mysql Access denied for user 'root'@'localhost' (using password: YES)

【现象说明】

C/S程序远程访问正常，本地访问报如下异常

MySql.Data.MySqlClient.MySqlException (0x80004005): Authentication to host 'localhost' for user 'root' using method 'mysql_native_password' failed with message: Access denied for user 'root'@'localhost' (using password: YES) ---> MySql.Data.MySqlClient.MySqlException (0x80004005): Access denied for user 'root'@'localhost' (using password: YES)

配置文件以下：

<add name="RemoteConnString" connectionString="Database='mealbooker';Data Source='localhost';User Id='root';Password='123456';charset='gb2312';pooling=true" providerName="MySql.Data.MySqlClient"/>

【分析】

权限问题吧，查看下mysql数据库中的user表

发现localhost下面值为空，因而connection string中的localhost 改成 127.0.0.1，测试经过~~~

【解决】

配置文件中改成localhost，访问数据库正常；同时mysql command line工具输入密码后一闪而过问题同时解决。

重启以后又访问不了，继续上面的思路修改：

另，mysql command line工具一闪而过，方法参见这里

另外一个权限相关问题：

Error Code: 1370 execute command denied to user 'root'@'localhost' for routine

使用grant execute on procedure/function dbname.fname TO 'root'@'localhost';

另外一密码相关问题(调试机放几天后就无法远程访问了，root密码被改动，不明缘由)：

 Authentication to host '10.10.123.6' for user 'root' using method 'mysql_native_password' failed with message: Access denied for user 'root'@'10.10.123.5' (using password: YES) ---> MySql.Data.MySqlClient.MySqlException (0x80004005): Access denied for user 'root'@'10.10.123.5' (using password: YES)

修改password语句以下：

而后还要给远程用户非配权限

grant all privileges on *.* to 'root'@'%' with grant option;