命令:
CREATE USER 'username'@'host' IDENTIFIED BY 'password';
说明:
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'@'%';
CREATE USER 'test'@'%' IDENTIFIED BY '123456';
test是用户名
%表示所有机器都可以访问,也可以指定,例如'localhost'限制只能本机访问,’111.222.33.44‘ - 指定 ip 才能访问
123456是密码
命令:
GRANT privileges ON databasename.tablename TO 'username'@'host'
说明:
例子:
GRANT SELECT, INSERT ON test.user TO 'pig'@'%'; GRANT ALL ON *.* TO 'pig'@'%'; GRANT ALL ON maindataplus.* TO 'pig'@'%';
注意:
用以上命令授权的用户不能给其它用户授权,如果想让该用户可以授权,用以下命令:
GRANT privileges ON databasename.tablename TO 'username'@'host' WITH GRANT OPTION;
命令:
SET PASSWORD FOR 'username'@'host' = PASSWORD('newpassword');
如果是当前登陆用户用:
SET PASSWORD = PASSWORD("newpassword");
例子:
SET PASSWORD FOR 'pig'@'%' = PASSWORD("123456");
命令:
REVOKE privilege ON databasename.tablename FROM 'username'@'host';
说明:
privilege, databasename, tablename:同授权部分
例子:
REVOKE SELECT ON *.* FROM 'pig'@'%';
注意:
假如你在给用户'pig'@'%'授权的时候是这样的(或类似的):GRANT SELECT ON test.user TO 'pig'@'%',则在使用REVOKE SELECT ON *.* FROM 'pig'@'%';命令并不能撤销该用户对test数据库中user表的SELECT 操作。相反,如果授权使用的是GRANT SELECT ON *.* TO 'pig'@'%';则REVOKE SELECT ON test.user FROM 'pig'@'%';命令也不能撤销该用户对test数据库中user表的Select权限。
具体信息可以用命令SHOW GRANTS FOR 'pig'@'%'; 查看。
命令:
DROP USER 'username'@'host';
SELECT DISTINCT CONCAT('User: ''',user,'''@''',host,''';') AS query FROM mysql.user;
查看数据库中具体某个用户的权限:
show grants for 'root'@'%';