=>?3600,?//cache?table?schema??
????????????????)?:?array()),??
????????//member?DB?connection??
????????'db_member'?=>?(defined('DB_CONNECTION_MEMBER')???array(??
???????????'class'=>?'CDbConnection'?,?
????????????'connectionString'?=>?DB_CONNECTION_MEMBER,??
????????????'username'?=>?DB_USER_MEMBER,??
????????????'password'?=>?DB_PWD_MEMBER,??
????????????'charset'?=>?'utf8',??
????????????'emulatePrepare'?=>?true,??
????????????'enableParamLogging'?=>?true,??
????????????'schemaCachingDuration'?=>?3600,?//cache?table?schema??
????????????????)?:?array()),

然后在模型中重載getDbConnection函數，比如：

class?Point?extends?CActiveRecord?{??
??
????public?function?getDbConnection()?{???????
??
??????????return?Yii::app()->db_member;??
????}??
????...??
}

如果有很多模型會使用db_member, 可以從CActiveRecord派生一個子類:CMemberActiveRecord, 把getDbConnection的重寫放在該AR的子類中。

然后模型都從該CMemberActiveRecord中派生。

多數據庫配置遇到的一個典型的錯誤是：

Object?configuration?must?be?an?array?containing?a class element

原因是配置中非$db的其他數據庫沒有設置class屬性，添加該屬性并設置其值為CDbConnection即可。