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http://blog.csdn.net/hi_dyp/article/details/5556027
1、root用户登录到mysql数据库
/usr/local/mysql/bin/mysql -u root -p (输入密码进入mysql)
2、进入mysql，输入如下命令
use mysql;
3、查看user表的情况
SELECT Host,User FROM user;
//指明主机名称，“%”表示匹配所有字符串
4、 UPDATE user SET Host = ‘%’ WHERE User= ‘root’ LIMIT 1;
5、输入如下命令让刚才设置的命令生效
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
注意在mysql 命令行形式下一定要输入”;”
按照前面五个步骤完成之后，通过控制台输入
[root@linux ~]# mysql -h localhost -u root -p
Enter password:
ERROR 1045 (28000): Access denied for user ‘root’@’localhost’ (using password: YES)
不让这么连接数据库
原因：是因为host对应的user字段是空的，我们需要将其改为root即可
mysql> select host,user from user;
+———–+——+
| host | user |
+———–+——+
| % | root |
| 127.0.0.1 | root |
| linux | |
| linux | root |
| localhost | |
+———–+——+
5 rows in set (0.00 sec)
解决办法一：
mysql> update user set user=’root’ where host=’localhost’;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
解决办法二：
将localhost改为本机的IP地址，则能够识别了
[root@linux ~]# mysql -h 172.16.42.68 -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 157
Server version: 5.1.66 Source distribution
Copyright (c) 2000, 2012, 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.
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