CDbCriteria示范代码之一

// 返回符合条件记录的件数$account_cnt = Student::model()->count("age=:age and sex=:sex ",array(        ':age'=>trim($age),        ':sex'=>trim($sex),    ));// 返回该条件下的记录是否存在$criteria = new CDbCriteria;$criteria->condition = "age=:age and sex=:sex and type in ('1','2')";$criteria->params = array(':isp_id'=>yii::app()->user->getState('ispid'),        ':age'=>trim($age),        ':sex'=>trim($sex),    );$isExsit = Student::model()->exists($criteria);