Yii2:how to use model's data in layouts

I want to add my database's data in layouts ,how to do it?thanks. I know the way such as $this->params['params'] = "params",but in function like beforeAction

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Solution

The question isn't quite clear. Show your layout and data which you want to use.

Here are many different ways to use data in layout:

Using widgets. You can create own widget, it's simple
Using application components or application itself. For example \Yii::$app->params (you mentioned this in question)
Using $this variable (\yii\web\View), for example it's common practice to use $this->title which can be assigned in controller
Using View data. Layout have access to all params passed to view. This can be acceptable if you have some data format convention for all controllers

Which of them is the right one for you depens on the problem you solve.