root和普通用户
权限机制
mysql系统数据库
show databases;
use mysql;
show tables;
+---------------------------+
| Tables_in_mysql |
+---------------------------+
| columns_priv |
| db |
| func |
| help_category |
| help_keyword |
| help_relation |
| help_topic |
| host |
| proc |
| procs_priv |
| tables_priv |
| time_zone |
| time_zone_leap_second |
| time_zone_name |
| time_zone_transition |
| time_zone_transition_type |
| user |
+---------------------------+
mysql.user
+-----------------------+-----------------------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------------+-----------------------------------+------+-----+---------+-------+
| Host | char(60) | NO | PRI | | |
| User | char(16) | NO | PRI | | |
| Password | char(41) | NO | | | |
| Select_priv | enum('N','Y') | NO | | N | |
| Insert_priv | enum('N','Y') | NO | | N | |
| Update_priv | enum('N','Y') | NO | | N | |
| Delete_priv | enum('N','Y') | NO | | N | |
| Create_priv | enum('N','Y') | NO | | N | |
| Drop_priv | enum('N','Y') | NO | | N | |
| Reload_priv | enum('N','Y') | NO | | N | |重新加载权限表
| Shutdown_priv | enum('N','Y') | NO | | N | |
| Process_priv | enum('N','Y') | NO | | N | |服务器管理
| File_priv | enum('N','Y') | NO | | N | |
| Grant_priv | enum('N','Y') | NO | | N | |Grand Option 数据库，表，存储进程函数
| References_priv | enum('N','Y') | NO | | N | |
| Index_priv | enum('N','Y') | NO | | N | |
| Alter_priv | enum('N','Y') | NO | | N | |
| Show_db_priv | enum('N','Y') | NO | | N | |
| Super_priv | enum('N','Y') | NO | | N | |
| Create_tmp_table_priv | enum('N','Y') | NO | | N | |
| Lock_tables_priv | enum('N','Y') | NO | | N | |
| Execute_priv | enum('N','Y') | NO | | N | |
| Repl_slave_priv | enum('N','Y') | NO | | N | |
| Repl_client_priv | enum('N','Y') | NO | | N | |
| Create_view_priv | enum('N','Y') | NO | | N | |
| Show_view_priv | enum('N','Y') | NO | | N | |
| Create_routine_priv | enum('N','Y') | NO | | N | |
| Alter_routine_priv | enum('N','Y') | NO | | N | |
| Create_user_priv | enum('N','Y') | NO | | N | |
| ssl_type | enum('','ANY','X509','SPECIFIED') | NO | | | |
| ssl_cipher | blob | NO | | NULL | |
| x509_issuer | blob | NO | | NULL | |
| x509_subject | blob | NO | | NULL | |
| max_questions | int(11) unsigned | NO | | 0 | |
| max_updates | int(11) unsigned | NO | | 0 | |
| max_connections | int(11) unsigned | NO | | 0 | |
| max_user_connections | int(11) unsigned | NO | | 0 | |
+-----------------------+-----------------------------------+------+-----+---------+-------+
Host 主机名
User 用户名
Password
上述3个字段都验证成功，才允许用户登录
权限字段，以_priv结尾的字段，决定了用户权限
高级权限
对用数据库进行管理
普通权限
对数据库操作
安全字段
ssl*~x509_su*，主要用来实现加密
mysql通常不支持ssl标准
show variables like 'have_openssl'
上句可以用来查询是不是支持ssl
+---------------+----------+
| Variable_name | Value |
+---------------+----------+
| have_openssl | DISABLED |
+---------------+----------+
mysql.db
+-----------------------+---------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------------+---------------+------+-----+---------+-------+
| Host | char(60) | NO | PRI | | |
| Db | char(64) | NO | PRI | | |
| User | char(16) | NO | PRI | | |
| Select_priv | enum('N','Y') | NO | | N | |
| Insert_priv | enum('N','Y') | NO | | N | |
| Update_priv | enum('N','Y') | NO | | N | |
| Delete_priv | enum('N','Y') | NO | | N | |
| Create_priv | enum('N','Y') | NO | | N | |
| Drop_priv | enum('N','Y') | NO | | N | |
| Grant_priv | enum('N','Y') | NO | | N | |
| References_priv | enum('N','Y') | NO | | N | |
| Index_priv | enum('N','Y') | NO | | N | |
| Alter_priv | enum('N','Y') | NO | | N | |
| Create_tmp_table_priv | enum('N','Y') | NO | | N | |
| Lock_tables_priv | enum('N','Y') | NO | | N | |
| Create_view_priv | enum('N','Y') | NO | | N | |
| Show_view_priv | enum('N','Y') | NO | | N | |
| Create_routine_priv | enum('N','Y') | NO | | N | |
| Alter_routine_priv | enum('N','Y') | NO | | N | |
| Execute_priv | enum('N','Y') | NO | | N | |
+-----------------------+---------------+------+-----+---------+-------+
用户字段
Host，User，Db
权限字段
形如*_priv
mysql.host
+-----------------------+---------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------------+---------------+------+-----+---------+-------+
| Host | char(60) | NO | PRI | | |
| Db | char(64) | NO | PRI | | |
| Select_priv | enum('N','Y') | NO | | N | |
| Insert_priv | enum('N','Y') | NO | | N | |
| Update_priv | enum('N','Y') | NO | | N | |
| Delete_priv | enum('N','Y') | NO | | N | |
| Create_priv | enum('N','Y') | NO | | N | |
| Drop_priv | enum('N','Y') | NO | | N | |
| Grant_priv | enum('N','Y') | NO | | N | |
| References_priv | enum('N','Y') | NO | | N | |
| Index_priv | enum('N','Y') | NO | | N | |
| Alter_priv | enum('N','Y') | NO | | N | |
| Create_tmp_table_priv | enum('N','Y') | NO | | N | |
| Lock_tables_priv | enum('N','Y') | NO | | N | |
| Create_view_priv | enum('N','Y') | NO | | N | |
| Show_view_priv | enum('N','Y') | NO | | N | |
| Create_routine_priv | enum('N','Y') | NO | | N | |
| Alter_routine_priv | enum('N','Y') | NO | | N | |
| Execute_priv | enum('N','Y') | NO | | N | |
+-----------------------+---------------+------+-----+---------+-------+
用户字段
Host,Db
权限字段
其他权限表
tables_priv
对单表进行权限设置
*************************** 1. row ***************************
Field: Host
Type: char(60)
Null: NO
Key: PRI
Default:
Extra:
*************************** 2. row ***************************
Field: Db
Type: char(64)
Null: NO
Key: PRI
Default:
Extra:
*************************** 3. row ***************************
Field: User
Type: char(16)
Null: NO
Key: PRI
Default:
Extra:
*************************** 4. row ***************************
Field: Table_name
Type: char(64)
Null: NO
Key: PRI
Default:
Extra:
*************************** 5. row ***************************
Field: Grantor
Type: char(77)
Null: NO
Key: MUL
Default:
Extra:
*************************** 6. row ***************************
Field: Timestamp
Type: timestamp
Null: NO
Key:
Default: CURRENT_TIMESTAMP
Extra:
*************************** 7. row ***************************
Field: Table_priv
Type: set('Select','Insert','Update','Delete','Create','Drop','Grant','References','Index','Alter','Create View','Show view')
Null: NO
Key:
Default:
Extra:
*************************** 8. row ***************************
Field: Column_priv
Type: set('Select','Insert','Update','References')
Null: NO
Key:
Default:
Extra:
columns_priv
对单列进行权限设置
+-------------+----------------------------------------------+------+-----+-------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------------+----------------------------------------------+------+-----+-------------------+-------+
| Host | char(60) | NO | PRI | | |
| Db | char(64) | NO | PRI | | |
| User | char(16) | NO | PRI | | |
| Table_name | char(64) | NO | PRI | | |
| Column_name | char(64) | NO | PRI | | |
| Timestamp | timestamp | NO | | CURRENT_TIMESTAMP | |
| Column_priv | set('Select','Insert','Update','References') | NO | | | |
+-------------+----------------------------------------------+------+-----+-------------------+-------+
procs_priv
系统表
+--------------+----------------------------------------+------+-----+-------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------------+----------------------------------------+------+-----+-------------------+-------+
| Host | char(60) | NO | PRI | | |
| Db | char(64) | NO | PRI | | |
| User | char(16) | NO | PRI | | |
| Routine_name | char(64) | NO | PRI | | |
| Routine_type | enum('FUNCTION','PROCEDURE') | NO | PRI | NULL | |
| Grantor | char(77) | NO | MUL | | |
| Proc_priv | set('Execute','Alter Routine','Grant') | NO | | | |
| Timestamp | timestamp | NO | | CURRENT_TIMESTAMP | |
+--------------+----------------------------------------+------+-----+-------------------+-------+
用户机制
用户管理机制包括登陆退出mysql，创建用户，修改用户密码，删除用户，为用户赋予权限
1、登陆或退出mysql
mysql -h hostname|hostIP -p port -u username -pPassword DatabaseName -e "SQL语句"
登陆数据库服务器，如果直接接密码，则密码password直接写在-p以后，中间不能有空格
mysql -u root -p
登陆本地的数据库，则隐藏输入密码
exit|quit：退出数据库
2、创建普通用户
root用户的权限太大，应当严格杜绝使用root登陆mysql
（a）create user
create user username [identifield by [password] 'password']
[,username [identifield by [password] 'password']]
....
password关键字主要用来对密码进行加密
create user qionghua identified by '123456';
（b）insert
mysql.user存储了关于用户账户的信息
insert into user(host,user,password) values('hostname','username',password('password'));
在具体创建用户账户时，由于表user中字段ssl_cipher，x509_issuer,x509_subject没有默许值，所以还需要设置这些字段的值，对password字段，1定要使用函数PASSWORD()进行加密
创建用户成功后如果不能登陆，使用
flush privileges
刷新下权限
（c）grant
上述两种创建用户的方式不方便给用户赋予权限
grant priv_type on databasename.tablename
to username[identified by [password]'password']
[,username[identified by [password]'password']]
[,username[identified by [password]'password']]
....
2、修改用户密码
两种方式：通过超级权限用户root和通过普通用户
root用户密码修改
1、mysqladmin
修改root用户密码
mysqladmin -u username -p oldpassword "new_password"
2、set
登陆mysql服务器后，可以通过set命令修改root用户密码
set password=password('new password')
3、更改系统表mysql.user数据记录修改
update user set password=password('new_password')
where user='root' and host='localhost'
普通用户密码修改
1、仿照创建用户时的grant方式
grant priv_type on databasename.tablename
to username[identified by [password]'password']
2、set命令
通过root账号登陆mysql后使用set命令
set password for 'username'@'hostname'=password("newpassword")
通过普通账户登陆mysql后使用set命令修改自己的密码
set password=password("new_password")
3、更改系统表mysql.user
update user set password=password("password") where user='username' and host="localhost"
如果没有设置主机，则不需要匹配host="localhost"
3、删除普通用户账户
1、drop user
drop user user1[,usre2,...]
2、删除系统表mysql.user数据记录
delete from user where user="username" and host="hostname"
权限管理
授权权限
在进行授权操作之前，需要用户具有grant权限
grant priv_type[(column_list)] on databasename.tablename
to user [identified by [password] "password"]
[,user [identified by [password] "password"]]
...
[with with_option[with_option]....]
with_option的取值
grant option
max_queries_per_hour count
max_update_per_hour count
max_connections_per_hour count
max_user_connections count 单个用户可以同时具有count个连接
查看权限
1、查看系统表mysql.user的数据记录
grant select,update,create,drop on *.* to 'qionghua';
select * from mysql.user where user='qionghua'G
*************************** 1. row ***************************
Host: %
User: qionghua
Password: *00A51F3F48415C7D4E8908980D443C29C69B60C9
Select_priv: Y
Insert_priv: N
Update_priv: Y
Delete_priv: N
Create_priv: Y
Drop_priv: Y
........
后面为N的字段省略。
同这个查询，可以看出该用户所具有的权限
收回权限
revoke priv_type[(column_list)] on databasename.tablename
from user1 [identified by [password] "password"]
[,user2 [identified by [password] "password"]]
...
[with with_option[with_option]....]
收回全部权限
revoke all privilege,grant option
from user1 [identified by [password] "password"]
[,user2 [identified by [password] "password"]]
...
mysql> show grants for "qionghua"G
*************************** 1. row ***************************
Grants for qionghua@%: GRANT SELECT, UPDATE, CREATE, DROP ON *.* TO 'qionghua'@'%' IDENTIFIED BY PASSWORD '*6BB4837EB74
329105EE4568DDA7DC67ED2CA2AD9'
1 row in set (0.00 sec)
mysql> revoke select on *.* from "qionghua";
Query OK, 0 rows affected (0.00 sec)
mysql> show grants for "qionghua"G
*************************** 1. row ***************************
Grants for qionghua@%: GRANT UPDATE, CREATE, DROP ON *.* TO 'qionghua'@'%' IDENTIFIED BY PASSWORD '*6BB4837EB74329105EE
4568DDA7DC67ED2CA2AD9'
1 row in set (0.00 sec)
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