[MySQL光速入门]030 用户和数据安全

建立用户(用户名区分大小写)

方法一(命令): 语法:

CREATE USER '用户名'@'主机ip地址' IDENTIFIED BY '密码';
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实例: 添加dog用户, 密码123456

CREATE USER 'dog'@'localhost' IDENTIFIED BY '123456';
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方法二(改表, 须要刷新权限): 语法:

insert into mysql.user(host,user,password) values("主机ip地址","用户名",password("密码"));
flush privileges; 
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实例: 添加cat用户, 密码123456

insert into mysql.user(host,user,password) values("localhost","cat",password("123456"));
flush privileges; 
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查看用户

SELECT HOST, USER, PASSWORD FROM mysql.USER;
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测试一下登陆

删除用户

方式一(改表, 须要刷新权限):

Delete FROM mysql.user Where User='用户名' and Host='主机ip地址';
flush privileges;
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删除用户cat

Delete FROM mysql.user Where User='cat' and Host='localhost';
flush privileges;
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方式二(命令):

DROP USER '用户名'@'主机ip地址';
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删除用户dog

DROP USER 'dog'@'localhost';
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修改用户名

建立一个用户叫Trident(海皇戟)

insert into mysql.user(host,user,password) values("localhost","Trident",password("123456"));
flush privileges; 
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方式一(改表, 须要刷新权限):

update mysql.user set user = '新名字' where user = '原来的名字';
flush privileges; 
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更名Aegis(宙斯盾)

update mysql.user set user = 'Aegis' where user = 'Trident';
flush privileges; 
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方式二(命令):

rename user '原来的用户名'@'主机ip地址' to '新名字'@'主机ip地址';
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再改回Trident(海皇戟)

rename user 'Aegis'@'localhost' to 'Trident'@'localhost';
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修改密码(知道密码)

方式一(命令):

set password for '用户名'@'主机ip地址' = password('新密码');
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把''海皇戟''用户的密码改为"root"

set password for 'Trident'@'localhost' = password('root');
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方式二(改表, 须要刷新权限):

UPDATE `mysql`.`user` SET `Password` = password('新密码') where user = '用户名' and host = 'localhost';
FLUSH PRIVILEGES;
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把'海皇戟'用户的密码再次改为"123456"

UPDATE `mysql`.`user` SET `Password` = password('123456') where user = 'Trident' and host = 'localhost';
FLUSH PRIVILEGES;
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快速跳转

• [MySQL光速入门]029 数据库管理和维护
• [MySQL光速入门]031 权限管理