MySQL8.0大师之路：第9章：MySQL教程-9.1 MySQL从服务器连接与断开
mysql 命令查看MySQL命令的选项：# mysql --help
连接MySQL命令：shell> mysql -h host -u user -p
-h:host 服务器的主机名
-u:user 登录服务器的用户
-p:password 密码
如果是登录本机，-h 可以省略
回车执行后提示输入密码：
Enter password:
执行结果：
# mysql -p
Enter password:
Welcome to the MySQL monitor.Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.19
Copyright (c) 2000, 2020, 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>
mysql>提示告诉您mysql已准备就绪，可以输入SQL语句。
提示：如果是用随机密码登录，首次执行SQL相关语句时，需要修改密码：
mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql> alter user user() identified by '123';
Query OK, 0 rows affected (0.00 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.01 sec)
注意：有些数据库是允许匿名登录的，所以可以执行数据mysql命令登录：
shell> mysql
与MySQL服务器断开：使用命令 quit 或者 \q
mysql> quit
Bye
在Unix 或Linux上可以使用快捷键 Ctrl+D 直接断开。
常见错误：
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
MySQL 服务没有启动。
启动方法：# ./mysql.server start
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