$user = User::model()->findByPk($userId);
$user->username = 'hello world';
$user->password = 'password';
$user->update();

如何在yii中保存新记录？

$user = new User();
$user->username = 'hello world';
$user->password = 'password';
$user->save();

如何删除yii中的记录？

$user = User::model()->findByPk($userId);
$user->delete()