按照我之前安装5.6的安装方法（MySQL免安装版下载与配置）安装5.7的时候出现问题：
mysql服务无法启动，服务没有报任何错误
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" alt="" />
其实在这学期开始学习mysql的时候，就听老师同学说，登录不了的问题，当时没有在意，也是因为电脑上早就安装了mysql5.6，也就没有在意这个问题。这两天win10系统出问题，重装了win7，安装5.7的时候出现了这个问题。
之前的版本默认密码为空，具体版本不太清楚，反正5.6密码是空。5.7的安全性提升，在linux安装5.7的时候，安装完成后会生成一个随机性密码，存储在root/.mysql_secret中，如果没有这个文件，去系统日志中查找password，就应该能找到。
但是windows下就不知道如何解决了，不过最后还是找到了解决方法。
解决方法：
来自：windows MySql 5.7.9，启动不了。缺少data
然而并不是缺少data文件夹，将my-default.ini文件改名为my.ini，移动到bin/目录下，在bin/下执行命令 mysqld --initialize --user=mysql --console ，这条命令估计是初始化的命令
然后启动服务 net start mysql
命令行显示贴在这
Microsoft Windows [版本 6.1.]
版权所有 (c) Microsoft Corporation。保留所有权利。 C:\Windows\system32>cd .. C:\Windows>cd .. C:\>cd mysql-5.7.-winx64/Boot
系统找不到指定的路径。 C:\>cd mysql-5.7.-winx64\bin C:\mysql-5.7.-winx64\bin>mysqld install
Service successfully installed. C:\mysql-5.7.-winx64\bin>net start mysql
MySQL 服务正在启动 .
MySQL 服务无法启动。 服务没有报告任何错误。 请键入 NET HELPMSG 以获得更多的帮助。 C:\mysql-5.7.-winx64\bin>net start mysql
MySQL 服务正在启动 .
MySQL 服务无法启动。 服务没有报告任何错误。 请键入 NET HELPMSG 以获得更多的帮助。 C:\mysql-5.7.-winx64\bin>mysqld --initialize --user=mysql --console
--21T14::.922112Z [Warning] TIMESTAMP with implicit DEFAULT value is
deprecated. Please use --explicit_defaults_for_timestamp server option (see doc
umentation for more details).
--21T14::.669315Z [Warning] InnoDB: New log files created, LSN= --21T14::.106116Z [Warning] InnoDB: Creating foreign key constraint
system tables.
--21T14::.308916Z [Warning] No existing UUID has been found, so we a
ssume that this is the first time that this server has been started. Generating
a new UUID: 79c8386d-37b9-11e6--74867a6179b7.
--21T14::.340116Z [Warning] Gtid table is not ready to be used. Tabl
e 'mysql.gtid_executed' cannot be opened.
--21T14::.355716Z [Note] A temporary password is generated for root@
localhost: rr9.8h74twfR C:\mysql-5.7.-winx64\bin>mysql -uroot -prr9.8h74twfR
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR (HY000): Can't connect to MySQL server on 'localhost' (10061) C:\mysql-5.7.-winx64\bin>net start mysql
MySQL 服务正在启动 .
MySQL 服务已经启动成功。 C:\mysql-5.7.-winx64\bin>mysql -uroot -prr9.8h74twfR
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is
Server version: 5.7. Copyright (c) , , Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> set password=password('');
Query OK, rows affected, warning (0.00 sec) mysql> exit
Bye C:\mysql-5.7.-winx64\bin>mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is
Server version: 5.7. MySQL Community Server (GPL) Copyright (c) , , Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> exit
Bye C:\mysql-5.7.-winx64\bin>