設置更改root密碼

1、將mysql加入環境變量中

[root@centos7 ~]# grep mysql /etc/profile

export PATH=/usr/local/mysql/bin/:$PATH

2、直接登錄，無密碼

[root@centos7 ~]# mysql -uroot

3、方式一：設置密碼

[root@centos7 ~]# mysqladmin -uroot password '123456'

Warning: Using a password on the command line interface can be insecure.

You have new mail in /var/spool/mail/root

方式二：設置遠程密碼和本地密碼

遠程密碼：遠程主機登錄使用

本地密碼：只能本機登錄使用

mysql> set password for 'root'@'localhost'=password('root');? ? ?????????????????????????#本地密碼

Query OK, 0 rows affected (0.01 sec)

mysql> GRANT USAGE ON *.* TO 'root'@'%'? IDENTIFIED BY? '123456';???????????????#遠程密碼

Query OK, 0 rows affected (0.00 sec)

查看：

mysql> select Host,User from mysql.user;

備注：(直接輸入mysql就可以登錄)

vi /etc/my.cnf

[client]

port? ? ? ? ? ? = 3306

user=root

password=root

4、登錄

[root@centos7 ~]# mysql -uroot -p'123456' -h127.0.0.1 -P3306

-h：指定主機

-P：指定端口

5、更改密碼為1234

[root@centos7 ~]# mysqladmin -uroot -p'123456' password '1234'

忘記密碼后，怎么更改？

1、[root@centos7 ~]# vi /etc/my.cnf

[mysqld]

skip-grant#跳過授權登錄

2、重啟mysql服務

[root@centos7 ~]# /etc/init.d/mysqld restart

3、[root@centos7 ~]# mysql -uroot

mysql> use mysql;

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

mysql> update user set password=password('123456') where user='root'; #更改密碼

4、將skip-grant配置刪除后重啟mysql服務

/etc/init.d/mysqld restart

5、已更改密碼

連接mysql

1、[root@centos7 ~]# mysql -uroot -p123456 -h127.0.0.1 -P3306

2、通過socket連接

[root@centos7 ~]# mysql -uroot -p123456 -S/tmp/mysql.sock

mysql常用命令

1、顯示所有數據庫

show databases;

2、進入哪個數據庫

user db

3、顯示數據庫中所有的表

mysql> show tables;

4、顯示表結構(由什么字段組成)

desc user;

5、查詢

select host,user from user;

6、顯示建表語句過程

show create table user\G;

7、顯示哪個用戶登錄

select user();

8、顯示表有多少行

select count(*) from user ;

9、顯示變量

show variables;

10、查找

show variables like '%error%';

11、設置臨時變量

mysql> set global max_connect_errors = 1000;

Query OK, 0 rows affected (0.00 sec)

mysql> show variables like 'max_connect_errors';

+--------------------+-------+

| Variable_name? ? ? | Value |

+--------------------+-------+

| max_connect_errors | 1000? |

+--------------------+-------+

11、顯示mysql的進程隊列

mysql> show processlist;

+----+------+-----------+-------+---------+------+-------+------------------+

| Id | User | Host? ? ? | db? ? | Command | Time | State | Info? ? ? ? ? ? ?|

+----+------+-----------+-------+---------+------+-------+------------------+

|? 3 | root | localhost | mysql | Query? ?|? ? 0 | init? | show processlist |

+----+------+-----------+-------+---------+------+-------+------------------+

1 row in set (0.01 sec)

mysql> show full? processlist;??#完整情況

+----+------+-----------+-------+---------+------+-------+------------------------+

| Id | User | Host? ? ? | db? ? | Command | Time | State | Info? ? ? ? ? ? ? ? ? ?|

+----+------+-----------+-------+---------+------+-------+------------------------+

|? 3 | root | localhost | mysql | Query? ?|? ? 0 | init? | show full? processlist |

+----+------+-----------+-------+---------+------+-------+------------------------+

12、新建表，字段

mysql> create table tb(`id` int,`num` varchar(10));

Query OK, 0 rows affected (0.02 sec)

mysql> show tables

-> ;

+----------------+

| Tables_in_test |

+----------------+

| tb? ? ? ? ? ? ?|

+----------------+

1 row in set (0.00 sec)

mysql> show create table tb;

+-------+--------------------------------------------------------------------------------------------------------------------------+

| Table | Create Table? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?|

+-------+--------------------------------------------------------------------------------------------------------------------------+

| tb? ? | CREATE TABLE `tb` (

`id` int(11) DEFAULT NULL,

`num` varchar(10) DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

+-------+--------------------------------------------------------------------------------------------------------------------------+

mysql> desc tb;

+-------+-------------+------+-----+---------+-------+

| Field | Type? ? ? ? | Null | Key | Default | Extra |

+-------+-------------+------+-----+---------+-------+

| id? ? | int(11)? ? ?| YES? |? ? ?| NULL? ? |? ? ? ?|

| num? ?| varchar(10) | YES? |? ? ?| NULL? ? |? ? ? ?|

+-------+-------------+------+-----+---------+-------+

13、刪除庫及表

drop database test;

drop table tb;

14、插入數據

insert tb value(1,4);

本文轉自方向對了，就不怕路遠了！51CTO博客，原文鏈接：http://blog.51cto.com/jacksoner/1982740 ，如需轉載請自行聯系原作者

總結

以上是生活随笔為你收集整理的mysql 更改root密码及 主机_设置更改root密码（远程，本地）、连接mysql、mysql常用命令...的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。