刚刚安装好了mysql数据库，root用户登录没有问题，但是在创建了新的数据库后却无法登录，报“ERROR 1045 (28000): Access denied for user”这样的错误，下面对这个错误进行重演,首先以root用户登录：
[root@zabbix ~]# mysql -uroot -proot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.5.16-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, 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> 然后创建数据库wgldjc：
mysql> create database wgldjc;
Query OK, 1 row affected (0.00 sec)授予权限：
mysql> GRANT ALL PRIVILEGES ON wgldjc.* TO wgldjc@'%' IDENTIFIED BY 'wgldjcpassword';
Query OK, 0 rows affected (0.01 sec)
mysql>
mysql>
mysql> exit登录数据库wgldjc时报错：
[root@zabbix ~]# mysql -uwgldjc -pwgldjcpassword
ERROR 1045 (28000): Access denied for user 'wgldjc'@'localhost' (using password: YES)刷新一下权限，发现还是不行：
[root@zabbix ~]# mysql -uroot -proot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.5.16-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, 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> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> exit
Bye
[root@zabbix ~]# mysql -uwgldjc -pwgldjcpassword
ERROR 1045 (28000): Access denied for user 'wgldjc'@'localhost' (using password: YES)
[root@zabbix ~]# 在网上找到了一种方法，登录数据库mysql，删除user表中user列为空格的行：
[root@zabbix ~]# mysql -uroot -proot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 5.5.16-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, 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> use mysql
Database changed
mysql> select host,user,password from user;
+-----------+--------+-------------------------------------------+
| host | user | password |
+-----------+--------+-------------------------------------------+
| localhost | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| zabbix | root | |
| 127.0.0.1 | root | |
| ::1 | root | |
| localhost | | |
| zabbix | | |
| % | wgldjc | *70E31422FB5C781D112D6C944FAB09312088255B |
+-----------+--------+-------------------------------------------+
7 rows in set (0.00 sec)
mysql> delete from user where user=' ';
Query OK, 2 rows affected (0.00 sec)
mysql> exit
Bye下面再进行尝试登录数据库wgldjc，依然报错：
[root@zabbix ~]# mysql -uwgldjc -pwgldjcpassword
ERROR 1045 (28000): Access denied for user 'wgldjc'@'localhost' (using password: YES)刷新权限
[root@zabbix ~]# mysql -uroot -proot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 11
Server version: 5.5.16-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, 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> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> exit
Bye成功登录：
[root@zabbix ~]# mysql -uwgldjc -pwgldjcpassword
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 12
Server version: 5.5.16-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, 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> exit
Bye
[root@zabbix ~]# 再次创建数据库后登录不再报此错：
[root@zabbix ~]# mysql -u root -p root
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 15
Server version: 5.5.16-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, 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> create database tjp;
Query OK, 1 row affected (0.00 sec)
mysql> GRANT ALL PRIVILEGES ON tjp.* TO tjp@'%' IDENTIFIED BY 'tjp';
Query OK, 0 rows affected (0.00 sec)
mysql> exit
Bye
[root@zabbix ~]# mysql -utjp -ptjp
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 16
Server version: 5.5.16-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, 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> 注：为了使博客更加完善，便于更好的分享，请读者为文章中的错误进行指正，博主会定期更正，谢谢！