MySQL 5.7.21安装与密码设置（图文版）
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2022-05-01 20:12:25
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1.解压MySQL 5.7.20安装包，如X:\MySQL\mysql-5.7.21-winx64。（是没有data和my.ini的）
2.配置mysql的环境变量，创建MYSQL_HOME，并且在Path添加上%MYSQL_HOME%\bin;
3，配置my.ini. 并把my.ini放到bin目录下（1.如果放在mysql-5.7.21-winx64 目录下，在下面执行
net start mysql时可能无法启动MYSQL服务 2.不会自动生成data）
[client]
default-character-set=utf8
[mysqld]
#解压目录 如：D:\MySQL\mysql-5.7.21-winx64
basedir = %MYSQL_HOME%
#解压目录 如：D:\MySQL\mysql-5.7.21-winx64\data
datadir = %MYSQL_HOME%\data
port = 3306
default-character-set=utf8
4. 以管理员身份进入命令行（可在小娜搜索输入cmd找到），并进入X:\MySQL\mysql-5.7.21-winx64\bin目录下输入命令：mysqld
--initialize-insecure (生成无密码的root用户) 后，在mysql-5.7.20-winx64 目录下就会出现data文件
5.再输入mysqld --install，如果出现Service
successfully installed 说明注册成功了。
注意：如果此操作报错Install/Remove
of the Service Denied!，建议使用管理员身份进入命令提示符
6.启动MySQL服务 ，命令：net start mysql
7.设置密码
mysqladmin -u root password 密码
8.修改密码方法如下 ：接着输入mysql -uroot -p 由于之前登陆过，直接输入刚才设置密码（登录root第一次是免密码的直接回车进入到） MYSQL>
接着输入：update mysql.user set authentication_string=password('你想输入的密码')
where user='root' and Host
='localhost'; 然后接着再输入
: flush privileges;
9.输入命令 show databases; 查看数据表
MySQL常用的命令如下
List of all MySQL commands:
Note that all text commands must be first on line and end with ';'（要以“;”结尾）
? (\?) Synonym for `help'.
clear (\c) Clear the current input statement.
connect (\r) Reconnect to the server. Optional arguments are db and host.
delimiter (\d) Set statement delimiter.
ego (\G) Send command to mysql server, display result vertically.
exit (\q) Exit mysql. Same as quit.
go (\g) Send command to mysql server.
help (\h) Display this help.
notee (\t) Don't write into outfile.
print (\p) Print current command.
prompt (\R) Change your mysql prompt.
quit (\q) Quit mysql.
rehash (\#) Rebuild completion hash.
source (\.) Execute an SQL script file. Takes a file name as an argument.
status (\s) Get status information from the server.
tee (\T) Set outfile [to_outfile]. Append everything into given outfile.
use (\u) Use another database. Takes database name as argument.
charset (\C) Switch to another charset. Might be needed for processing binlog with multi-byte charsets.
warnings (\W) Show warnings after every statement.
nowarning (\w) Don't show warnings after every statement.
resetconnection(\x) Clean session context.11.关闭MySQL服务,命令：net stop mysql