安装过程：
1. 官网下载5.15.7， http://dev.mysql.com/downloads/， 选择开源社区版：MySQL Community Server (GPL)
2. 我解压后放在 E:\mysql\5.7.15\ 下面
3. 将E:\mysql\5.7.15\bin加入系统path
4. 安装mysql服务: mysqld --install
5. 编辑E:\mysql\5.7.15\my.ini文件
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the
# *** default location during install, and will be replaced if you
# *** upgrade to a newer version of MySQL. [mysqld] basedir = E:/mysql/5.7.
datadir = E:/mysql/data
port = sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
6. 用管理员身份打开cmd命令窗口
7. 初始化mysql: mysqld --initialize
8. 启动mysql服务： net start mysql
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遇到的问题：
问题1：
E:\mysql\5.7.>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。 E:\mysql\5.7.>net helpmsg 服务没有报告任何错误。
问题2：
这个错误没有仍和日志记录，原因是my.ini中datadir所设定的目录不存在，路径分隔符需要采用linux格式“/”, 而不是“\"
如果mysql找不到这个data目录, 那么初始化会出错：
E:\mysql\5.7.\bin>mysqld --initialize
mysqld: Can't create directory 'E:\myusql\data\' (Errcode: 2 - No such file or directory)
--16T07::.476808Z [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
--16T07::.476808Z [Warning] 'NO_ZERO_DATE', 'NO_ZERO_IN_DATE' and 'ERROR_FOR_DIVISION_BY_ZERO' sql modes should be used with strict mode. They will be merged with strict mode in a future release.
--16T07::.476808Z [Warning] 'NO_AUTO_CREATE_USER' sql mode was not set.
--16T07::.492808Z [ERROR] Aborting
问题3： data目录非空，也会初始化也会出错：
E:\mysql\5.7.\bin>mysqld --initialize
--16T07::.306817Z [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
--16T07::.306817Z [Warning] 'NO_ZERO_DATE', 'NO_ZERO_IN_DATE' and 'ERROR_FOR_DIVISION_BY_ZERO' sql modes should be used with strict mode. They will be merged with strict mode in a future release.
--16T07::.306817Z [Warning] 'NO_AUTO_CREATE_USER' sql mode was not set.
--16T07::.310106Z [ERROR] --initialize specified but the data directory has files in it. Aborting.
--16T07::.318664Z [ERROR] Aborting