如何防止yii2在调用Yii :: $ app-> user-> id时执行选择查询

Question

When ever I use

Yii::$app->user->id

or

Yii::$app->user->isGuest 

Yii2 execute SELECT * FROM user WHERE id ='4' .

How can I prevent this repetitive query in order to optimize my web app?
Caching or defining global session variable and something like that.

Answer 1

Enable one of the supported cache storages and replace the code return static::findOne(['id' => $id]); you mentioned in your comment with

$db = self::getDb();
return static::getDb()->cache(function ($db) use ($id) {
    return static::find()->where(['id' => $id])->one();
});

For more details, see http://www.yiiframework.com/doc-2.0/guide-caching-data.html