1. 从官网下载安装包：mysql-5.7.12-win32.zip
2. 解压到C盘（任意盘符都行）
C:mysql-5.7.12-win32
3. 修改配置文件：C:mysql-5.7.12-win32my-default.ini
# 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]
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
innodb_buffer_pool_size = 128M
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
# These are commonly set, remove the # and set as required.
basedir = "C:mysql-5.7.12-win32"
datadir = "C:mysql-5.7.12-win32data2016"
port = 3306
# server_id = ...
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
join_buffer_size = 128M
sort_buffer_size = 2M
read_rnd_buffer_size = 2M
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
4. 配置系统环境变量path=....(之前的加上)....;C:mysql-5.7.12-win32in
5. 执行如下命令：
> mysqld --initialize-insecure > mysql -install > net start mysql (或者 net start MySQL)
（如果要重新install，需要先remove：mysql --remove）
6. 如果正常的话，会显示如下信息：
C:mysql-5.7.12-win32in>net start MySQL MySQL 服务正在启动 . MySQL 服务已经启动成功。
如果启动报错，可以看一下mysql的报错日志：C:mysql-5.7.12-win32data2016HEJT6VWINGVD59M.err
新安装的MySQL的root用户的密码是空的，所以可以直接连接：mysql -u root -p