YII use beforeSave and beforeValidate function as common for all Model

Create a file suppose named 'MyActiveRecord.php' suppose in 'components' folder.

<?php
class MyActiveRecord extends CActiveRecord {
    public function beforeValidate()
    {
        if(parent::beforeValidate())
        {
            /* Do some common work */
            return true;
        }
    }
    function beforeSave() {
        if (parent::beforeSave()) {
            if($this->isNewRecord) {
                $maxOrderNumber = Yii::app()->db->createCommand()
                ->select('max(id) as max')
                ->from($this->tableName())
                ->queryScalar();
              $this->id = intval($maxOrderNumber) + 1;
            }
        }
        return true;
    }
}
?>

Now create a Model named 'Email' in 'models' folder.
See the highlighted extends object that is the previous one.
The MyActiveRecord does when a new Email inserted to database, set its id as
current id+1 as new id.

<?php
class Email extends MyActiveRecord {
    public static function model($className=__CLASS__)
    {
        return parent::model($className);
    }
    public function tableName()
    {
        return 'email';
    }
    public function rules()
    {
        return array(
            array('address, contact_id, contact_user_id', 'required'),
            array('contact_id, contact_user_id', 'numerical'),
            array('address, email_label', 'length', 'max'=>250),
            array('email_label, address', 'safe', 'on'=>'search')
        );
    }
    public function attributeLabels()
    {
        return array(
            "address" => "Address",
            "email_label" => "Category"
        );
    }
    
    public function findByParameters($parameters)
    {
        $criteria=new CDbCriteria;
        foreach ($parameters as $key => $value) {
            $criteria->compare($key, $value,true);
        }                
        return new CActiveDataProvider($this, array(
            'criteria'=>$criteria
        ));
    }
}
?>