Linux服務器---使用mysql

發布時間：2020-08-11 01:49:48 來源：ITPUB博客閱讀：127 作者：一生有你llx 欄目：建站服務器

使用mysql

1 、登錄，可以用密碼登錄，也可以不用密碼登錄。命令格式“mysql –u 用戶名 –p 密碼”

[root@localhost src]# mysql -u root – p // 有密碼登錄

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 3

[root@localhost src]# mysql -u root // 無密碼登錄

2 、退出，命令“quit”

[root@localhost bin]# quit

3 、創建數據庫，命令“create database 數據庫名稱;”，注意這個命令后面有分號

mysql> create database test1;

Query OK, 1 row affected (0.00 sec)

4 、查看數據庫，命令“show databases;”

mysql> show databases;

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

| Database |

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

| information_schema |

| mysql |

| test |

| test1 |

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

4 rows in set (0.00 sec)

5 、刪除數據庫，命令“drop database 數據庫名稱;”

mysql> drop database test1;

Query OK, 0 rows affected (0.01 sec)

6 、設置權限

mysql 允許給某個特定的用戶賦予指定的權利，而且可以指定在某臺機器上使用。Mysql的權限如下

權限	數據庫	Table	Column	說明
all privileges	√			所有權利
alter	√	√		增減、刪除、修改列
create	√	√		創建數據庫、表
delete	√	√		刪除行
drop	√	√		刪除表、數據庫
file	√			操作文件
index	√	√		索引
insert	√	√	√	插入
process	√			查看線程、連接
reference	√			創建外鍵
reload	√			重新加載，擁有此權限可以刷新表
select	√	√	√	選擇
shutdown	√			關閉
update	√	√	√	更新
usage	√			無權限，只能連接

1 ）授權用戶權限，命令格式“grant 權限on 數據庫文件to 用戶名@ip identified by ‘密碼’;”。在使用grant的時候，如果用戶不存在，那么久創建用戶。

// 給 david 在本機授權插入功能，密碼 123456 ，只能對 test01 操作

mysql> grant insert on test01.* to david@localhost identified by '123456';

Query OK, 0 rows affected (0.00 sec)

mysql>

// 給 david 所有權限，在所有的主機都可以操作，而且可以操作任意數據庫

mysql> grant all privileges on *.* to david@'%' identified by '123456';

Query OK, 0 rows affected (0.00 sec)

mysql>

2 ）查看當前數據庫所有授權情況，命令“select host，user from mysql.user”

mysql> select host,user from mysql.user;

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

| host | user |

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

| % | david |

| 127.0.0.1 | root |

| localhost | |

| localhost | david |

| localhost | root |

| localhost.localdomain | |

| localhost.localdomain | root |

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

7 rows in set (0.00 sec)

mysql>

3 ）查看當前登錄用戶的權利，命令“show grants”

mysql> show grants;

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

| Grants for root@localhost |

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

| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '*1256939B1977AFF6C3D114C5594EE354EF363A8B' WITH GRANT OPTION |

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

1 row in set (0.00 sec)

mysql>

4 ）查看某個用戶在某臺機器的權限，命令“show grants for user@ip”

mysql> show grants for david@localhost;

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

| Grants for david@localhost |

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

| GRANT USAGE ON *.* TO 'david'@'localhost' IDENTIFIED BY PASSWORD '*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9' |

| GRANT INSERT ON `test01`.* TO 'david'@'localhost' |

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

2 rows in set (0.00 sec)

mysql>

5 ）刪除用戶的權限，命令“revoke 權限on 數據庫文件 from user@ip”

mysql> revoke all privileges on *.* from david@'%';

Query OK, 0 rows affected (0.00 sec)

mysql> show grants for david@localhost; // 刪除之后查看一下

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

| Grants for david@localhost |

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

| GRANT USAGE ON *.* TO 'david'@'localhost' IDENTIFIED BY PASSWORD '*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9' |

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

2 rows in set (0.00 sec)

mysql>

6 ）刪除用戶，命令“delete from user where user=‘username’”

mysql> use mysql; // 首先要調用這個命令

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> delete from user where user='david'; // 刪除用戶

Query OK, 2 rows affected (0.00 sec)

mysql> select host,user from mysql.user; // 查看用戶

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

| host | user |

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

| 127.0.0.1 | root |

| localhost | |

| localhost | root |

| localhost.localdomain | |

| localhost.localdomain | root |

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

5 rows in set (0.00 sec)

mysql>

做了一個Linux學習的平臺，目前出來一個雛形，各位可以參考使用
鏈接: https://pan.baidu.com/s/1GOLVU2CbpBNGtunztVpaCQ 密碼:n7bk

Linux服務器---使用mysql

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