設置更改root密碼、連接mysql、mysql常用命令
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、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
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‘
忘記密碼後，怎麽更改？
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配置刪除後重啟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（由什麽字段組成）
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);
本文出自 “探索發現新事物” 博客，請務必保留此出處http://jacksoner.blog.51cto.com/5802843/1982740
設置更改root密碼、連接mysql、mysql常用命令