ALTER USER 'root'@'localhost' IDENTIFIED BY '2S_#%~aB4&2.23';

//只允许指定ip连接
create user 'efour'@'%' identified by '223@.WWR@lwb*&';
grant all privileges on *.* to 'efour'@'%' identified by '223@.WWR@lwb*&' WITH GRANT OPTION;


alter user 'efour'@'%' identified by '223@.WWR@lwb*&';

grant all privileges on meirong1.* to efour;

flush privileges;

//允许所有ip连接（用通配符%表示）223@.WWR@lwb*&
create user '新用户名'@'%' identified by '密码';
5、为新用户授权

//基本格式如下
grant all privileges on 数据库名.表名 to '新用户名'@'指定ip' identified by '新用户密码' ;
//示例
//允许访问所有数据库下的所有表
grant all privileges on *.* to '新用户名'@'指定ip' identified by '新用户密码' ;
//指定数据库下的指定表
grant all privileges on test.test to '新用户名'@'指定ip' identified by '新用户密码' ;
6、设置用户操作权限

//设置用户拥有所有权限也就是管理员
grant all privileges on *.* to '新用户名'@'指定ip' identified by '新用户密码' WITH GRANT OPTION;
//拥有查询权限
grant select on *.* to '新用户名'@'指定ip' identified by '新用户密码' WITH GRANT OPTION;
//其它操作权限说明,select查询 insert插入 delete删除 update修改
//设置用户拥有查询插入的权限
grant select,insert on *.* to '新用户名'@'指定ip' identified by '新用户密码' WITH GRANT OPTION;
//取消用户查询的查询权限
REVOKE select ON what FROM '新用户名';