1、查看有哪些用户
mysql> use mysql;
Database changed
mysql> select host,user,password from user;
+----------------------+---------------+-------------------------------------------+
| host | user | password |
+----------------------+---------------+-------------------------------------------+
| localhost | root | *22E093CD59043430C91B3F885A8149AC99F4CDA6 |
| hexindai-bj-dfgc-156 | root | *22E093CD59043430C91B3F885A8149AC99F4CDA6 |
| 127.0.0.1 | root | *22E093CD59043430C91B3F885A8149AC99F4CDA6 |
| ::1 | root | *22E093CD59043430C91B3F885A8149AC99F4CDA6 |
| 172.16.10.154 | slave | *22E093CD59043430C91B3F885A8149AC99F4CDA6 |
2、新增用户
grant [权限1,权限2,权限3,...] on *.* to ‘user'@'host' identified by '密码';
flush privileges;
说明：
l 常用权限: all,create,drop,insert,deete,update,select
l *.* 代表 数据库.表，*表示所有
l User 表示 用户名
l Host 表示 来源，一般为localhost,IP
举例：
mysql> grant insert,select on shanghai.login to 'liangliang'@'%' identified by 'liang';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
3、删除用户
Delete from user where user=’root’;
flush privileges;
说明：
l 通过用户表条件正常删除即可
l 删除后务必flush privileges 刷新权限表
4、新增权限
grant [权限1,权限2,权限3,...] on *.* to ‘user'@'host' identified by '密码'
flush privileges;
举例：
mysql> grant insert on shanghai.login to 'pipi'@'%' identified by 'root';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
5、收回权限
Revoke[权限1,权限2,权限3,...] on *.* fromuser@’192.168.1.%’;
flush privileges;
说明：
l 常用权限: all,create,drop,insert,deete,update,select
l *.* 代表 数据库.表，*表示所有
l User 表示 用户名
l 192.168.1.% %为通配符，表示该网段下的所有IP用户
l 注意: 关键词from
举例：
mysql> revoke insert on shanghai.login from 'pipi'@'%';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> insert into login values (3,'pippi','root');
ERROR 1142 (42000): INSERT command denied to user 'pipi'@'localhost' for table 'login'
6、登录密码更改
update user set password=password('111111') where user='liangliang';
flush privileges;