MySQL创建新用户以及权限授予

1.通过mysql数据库的user表查看用户相关信息

mysql> use mysql;
mysql> select host,user from user;

查看用户相关信息

2.创建数据库

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

3.创建新用户

mysql> create user 'userName'@'%' identified by 'passwr';

语法：

CREATE USER 'username'@'host' IDENTIFIED BY 'password';

例子:

　　CREATE USER 'dog'@'localhost' IDENTIFIED BY '123456';
　　CREATE USER 'pig'@'192.168.1.101_' IDENDIFIED BY '123456';
　　CREATE USER 'pig'@'%' IDENTIFIED BY '123456';
　　CREATE USER 'pig'@'%' IDENTIFIED BY '';
　　CREATE USER 'pig'@'%';

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userName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 'userName';
flush privileges;

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.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 'userName';
Query OK, 0 rows affected (0.00 sec)
mysql> show grants for 'userName';

+----------------------------------------------------------------------------------------------------+
| Grants for 'userName'@% |
+----------------------------------------------------------------------------------------------------+
| GRANT USAGE ON . TO 'userName'@'%' IDENTIFIED BY PASSWORD '*****************************************' |
| GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP ON [databasename].* TO 'userName'@'%' |

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

6.通过revoke命令移除用户的相关权限

mysql> revoke drop on [databasename].* from 'userName';
mysql> show grants for 'userName';

+----------------------------------------------------------------------------------------------------+
| Grants for 'userName'@% |
+----------------------------------------------------------------------------------------------------+
| GRANT USAGE ON . TO 'userName'@'%' IDENTIFIED BY PASSWORD '*****************************************' |
| GRANT SELECT, INSERT, UPDATE, DELETE, CREATE ON [databasename].* TO 'userName'@'%' |
+----------------------------------------------------------------------------------------------------+

7.修改用户密码

mysql>update mysql.user set password=password('新密码') where User="demo" and Host="localhost";
  　　mysql>flush privileges;

8.删除用户

mysql>Delete FROM user Where User='demo' and Host='localhost';
mysql>flush privileges;
mysql>drop database demoDB; //删除用户的数据库
删除账户及权限：>drop user 用户名@'%';
　　　　　　　　>drop user 用户名@ localhost; 

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参考

MySQL创建数据库和创建用户以及授权
mysql授予用户新建数据库的权限