window环境安装mysql5.7.20

1. 下载免安装的压缩包mysql-5.7.20-winx64.zip

    https://cdn.mysql.com//archives/mysql-5.7/mysql-5.7.20-winx64.zip

2. 解压到相应的目录（此处解压到D:\mysql-5.7.20-winx64）

3. 配置环境变量，将MySQL的启动目录（D:\mysql-5.7.20-winx64\bin）添加到Path中

4. 在MySQL目录下（D:\mysql-5.7.20-winx64）创建my.ini文件，内容如下：

[client]
default-character-set = utf8mb4

[mysql]
default-character-set = utf8mb4

[mysqld]
port = 3306

basedir=D:\mysql-5.7.20-winx64

datadir=D:\mysql-5.7.20-winx64\data

max_connections=200

character-set-server=utf8mb4

character-set-client-handshake = FALSE

collation-server = utf8mb4_unicode_ci

init_connect='SET NAMES utf8mb4'

default-storage-engine=INNODB

lower_case_table_names=1

[mysqld_safe]
log-error=D:\mysql-5.7.20-winx64\logs\mysql.log

5.在MySQL目录下（D:\mysql-5.7.20-winx64）创建data和logs文件夹，并在logs文件夹下创建mysql.log文件

6. 管理员身份运行cmd

    切换目录：

C:\Windows\system32>D:
cd D:\mysql-5.7.20-winx64\bin

7.安装Mysql为Windows 服务

D:\mysql-5.7.20-winx64\bin>mysqld -install
Service successfully installed.

8.初始化Mysql：

D:\mysql-5.7.20-winx64\bin>mysqld --initialize-insecure --user=mysql

9.启动mysql服务

C:\Windows\system32>net start mysql
MySQL 服务正在启动 .
MySQL 服务已经启动成功。

10. 登录数据库（默认密码为空）登陆时直接回车即可

C:\Windows\system32>mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.21 MySQL Community Server (GPL)
 
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
 
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
 
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
 
mysql>

11.修改root用户默认密码

mysql> use mysql;
Database changed
mysql> update user set authentication_string=password("新密码") where User="root";
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 1
mysql> 

12.刷新权限让修改立即生效

mysql>FLUSH PRIVILEGES;