Ubuntu下MySQL连接问题

记录一下~~

新手,在学python中,之前学到mysql操作,遇到一个有点迷得问题:

在sudo下mysql操作(root下运行),一切正常.

就在我用普通用户shell下运行出现以下错误:

mysql -uroot -pmysql

mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 1698 (28000): Access denied for user 'root'@'localhost'

还是我在ipython中连接才意识到有问题的,之前查阅信息说是权限问题，折腾之后问题依旧~~无奈

import pymysql
conn = pymysql.connect(host='127.0.0.1',port=3306,
                       user='root',password='mysql',
                       database='mysql',charset='utf8')    
InternalError: (1698, "Access denied for user 'root'@'localhost'")

那这个问题怎么搞?

MySQL库里有张表(user)是专门放用户信息(用户名,密码,权限等等).

问题就在root用户plugin的值auth_socket,应该是一种安全措施,其他以后在多多了解吧!

执行以下代码,重启mysql就好了:

update mysql.user set authentication_string=PASSWORD('NewPassword'), plugin='mysql_native_password' where user='root';

flush privileges;

mysql> select user,plugin from mysql.user;
+------------------+-----------------------+
| user             | plugin                |
+------------------+-----------------------+
| root             | auth_socket           |
| mysql.session    | mysql_native_password |
| mysql.sys        | mysql_native_password |
| debian-sys-maint | mysql_native_password |
| root             | mysql_native_password |
+------------------+-----------------------+
5 rows in set (0.02 sec)

mysql> update mysql.user set authentication_string=PASSWORD('NewPassword'), plugin='mysql_native_password' where user='root';
Query OK, 2 rows affected, 1 warning (0.13 sec)
Rows matched: 2  Changed: 2  Warnings: 1

mysql> flush privileges;
Query OK, 0 rows affected (0.02 sec)

sudo service mysql restart

在shell中,不用权限就可连接库了,Python也可以了,下面是效果.

mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.25-0ubuntu0.18.04.2 (Ubuntu)

Copyright (c) 2000, 2019, 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> 

In [1]: import pymysql                                      

In [2]: con = pymysql.connect(host='127.0.0.1',port=3306,use
   ...: r='root',password='ohmysql',database='mysql',charset
   ...: ='utf8')