MySQL中的用户创建与权限管理

mysql> create user '用户名'@'被允许连接的主机名称或主机的IP地址' identified by '用户密码';
mysql> select user,host from mysql.user;

mysql> create user 'hhy'@'localhost' identified by '123';
/*或*/
mysql> create user 'hhy'@'127.0.0.1' identified by '123';

mysql> create user 'test'@'192.1668.44.110' identified by '123';

# yum install mysql -y
# mysql -h 192.168.44.110 -P 3306 -uharry -p
Enter password:123

create user 'jack'@'192.168.44.%' identified by '123'

create user 'root'@'%' identified by '123';

drop user 'hhy'@'localhost';

drop user 'jack'@'192.168.44.%';

mysql> create user 'harry'@'localhost' identified by '123';
mysql> create user 'harry'@'192.168.44.110' identified 

mysql> drop user 'harry'@'192.168.44.110';

mysql> delete from mysql.user where user='root' and host='%';
mysql> flush privileges;

mysql> rename user 旧用户信息 to 新用户信息;

mysql> rename user 'root'@'%' to 'root'@'10.1.1.%';

mysql> create user 'tom'@'localhost' identified by '123';
mysql> rename user 'tom'@'localhost' to 'hhy'@'localhost';

mysql> update mysql.user set user='hhy',host='localhost' where user='tom' and host='localhost';

mysql> flush privileges;

USAGE	无权限,只有登录数据库,只可以使用test或test_*数据库
ALL		所有权限
以下权限为指定权限
select/update/delete/super/replication slave/reload...
with grant option 选项表示允许把自己的权限授予其它用户或者从其他用户收回自己的权限

create database java;
use java;
create table tb_student(
	id mediumint not null auto_increment,
	name varchar(20),
	age tinyint unsigned default 0,
	gender enum('男','女'),
	address varchar(255),
	primary key(id)
) engine=innodb default charset=utf8;

insert into tb_student values (null,'刘备',33,'男','湖北省武汉市');
insert into tb_student values (null,'貂蝉',18,'女','湖南省长沙市');
insert into tb_student values (null,'关羽',32,'男','湖北省荆州市');
insert into tb_student values (null,'大乔',20,'女','河南省漯河市');
insert into tb_student values (null,'赵云',25,'男','河北省石家庄市');
insert into tb_student values (null,'小乔',18,'女','湖北省荆州市');

mysql> grant 权限1,权限2 on 库.表 to 用户@主机
mysql> grant 权限(列1,列2,...) on 库.表 to 用户@主机

mysql> grant select on java.* to 'hehanyu'@'192.168.44.%';

mysql> flush privileges;

mysql> grant update(age) on java.tb_student to 'hehanyu'@'192.168.44.%';

mysql> flush privileges;

create user 'root'@'%' identified by '123';
grant all on *.* to 'root'@'%';
flush privileges;

mysql> show grants;

mysql> show grants for '用户名称'@'授权的主机名称或IP地址';

mysql> grant all on *.* to 'amy'@'10.1.1.%' identified by '123' with grant option;
mysql> grant all on *.* to 'harry'@'10.1.1.%' identified by '123'; 

revoke 权限 on 库.表 from 用户;
查看hehanyu用户权限
mysql> show grants for 'hehanyu'@'192.168.44.%';
撤消指定的权限
mysql> revoke update on java.tb_student from 'tom'@'192.168.44.%';
撤消所有的权限
mysql> revoke select on java.* from 'tom'@'192.168.44.%';