权限管理
一 用户
1.1 创建用户
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grant all privileges on *.* to 用户名@localhost identified by ' 密码 ' with grant option
1.2 查询数据库中有哪些user
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select user from mysql.user;
二 权限
1 查看账号权限
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show grants for username@host;
2 更改账号权限
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grant select/update/.... on databasename.tablename to 'username'@'localhost';
eg:
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grant select on *.* to 'z2'@'localhost';
3 收回权限
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revoke privilege on databasename.tablename from user@localhost;
eg:
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revoke select, insert on *.* from z2@localhost;
4 修改账号密码(方法有很多)
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update mysql.user set password = password('123') where host = '%' and user ='username';
5 删除账号
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drop user user [,user]...
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eg:
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