php - 将数据保存到数据库

Question

我有这个操作，我希望将 $newtkamount 保存到数据库中，我尝试使用与我的注册页面相同的代码(显然指向不同的表)，但我无法解决这个问题。需要根据当前用户的user ID覆盖已经存在的值

public function actionBuy($qty=0) {
    $_id = Yii::app()->user->getId();
    $model = Tokens::model()->findByAttributes(array('UserID' => $_id));
    if ($model === null)
        throw new CHttpException(404, "Keep calm! If you havent bought tokens before this is normal");


    $this->render('buy', array(
        'model' => $model,));

    if (strtoupper($_SERVER['REQUEST_METHOD']) == 'POST'){
        $_qty = $_POST['qty'];
        $newtkamount = ($model->TokenAmount + $_qty);

        echo $newtkamount . $model->TokenAmount;
    }
}

Answer 1

始终在保存数据后渲染，并且不要在 Controller 中使用 echo。

public function actionBuy($qty=0) {
    $_id = Yii::app()->user->getId();
    $model = Tokens::model()->findByAttributes(array('UserID' => $_id));
    if ($model === null)
        throw new CHttpException(404, "Keep calm! If you havent bought tokens before this is normal");

    if (strtoupper($_SERVER['REQUEST_METHOD']) == 'POST'){
        $_qty = $_POST['qty'];
        $model->TokenAmount = ($model->TokenAmount + $_qty);
        $model->save(false);
    }

    $this->render('buy', array(
        'model' => $model));
}