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  • MySQL的root用户设置密码

    mysql>set password =password('你的密码');
    mysql>flush privileges;
    2.使用GRANT语句 
    mysql>grant all on *.* to 'root'@'localhost' IDENTIFIED BY '你的密码'with grant option ;
    mysql>flush privileges;
    
    3.进入mysql库修改user表
    mysql>use mysql;
    mysql>update user set password=password('你的密码') where user='root'; 
    mysql>flush privileges;

    MySQL在刚刚被安装的时候,它的root用户是没有被设置密码的。首先来设置MySQL的root密码。

    [root@sample ~]# mysql -u root  ← 用root用户登录MySQL服务器

    Welcome to the MySQL monitor. Commands end with ; or \g.
    Your MySQL connection id is 2 to server version: 4.1.20

    Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

    mysql> select user,host,password from mysql.user;  ← 查看用户信息
    +------+------------------------------+---------------+
    | user | host          | password |
    +------+------------------------------+---------------+
    | root | localhost        |       |  ← root密码为空 
    | root | sample.centospub.com  |       |  ← root密码为空
    |   | sample.centospub.com |       |
    |   | localhost       |       |
    |root | %                                 |XXX      |
    |   |                            |       |
    +------+------------------------------+---------------+

    4 rows in set (0.00 sec)

    mysql> set password for root@localhost=password('在这里填入root密码');  ← 设置root密码
    Query OK, 0 rows affected (0.01 sec)

    mysql> set password for root@'sample.centospub.com'=password('在这里填入root密码');  ← 设置root密码
    Query OK, 0 rows affected (0.01 sec)只有设置了这个才可以,才可以通过数据库来安装网址


    mysql> set password for root@'xxx'=password('xxx');  ← 设置root密码
    Query OK, 0 rows affected (0.01 sec)

    set password for root@localhost=password("password");  mysql 5.1版本中

    运行完上面任何一个语句后再用
    flush privileges;
    才会起作用,不要忘了。 

    mysql> select user,host,password from mysql.user;  ← 查看用户信息
    +------+--------------------------------+--------------------------+
    | user | host          | password     |
    +------+--------------------------------+--------------------------+
    | root | localhost        | 19b68057189b027f |  ← root密码被设置
    | root | sample.centospub.com   | 19b68057189b027f |  ← root密码被设置
    |    | sample.centospub.com   |          |
    |    | localhost        |          |
    +------+--------------------------------+--------------------------+
    4 rows in set (0.01 sec)

    mysql> exit  ← 退出MySQL服务器
    Bye

    然后,测试一下root密码有没有生效。

    [root@sample ~]# mysql -u root  ← 通过空密码用root登录

    ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)  ← 出现此错误信息说明密码设置成功

    [root@localhost ~]# mysql -u root -h sample.centospub.com  ← 通过空密码用root登录

    ERROR 1045 (28000): Access denied for user 'root'@'localhost'  (using password: NO)  ← 出现此错误信息说明密码设置成功

    [root@sample ~]#mysql -u root -p  ← 通过密码用root登录
    Enter password:  ← 在这里输入密码

    Welcome to the MySQL monitor. Commands end with ; or \g.  ← 确认用密码能够成功登录
    Your MySQL connection id is 5 to server version: 4.1.20

    Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

    mysql> exit
    Bye

    [root@sample ~]# mysql -u root -h sample.centospub.com -p  ← 通过密码用root登录
    Enter password:  ← 在这里输入密码

    Welcome to the MySQL monitor. Commands end with ; or \g.  ← 确认用密码能够成功登录
    Your MySQL connection id is 6 to server version: 4.1.20

    Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

    mysql> exit  ← 退出MySQL服务器
    Bye

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  • 原文地址:https://www.cnblogs.com/panzulong/p/2548946.html
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