MySql笔记1：安装启动

1、Mysql客户端安装

安装教程
ps:以下教程基于window

2、启动

1. 进入到bin（上述数据库安装目录）:cd C:\xx\MySQL\MySQL Server 5.7\bin # 否则找不到mysqld(或者配置环境变量)
2. 初始化data目录：mysqld --initialize --user=mysql --console
3. 安装：mysqld -install
4. 启动mysql :net start mysql

1. 若未安装或初始化就启动mysql,则报错：MySQL服务无法启动
2. 初始化data报错：initialize specified but the data directory has files in it. Aborting.,则先删除data 再次初始化

3、命令行登录

Mysql安装成功后，默认的root用户密码为空，你可以使用以下命令来创建root用户的密码：mysql -u root password "new_password";
mysql -h 主机 -u 用户名 -P 端口号(默认3306) -p

C:\WINDOWS\system32>mysql -h localhost -u root -P 3306 -p
Enter password: ******  # 输入密码
Welcome to the MySQL monitor.  Commands end with ; or \g.  # 表示登录成功
Your MySQL connection id is 3
Server version: 5.7.39-log MySQL Community Server (GPL)

Copyright (c) 2000, 2022, Oracle and/or its affiliates.

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>

C:\WINDOWS\system32>mysql -u root -p
Enter password: ****
ERROR 2003 (HY000): Can't connect to MySQL server on 'localhost' (10061)
==> 先确定mysql服务是否启动（服务-mysql,确认状态是否是正在运行）
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
==>密码错误

4、退出登录

exit或quit

mysql> quit
Bye