MySQL绿色版安装（mysql-5.7.12-win32）

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-win32\my-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-win32\data2016"
 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-win32\bin

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-win32\bin>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-win32\data2016\HEJT6VWINGVD59M.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