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今天安装了MYSQL5.7，网上说会在root目录生成随机密码,可是俺没找到,又到网上搜了一阵,结果说的更改ROOT密码的方法都不可行，还好找到了下边的这篇文章，感谢原作者！原文地址：http://blog.csdn.net/channingzhao/article/details/50352545 请直接查看第二部份的第4小节，我用红字标识过了！ 一、如何安装？
1、【运行】->【cmd】打开小黑窗口。定位到MySQL安装目录【我的D:\Program Files\mysql-5.7.9-winx64】的bin目录下，输入【mysqld -install】。如下图，表示安装成功
2、打开MySQL安装目录，找到【my-default.ini】，配置一些简单的信息。
- # These are commonly set, remove the # and set as required.
- basedir = D:\Program Files\mysql-5.7.9-winx64
- datadir = D:\Program Files\mysql-5.7.9-winx64\data
- port = 3306
- # server_id = .....
3、输入【mysqld --initialize】，为MySQL进行初始化。初始化过程可能需要持续一会，当出现如下界面，且在MySQL安装目录中的data文件夹有内容时，表示成功初始化了。
如果略去该步骤，在尝试通过命令【mysqld --console】追踪错误信息时会出现如下错误。由于新版本的MySQL在启动时需要初始化一写表。因此，请不要省略此步骤。
- D:\Program Files\mysql-5.7.9-winx64\bin><span style="color:#ff6666;"><strong>mysqld --console</strong></span>
- mysqld: Can't change dir to 'D:\Program Files\mysql-5.7.9-winx64\data\' (Errcode
- : 2 - No such file or directory)
- 2015-12-18T08:54:25.263539Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is
- deprecated. Please use --explicit_defaults_for_timestamp server option (see doc
- umentation for more details).
- 2015-12-18T08:54:25.263539Z 0 [Warning] Insecure configuration for --secure-file
- -priv: Current value does not restrict location of generated files. Consider set
- ting it to a valid, non-empty path.
- 2015-12-18T08:54:25.263539Z 0 [Note] mysqld (mysqld 5.7.9) starting as process 6
- 3944 ...
- 2015-12-18T08:54:25.265539Z 0 [Warning] <span style="color:#ff6666;">Can't create test file D:\Program Files\
- mysql-5.7.9-winx64\data\Richard-PC.lower-test</span>
- 2015-12-18T08:54:25.265539Z 0 [Warning]<span style="color:#ff6666;"> Can't create test file D:\Program Files\
- mysql-5.7.9-winx64\data\Richard-PC.lower-test</span>
- 2015-12-18T08:54:25.266539Z 0 [ERROR] failed to set datadir to <span style="color:#ff6666;">D:\Program Files\
- mysql-5.7.9-winx64\data\</span>
- 2015-12-18T08:54:25.266539Z 0 [ERROR] Aborting
-
- 2015-12-18T08:54:25.266539Z 0 [Note] Binlog end
- 2015-12-18T08:54:25.267539Z 0 [Note] mysqld: Shutdown complete
4、输入【mysqld -install】安装MySQL服务。具体启动过程略。
二、无法运行？
在成功启动MySQL后，通过连接MySQL数据库出现如下错误
- 1045- access denied for user 'root'@'localhost' using password yes
按照网上的方式，结合自己的实操经验，总结如下解决办法
1、首先输入【mysqld --skip-grant-tables】，这条命令是作用了跳过认证直接进入（启动）MySQL。
2、尝试 输入【update user set password=PASSWORD('123456') where user='root';】。尝试修改Root密码为123456。
可能出现的错误。因此，此步骤不可解决问题。
- ERROR 1054 (42S22): Unknown column 'password' in 'field list'
3、尝试输入【GRANT ALL ON *.* to 'root'@'localhost' IDENTIFIED BY '11111' with grant option;】
- ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables opt
- ion so it cannot execute this statement
如果出现上述错误，请输入下面红色标注的命令，设置可读属性
- mysql> <span style="color:#ff6666;">set global read_only=1;</span>
- Query OK, 0 rows affected (0.00 sec)
-
- mysql> <span style="color:#ff6666;">flush privileges;</span>
- Query OK, 0 rows affected (0.00 sec)
然后在输入【GRANT ALL ON *.* to 'root'@'localhost' IDENTIFIED BY '11111' with grant option;】
出现如下错误。
- mysql> GRANT ALL ON *.* to 'root'@'localhost' IDENTIFIED BY '11111' with grant o
- ption;
- ERROR 1131 (42000): You are using MySQL as an anonymous user and anonymous users
- are not allowed to change passwords
4、第三步不可行的时候，可尝试换种思路解决。重新建立一个管理员权限的账户，(我这边用的时richard,按需修改）
mysql> GRANT ALL ON *.* to 'richard'@'localhost' IDENTIFIED BY '11111' with grant option; Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> flush privileges; Query OK, 0 rows affected (0.00 sec) 然后重启MySQL数据库，用新建的管理员账户【richard】登录。
连接成功
5、用【richard】账户登录，并为root账户修改密码。 - GRANT ALL ON *.* to 'root'@'localhost' IDENTIFIED BY '11111' with grant option;
- flush privileges;
6、测试root账户连接成功，问题解决！
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