mysql用户与授权
2024-09-08 09:31:16
视图
create view 视图名 as 查询语句;
MariaDB [hellodb]> create view view_left as select name from students;
Query OK, rows affected (0.00 sec)
MariaDB [hellodb]> create view view_students as select stuid,name from students;Query OK, rows affected (0.00 sec)
MariaDB [hellodb]> select * from view_students;
+-------+---------------+
| stuid | name |
+-------+---------------+
| | Shi Zhongyu |
| | Shi Potian |
| | Xie Yanke |
| | Ding Dian |
| | Yu Yutong |
| | Shi Qing |
| | Xi Ren |
| | Lin Daiyu |
| | Ren Yingying |
| | Yue Lingshan |
| | Yuan Chengzhi |
| | Wen Qingqing |
| | Tian Boguang |
| | Lu Wushuang |
| | Duan Yu |
| | Xu Zhu |
| | Lin Chong |
| | Hua Rong |
| | Xue Baochai |
| | Diao Chan |
| | Huang Yueying |
| | Xiao Qiao |
| | Ma Chao |
| | Xu Xian |
| | Sun Dasheng |
+-------+---------------+
rows in set (0.00 sec)
用户管理
1、用户账号
用户的账号由用户名和HOST俩部分组成('USERNAME'@'HOST')
HOST的表示:
主机名
- 具体IP地址
网段/掩码
可以使用通配符表示,%和_;192.168.%即表示这个网段的所有主机
2、增加删除账号
主要:在数据库中修改了用户信息需要执行
FLUSH PRIVILEGES;
来刷新授权表使其生效
- 创建
create user '用户名'@'主机名' identified by '密码';
MariaDB [mysql]> CREATE USER 'user1'@'192.168.%';
MariaDB [mysql]> CREATE USER 'user2'@'192.168.%' IDENTIFIED BY 'your_password';
MariaDB [mysql]> SELECT user,host,password FROM user;
+-------+-----------+-------------------------------------------+
| user | host | password |
+-------+-----------+-------------------------------------------+
| root | localhost | *4A54C3F37C03C7FBACE31591D6A8C546F93DF5C5 |
| root | centos7 | |
| root | 127.0.0.1 | |
| root | :: | |
| | localhost | |
| | centos7 | |
| user1 | 192.168.% | |
| user2 | 192.168.% | *9E72259BA9214F692A85B240647C4D95B0F2E08B |
+-------+-----------+-------------------------------------------+
- 删除
drop user '用户名'@'主机名';
MariaDB [mysql]> DROP USER user2@'192.168.%';
MariaDB [mysql]> SELECT user,host,password FROM user;
+-------+-----------+-------------------------------------------+
| user | host | password |
+-------+-----------+-------------------------------------------+
| root | localhost | *4A54C3F37C03C7FBACE31591D6A8C546F93DF5C5 |
| root | centos7 | |
| root | 127.0.0.1 | |
| root | :: | |
| | localhost | |
| | centos7 | |
| user1 | 192.168.% | |
+-------+-----------+-------------------------------------------+
- 重命名
MariaDB [mysql]> RENAME USER user1@'192.168.%' TO testuser@'%';
MariaDB [mysql]> SELECT user,host,password FROM mysql.user;
+----------+-----------+-------------------------------------------+
| user | host | password |
+----------+-----------+-------------------------------------------+
| root | localhost | *4A54C3F37C03C7FBACE31591D6A8C546F93DF5C5 |
| root | centos7 | |
| root | 127.0.0.1 | |
| root | :: | |
| | localhost | |
| | centos7 | |
| testuser | % | |
+----------+-----------+-------------------------------------------+
修改密码
MariaDB [mysql]> SET PASSWORD FOR testuser@'%' =PASSWORD('testpass');
MariaDB [mysql]> SELECT user,host,password FROM mysql.user;
+----------+-----------+-------------------------------------------+
| user | host | password |
+----------+-----------+-------------------------------------------+
| root | localhost | *4A54C3F37C03C7FBACE31591D6A8C546F93DF5C5 |
| root | centos7 | |
| root | 127.0.0.1 | |
| root | :: | |
| | localhost | |
| | centos7 | |
| testuser | % | *00E247AC5F9AF26AE0194B41E1E769DEE1429A29 |
+----------+-----------+-------------------------------------------+
其他修改密码的方法:
UPDATE user SET password=PASSWORD('testpass') WHERE user='testuser';
# mysqladmin -uroot -poldpass password 'newpass'
3、破解管理账号密码
- 空数据库的情况下恢复密码
# systemctl stop mariadb
# rm -rf /var/lib/mysql/* #删库跑路
# systemctl start mariadb
- 有数据的情况下恢复密码
)在/etc/my.cnf配置文件的[mydqld]下添加skip-grant-tables和skip-networking参数
)# systemctl restart mariadb 重启服务
)执行mysql登录到数据库
)MariaDB [(none)]> UPDATE mysql.user SET password=PASSWORD('newpassword') WHERE user='root' AND host='localhost'; #更新密码
)MariaDB [(none)]> FLUSH PRIVILEGES; #刷新授权表
)退出,修改配置文件,删除skip-grant-tables和skip-networking参数,重启服务
也可以在启动mysqld进程时,为其使用如下选项:
--skip-grant-tables
--skip-networking
授权管理
1、授权
grant all on 库名.标名(*表示所有) to 用户名@'主机名(%所有)' identified by '密码';
授权时如果用户不存在则创建,所以我们一般不会单独去创建一个用户,而是授权创建一块完成。
- priv_type 授权类型
SELECT
INSERT
UPDATE
DELETE
CREATE
DROP
INDEX
ALTER
SHOW DATABASES
CREATE TEMPORARY TABLES
LOCK TABLES
CREATE VIEW
SHOW VIEW
CREATE USER
ALL PRIVILEGES 或 ALL - object_type 授权对象
TABLE
FUNCTION
PROCEDURE - priv_level 授权级别
*或*.* 表示所有库
db_name.* 表示指定库中的所有表
db_name.tbl_name 指定库中的指定表
tbl_name 表示当前库的表
db_name.routine_name 表示指定库的函数,存储过程,触发器 - WITH GRANT OPTION
MAX_QUERIES_PER_HOUR count
MAX_UPDATES_PER_HOUR count
MAX_CONNECTIONS_PER_HOUR count
MAX_USER_CONNECTIONS count
MariaDB [school]> GRANT SELECT(stuid,name) ON TABLE school.students TO admin@'%' IDENTIFIED BY 'admin'; #把students表的stuid和name字段的查询权限授权于admin@'%'用户
MariaDB [school]> FLUSH PRIVILEGES; #刷新授权表
2、查询授权
MariaDB [school]> SHOW GRANTS FOR admin@'%'\G #查看指定用户的权限
*************************** . row ***************************
Grants for admin@%: GRANT USAGE ON *.* TO 'admin'@'%' IDENTIFIED BY PASSWORD '*4ACFE3202A5FF5CF467898FC58AAB1D615029441'
*************************** . row ***************************
Grants for admin@%: GRANT SELECT (stuid, name) ON `school`.`students` TO 'admin'@'%'
[root@working ~]# mysql -uadmin -padmin -h192.168.0.
MariaDB [(none)]> SHOW GRANTS FOR CURRENT_USER()\G #查询自己的权限
*************************** . row ***************************
Grants for admin@%: GRANT USAGE ON *.* TO 'admin'@'%' IDENTIFIED BY PASSWORD '*4ACFE3202A5FF5CF467898FC58AAB1D615029441'
*************************** . row ***************************
Grants for admin@%: GRANT SELECT (stuid, name) ON `school`.`students` TO 'admin'@'%'
3、收回授权
MariaDB [school]> REVOKE SELECT(stuid) ON school.students FROM admin@'%'; #收回admin@'%'用户对stuid字段的查询权限
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