建完表，连接数据库，登录/注册出错
Database Exception – yii\db\Exception
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'user.username' in 'where clause'
The SQL being executed was: SELECT EXISTS(SELECT * FROM `user` WHERE `user`.`username`='123123')
Error Info: Array( [0] => 42S22 [1] => 1054 [2] => Unknown column 'user.username' in 'where clause')
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Caused by: PDOException
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'user.username' in 'where clause'
in D:\wamp64\www\asd.com\vendor\yiisoft\yii2\db\Command.php at line 1290
