刚创建数据库后，无法以 root 身份访问该数据库

作为 root@localhost

mysql> CREATE USER 'aaa'@'%';
Query OK, 0 rows affected (0.00 sec)

mysql> GRANT USAGE ON * . * TO 'aaa'@'%' WITH MAX_QUERIES_PER_HOUR 0 MAX_CONNECTIONS_PER_HOUR 0 MAX_UPDATES_PER_HOUR 0 MAX_USER_CONNECTIONS 0 ;
Query OK, 0 rows affected (0.00 sec)

mysql> CREATE DATABASE IF NOT EXISTS `aaa` ;
Query OK, 1 row affected (0.00 sec)

mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

mysql> GRANT ALL PRIVILEGES ON `aaa` . * TO 'aaa'@'%';
ERROR 1044 (42000): Access denied for user 'root'@'localhost' to database 'aaa'

发生了什么事..为什么它会给我这个错误？

mysql> show grants;
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Grants for root@localhost                                                                                                                                                                                                                                                                                                                                                                                        |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, SHUTDOWN, PROCESS, FILE, REFERENCES, INDEX, ALTER, SHOW DATABASES, SUPER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '*B67132C4A56F2FFFE0AA531DECF0C98895F9CB9B' WITH GRANT OPTION |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

我过去遇到过这个问题，我的解决方案是显式连接到 127.0.0.1 而不是 localhost 别名

mysql -uroot -h127.0.0.1 

希望这对你有用！