Yii2 Log

if (\Yii::$app->request->isPost) {

    $log = new LogCovid();

    $log->username = \Yii::$app->user->identity->username;

    $log->datetime = date('Y-m-d H:i:s');

    $log->ip = \Yii::$app->request->getUserIP();

$sql2 = "INSERT INTO users_covid_log (username, ip, date_login) VALUES ('$log->username','$log->ip' ,'$log->datetime')";

        Yii::$app->db->createCommand($sql2)->execute();