1.通过mysql数据库的user表查看用户相关信息

mysql> use mysql

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

mysql> select host,user,password from user;

+-----------+------+-------------------------------------------+

| host | user | password |

+-----------+------+-------------------------------------------+

| localhost | root | *87F2746835A04895BB77E12AA5054A767******* |

| qxyw | root | |

| 127.0.0.1 | root | |

| localhost | | |

| qxyw | | |

+-----------+------+-------------------------------------------+

5 rows in set (0.00 sec)

2.创建数据库

mysql> create database [databasename] default character set utf8 collate utf8_general_ci;

Query OK, 1 row affected (0.00 sec)

3.创建用户

mysql> create user 'dba'@'%' identified by '*******';

Query OK, 0 rows affected (0.00 sec)

user表中host列的值的意义

%               匹配所有主机

localhost    localhost不会被解析成IP地址，直接通过UNIXsocket连接

127.0.0.1   会通过TCP/IP协议连接，并且只能在本机访问；

::1              ::1就是兼容支持ipv6的，表示同ipv4的127.0.0.1

4.对dba用户给予针对指定数据库进行增删改查的权限

mysql> grant select,insert,update,delete,create on [databasename].* to dba;

Query OK, 0 rows affected (0.00 sec)

注意：修改完权限以后 一定要刷新服务，或者重启服务，刷新服务用：FLUSH PRIVILEGES

5.可以通过show grants命令查看权限，若想要在原来的基础上增加权限则继续执行grant

mysql> grant drop on [databasename].* to dba;

Query OK, 0 rows affected (0.00 sec)

mysql> show grants for dba;

+----------------------------------------------------------------------------------------------------+

| Grants for dba@% |

+----------------------------------------------------------------------------------------------------+

| GRANT USAGE ON *.* TO 'dba'@'%' IDENTIFIED BY PASSWORD '*****************************************' |

| GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP ON `[databasename]`.* TO 'dba'@'%' |

+----------------------------------------------------------------------------------------------------+

2 rows in set (0.00 sec)

6.通过revoke命令可以移除用户的相关权限

mysql> revoke drop on [databasename].* from dba;

Query OK, 0 rows affected (0.00 sec)

mysql> show grants for dba;

+----------------------------------------------------------------------------------------------------+

| Grants for dba@% |

+----------------------------------------------------------------------------------------------------+

| GRANT USAGE ON *.* TO 'dba'@'%' IDENTIFIED BY PASSWORD '*****************************************' |

| GRANT SELECT, INSERT, UPDATE, DELETE, CREATE ON `[databasename]`.* TO 'dba'@'%' |

+----------------------------------------------------------------------------------------------------+

2 rows in set (0.00 sec)