A, mysql5.7.27 install version
1. Download Links: https://dev.mysql.com/downloads/windows/installer/8.0.html
2. Click to download may choose not to log in directly download
3. Locate your downloaded double click to install the software to install mysql
4. Check the following interface I accpet the license terms, click Next
5. Select the type of demand you need based, click Next
Develop Default: the default type of development , installation MySQL server and MySQL application development tools needed. Tools include the development and management server GUI workstations, connect to the server access and manipulate data in Excel plug-in VisualStudio IDE plug-ins by NET / Java / C / C ++ / OBDC such as access to data, examples and tutorials, developer documentation.
Server only: install only the MySQL server for deploying MySQL server.
Client only: Only install the client for MySQL-based application development situation already existing.
Full: install all available components of MySQL .
Custom: Since component definitions need to be installed.
6. Click Execute execution
7. Check the consent click install
8. Click Finish again
9. Click Next again
10. Click Execute execution, waiting for execution is complete, click Next
11. Click Next again, and then according to their needs, select Next Next
12. Select the type of development you want to configure your computer, click Next
如果已经安装了MySQL数据库任何一个版本，已经占用该监听端口，就会再下一步出现错误，有两种选择，要么修改监听接口号，要么卸载之前安装过的MySQL数据库版本。（其他服务器不会默认使用3306为监听端口）
13.设置root用户密码，以及确认密码（密码最小长度为四个字符），点击Next
14.点击Next
15.点击Execute，再点击完成
16.再点击Next，再点击Finish，再点击Next
17.验证你之前设置的密码，check是否通过
18.验证后有提示连接成功，再点击Next
19.再点击Execute
20.再点击Finish，再点击Next，再点击Finish
21.跳出来两个界面，就表示安装成功了。这个时候你可以在你的电脑开始菜单栏有mysql命令窗口MySQL5.7 Command Line Client点击
22.输入你设置的密码
23.密码正确出现如下页面则成功进入mysql，安装成功
