Database Exception – yii\db\Exception [ 2.0 版本 ]

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打开GII模块的第一行时出错如下（其它行正常）：

Database Exception – yii\db\Exception

SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: NO)
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Caused by: PDOException

SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: NO)

in D:\WWW\yii\b\vendor\yiisoft\yii2\db\Connection.php at line 579