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1.MariaDB数据库创建用户
1.1 命令
CREATE USER 'username'@'host' IDENTIFIED BY 'password';
1.2 参数
username:(jack) 创建的用户名 host:(192.168.13.34) 指定该用户在哪个主机上可以登陆,
如果是本地用户可用localhost, 如果想让该用户可以从任意远程主机登陆,可以使用通配符% password:(jack)
建议用户名和密码不要一致,上述只是为了演示 该用户的登陆密码,密码可以为空, 如果为空则该用户可以不需要密码登陆服务器.
1.3 示例
# 创建用户‘Ann’ MariaDB [(none)]> create user ann@localhost identified by 'ann' #
创建用户‘Steven’ MariaDB [(none)]> create user ann@localhost identified by 'ann' #
创建用户‘Jack’ MariaDB [mysql]> create user jack@'192.168.13.34' identified by
'jack';
2.MariaDB数据库给用户授权
2.1 命令
GRANT privileges ON databasename.tablename TO 'username'@'host'
2.2 参数
privileges: 用户的操作权限,如SELECT,INSERT,UPDATE等,如果要授予所的权限则使用ALL. databasename: 数据库名
tablename: 表名,如果要授予该用户对所有数据库和表的相应操作权限则可用*表示,如*.*.
2.3 示例
# 授权Ann拥有db1数据库的所有权限,允许在localhost登录 MariaDB [(none)]> grant select on db1.* to
ann@localhost; MariaDB [mysql]> flush privileges; #
授权Jack拥有db1数据库的所有权限,允许在192.168.13.34登录 MariaDB [(none)]> grant all on db1.* to
jack@'192.168.13.34'; MariaDB [mysql]> flush privileges; #
授权Steven拥有db1数据库的所有权限,允许从任意远程主机登陆， # 注意你授权时用%,你创建用户时,必须也是%,要对应,否则报错. MariaDB
[(none)]> grant all on *.* to steven@'%'; MariaDB [mysql]> flush privileges;
3.MariaDB数据库创建用户并授权的命令
3.1 授权apollo用户拥有db1数据库的所有权限
MariaDB [mysql]> grant all on *.* to john@'192.168.13.34' identified by
'john'; MariaDB [mysql]> flush privileges;
3.2 授予外网登陆权限
MariaDB [mysql]> grant all privileges on *.* to username@'%' identified by
'password';
3.3 授予权限并且可以授权
MariaDB [mysql]>grant all privileges on *.* to username@'hostname' identified
by 'password' with grant option; # 整个命令是一句话,这里换行是因为显示问题.
授权部分参数值:
all privileges,all
select,insert,update,delete,create,drop,index,alter,grant,references,reload,shutdown,process,file
4.MariaDB数据库查看用户
4.1 MariaDB查看当前登录用户
# 方法1 MariaDB [(none)]> select user(); # 方法2 MariaDB [(none)]> select
current_user; # 方法3 MariaDB [(none)]> select current_user();
4.2 MariaDB中如何显示所有用户?
MariaDB [(none)]> select User,Host,Password from mysql.user;
4.3 MariaDB显示所有的用户(不重复)
MariaDB [mysql]> select distinct user from mysql.user;
5.MariaDB数据库删除用户
# 5.1 删除用户'jack' MariaDB [mysql]> delete from user where user='jack'; # 5.2
删除用户'steven' MariaDB [(none)]> delete from mysql.user where user='steven' and
host='%'; # 5.3 删除用户'john' MariaDB [(none)]> drop user 'john'@'192.168.13.34';
6.MariaDB数据库撤销用户权限
6.1 命令
REVOKE privileges ON databasename.tablename FROM 'username'@'host';
6.2参数
privileges: 用户的操作权限,如SELECT,INSERT,UPDATE等,如果要授予所的权限则使用ALL. databasename: 数据库名
tablename: 表名,如果要授予该用户对所有数据库和表的相应操作权限则可用*表示,如*.*.
6.3 示例
# 假如你在给用户授权的时候是这样的： grant select on db1.user to jack@'%'; # 执行下面sql语句 revoke
select on *.* from jack@'%'; # 并不能撤销该用户对db1数据库中user表的SELECT操作. #
假如你在给用户授权的时候是这样的： grant select on *.* to jack@'%'; # 执行下面sql语句 revoke select on
db1.user from jack@'%'; # 并不能撤销该用户对db1数据库中user表的SELECT操作.
6.4 查看授权信息
MariaDB [(none)]> show grants for 'jack'@'192.168.13.34';
6.5 撤销用户Jack所有权限
revoke ALL PRIVILEGES ON `db1`.* from 'jack'@'192.168.13.34'