用YII2搭建的项目，在登之后，每次刷新页面或者去其它页面的时候，都会执行SELECT * FROM USER WHERE ID = 1（当然，ID会根据当前登录的用户ID变化），这样有啥好处或者为啥要这样？（因为我之前做项目都是登录之后就判断session，不会每次都去数据库查询）
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用YII2搭建的项目，在登之后，每次刷新页面或者去其它页面的时候，都会执行SELECT * FROM USER WHERE ID = 1（当然，ID会根据当前登录的用户ID变化），这样有啥好处或者为啥要这样？（因为我之前做项目都是登录之后就判断session，不会每次都去数据库查询）
个人之前一直使用Yii1，第二版没有仔细用于项目过。
假设某用户在线时，被后台管理员删除，此时他的session是还是有效的，所以此用户不会实时被踢出；
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