MySQL8.0大师之路：第9章：MySQL教程-9.1 MySQL从服务器连接与断开

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mysql 命令


查看MySQL命令的选项：[root@CentOS8 ~]# 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：

[Shell] 纯文本查看 复制代码

[root@CentOS8 ~]# 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.

[Shell] 纯文本查看 复制代码

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：[root@CentOS8 init.d]# ./mysql.server start