如何解决mysqld：不能将目录更改为数据服务器无法启动？
由于您使用Windows安装程序，因此一切都已设置为可将MysqL 5.7作为Windows服务运行，这在大多数情况下是一个不错的选择。
而不是MysqLd.exe从命令行运行，
Win + R
跑 services.msc
右键点击 MysqL57
启动服务。
解决方法
我使用安装程序安装了MySQL服务器，然后启动了该服务器。重新启动后，我尝试再次启动它并得到错误：
D:\Program Files\MySQL\MySQL Server 5.7\bin>mysqld -u root -p
mysqld: Can't change dir to 'D:\Program Files\MySQL\MySQL Server 5.7\data\' (Errcode: 2 - No such file or directory)
2015-11-17T08:30:18.822962Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2015-11-17T08:30:18.822962Z 0 [Warning] Insecure configuration for --secure- file -priv: Current value does not restrict location of generated files. Consider setting it to a valid,non-empty path.
2015-11-17T08:30:18.822962Z 0 [Note] mysqld (mysqld 5.7.9) starting as process 1108 ...
2015-11-17T08:30:18.838586Z 0 [Warning] Can't create test file D:\Program Files\MySQL\MySQL Server 5.7\data\DESKTOP-RNBR3E8.lower-test
2015-11-17T08:30:18.838586Z 0 [Warning] Can't create test file D:\Program Files\MySQL\MySQL Server 5.7\data\DESKTOP-RNBR3E8.lower-test
2015-11-17T08:30:18.838586Z 0 [ERROR] failed to set datadir to D:\Program Files\MySQL\MySQL Server 5.7\data\
2015-11-17T08:30:18.838586Z 0 [ERROR] Aborting
2015-11-17T08:30:18.838586Z 0 [Note] Binlog end
2015-11-17T08:30:18.838586Z 0 [Note] mysqld: Shutdown complete
我试图重新安装MySQL。
更新：
当我mysqld -u root -p以管理员身份运行时，什么都没有发生。
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