mysql create user

 1 -- 查看系统用户
 2 select Host,User,Password from mysql.user;
 3 
 4 -- 创建一个远程用户 
 5 create user test identified by '123456'; 
 6 
 7 -- 分配权限 
 8 grant all privileges on *.* to 'test'@'%'identified by '123456' with grant option; 
 9 
10 -- 刷新mysql用户权限
11 flush privileges ; 
12 
13 -- 修改指定用户密码 
14 update mysql.user set password=password('新密码') where User="test" and Host="localhost"; 
15 
16 -- 删除用户 
17 delete from user where User='test' and Host='localhost';

-- 查看mysql支持字符集
show variables like "% character %";

-- 建立数据库并指定编码
create database app_relation character set utf8; 

-- 修改数据库编码
alter database app_relation character set utf8;

CREATE DATABASE db_name DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

CREATE DATABASE 的语法：
CREATE {DATABASE | SCHEMA} [IF NOT EXISTS] db_name
[create_specification [, create_specification] ...]
create_specification:
[DEFAULT] CHARACTER SET charset_name
| [DEFAULT] COLLATE collation_name

更改数据库的字符编码
ALTER DATABASE db_name DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci