[MySQL光速入門]030 用戶和數據安全

建立用戶(用戶名區分大小寫)

方法一(命令): 語法:

CREATE USER '用戶名'@'主機ip地址' IDENTIFIED BY '密碼';
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實例: 添加dog用戶, 密碼123456

CREATE USER 'dog'@'localhost' IDENTIFIED BY '123456';
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方法二(改表, 須要刷新權限): 語法:

insert into mysql.user(host,user,password) values("主機ip地址","用戶名",password("密碼"));
flush privileges; 
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實例: 添加cat用戶, 密碼123456

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

SELECT HOST, USER, PASSWORD FROM mysql.USER;
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測試一下登陸

刪除用戶

方式一(改表, 須要刷新權限):

Delete FROM mysql.user Where User='用戶名' and Host='主機ip地址';
flush privileges;
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刪除用戶cat

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

DROP USER '用戶名'@'主機ip地址';
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刪除用戶dog

DROP USER 'dog'@'localhost';
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修改用戶名

建立一個用戶叫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, 須要刷新權限):

update mysql.user set user = '新名字' where user = '原來的名字';
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 '原來的用戶名'@'主機ip地址' to '新名字'@'主機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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修改密碼(知道密碼)

方式一(命令):

set password for '用戶名'@'主機ip地址' = password('新密碼');
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把''海皇戟''用戶的密碼改爲"root"

set password for 'Trident'@'localhost' = password('root');
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方式二(改表, 須要刷新權限):

UPDATE `mysql`.`user` SET `Password` = password('新密碼') where user = '用戶名' and host = 'localhost';
FLUSH PRIVILEGES;
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把'海皇戟'用戶的密碼再次改爲"123456"

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

• [MySQL光速入門]029 數據庫管理和維護
• [MySQL光速入門]031 權限管理