问题描述
如果我创建用户并授予它对某个数据库的所有权限，但稍后使用该用户登录时，我看不到授予的数据库：
MysqL> show databases;
+--------------------+
| Database |
+--------------------+
| exmaple_database |
| information_schema |
| loginsystem |
| MysqL |
| performance_schema |
| sys |
+--------------------+
6 rows in set (0.00 sec)
MysqL> create user 'example_user'@'localhost' identified with MysqL_native_password by 'password';
Query OK,0 rows affected (0.01 sec)
MysqL> select user,host from MysqL.user;
+------------------+-----------+
| user | host |
+------------------+-----------+
| debian-sys-maint | localhost |
| example_user | localhost |
| MysqL.infoschema | localhost |
| MysqL.session | localhost |
| MysqL.sys | localhost |
| root | localhost |
| www_data | localhost |
+------------------+-----------+
7 rows in set (0.00 sec)
MysqL> grant all on example_database.* to 'example_user'@'localhost';
Query OK,0 rows affected (0.06 sec)
MysqL> flush privileges;
Query OK,0 rows affected (0.01 sec)
MysqL> show grants for 'example_user'@'localhost';
+----------------------------------------------------------------------------+
| Grants for example_user@localhost |
+----------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO `example_user`@`localhost` |
| GRANT ALL PRIVILEGES ON `example_database`.* TO `example_user`@`localhost` |
+----------------------------------------------------------------------------+
2 rows in set (0.00 sec)
MysqL> exit
Bye
$ MysqL -u example_user -p
Enter password:
Welcome to the MysqL monitor. Commands end with ; or \g.
Your MysqL connection id is 18
Server version: 8.0.23-0ubuntu0.20.10.1 (Ubuntu)
copyright (c) 2000,2021,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> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
+--------------------+
1 row in set (0.01 sec)
MysqL>
从上面可以看出，用户被授予 example_database，但是当使用 example_user 登录并被授予 show databases; 时，example_database 没有显示。有什么理由吗？ https://www.digitalocean.com/community/tutorials/how-to-install-linux-apache-mysql-php-lamp-stack-on-ubuntu-20-04 指南（我遵循的指南）建议在创建用户时使用 MysqL_native_password，以便从 PHP 与该用户建立联系。但我不认为这个选项与这个问题有关。
解决方法
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