首先让我提一下，我已经看了很多建议的问题，但没有找到相关的答案。这就是我正在做的。
我连接到Amazon EC2实例。我可以用这个命令登录MySQL根目录:
mysql -u root -p
然后我用host %创建了一个新的用户帐单
CREATE USER 'bill'@'%' IDENTIFIED BY 'passpass';
授予用户bill的所有权限:
grant all privileges on *.* to 'bill'@'%' with grant option;
然后我退出root用户，尝试用bill登录:
mysql -u bill -p
输入正确的密码并得到以下错误:
错误1045(28000):用户“账单”@“localhost”(使用密码:YES)的访问被拒绝
当前回答
如果MySQL运行在不区分大小写的操作系统(如Windows)上，也可能发生这种情况。
例:我发现尝试使用这些凭据连接到数据库失败:
mysql>授予数据库ev105的select权限。*到'specialuser'，标识为's3curepa5wrd';
$ mysql -specialuser' -p's3curepa5wrd' -h10.61.130.89 databaseV105
错误1045(28000):拒绝访问用户'specialuser'@'10.0.1.113'(使用密码:YES)
但是，这成功了:
Mysql >授予select权限*到'specialuser'，标识为's3curepa5wrd';
mysql ' - h10300,300,400 database105 -p
输入密码:
其他回答
如果您忘记密码或想修改密码。你可以遵循以下步骤:
1 :stop your mysql [root@maomao ~]# service mysqld stop Stopping MySQL: [ OK ] 2 :use “--skip-grant-tables” to restart mysql [root@mcy400 ~]# mysqld_safe --skip-grant-tables [root@cy400 ~]# Starting mysqld daemon with databases from /var/lib/mysql 3 : open a new window and input mysql -u root [root@cy400 ~]# mysql -u root Welcome to the MySQL monitor. Commands end with ; or \g. 4 : change the user database mysql> use mysql Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed 5 : modify your password your new password should be input in "（）" mysql> update user set password=password('root123') where user='root'; Query OK, 3 rows affected (0.00 sec) Rows matched: 3 Changed: 3 Warnings: 0 6 : flush mysql> flush privileges; 7: quit mysql> quit Bye 8: restart mysql [root@cy400 ~]# service mysqld restart; Stopping MySQL: [ OK ] Starting MySQL: [ OK ]
宾果!你可以用用户名和新密码连接你的数据库:
[root@cy400 ~]# mysql -u root -p <br>
Enter password: admin123 <br>
Welcome to the MySQL monitor. Commands end with ; or \g. <br>
Your MySQL connection id is 2 <br>
Server version: 5.0.77 Source distribution <br>
Type 'help;' or '\h' for help. Type '\c' to clear the buffer. <br>
mysql> quit <br>
Bye
I discovered yet another case that appears on the surface to be an edge case; I can export to the file system, via SELECT INTO .. OUTFILE as root, but not as regular user. While this may be a matter of permissions, I've looked at that, and see nothing especially obvious. All I can say is that executing the query as a regular user who has all permissions on the data base in question returns the access denied error that led me to this topic. When I found the transcript of a successful use of SELECT INTO … OUTFILE in an old project, I noticed that I was logged in as root. Sure enough, when I logged in as root, the query ran as expected.
对我来说，root有一个默认密码
我用ALTER USER 'root'@'localhost' IDENTIFIED BY 'new password '修改密码;这个方法奏效了
如果您的dbname、用户名、密码等字符串长度超过https://dev.mysql.com/doc/refman/5.7/en/grant-tables.html#grant-tables-scope-column-properties上列出的值，您也可能无法登录，就像我的情况一样。
我也有同样的问题，但在我的情况下，解决方案是由eggyal的评论解决的。我也有一个匿名用户，但删除它并不能解决问题。'FLUSH PRIVILEGES'命令仍然有效。
让我感到惊讶的是，我用MySQL Workbench创建了这个用户，我本来希望它能执行完成任务所需的所有功能。
