1.进入mysql命令行，输入root及密码 [root@localhost ~]# mysql -u root -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 19 Server version: 5.7.22 MySQL Community Server (GPL) Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> 2.用户管理及权限设置 // 管理用户 mysql> use mysql; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed //查询用户 mysql> select host,user from user; +-----------+---------------+ | host | user | +-----------+---------------+ | % | root | | % | test | | localhost | mysql.session | | localhost | mysql.sys | | localhost | root | +-----------+---------------+ 5 rows in set (0.00 sec) //创建用户（用户：admin，密码:123456） mysql> create user admin identified by '123456'; Query OK, 0 rows affected (0.00 sec) // 删除用户admin mysql> drop user admin; Query OK, 0 rows affected (0.00 sec) // 重新创建用户（用户：admins，密码:123456） mysql> create user admins identified by '123456'; Query OK, 0 rows affected (0.00 sec) mysql> select host, user from user; +-----------+---------------+ | host | user | +-----------+---------------+ | % | admins | | % | root | | % | test | | localhost | mysql.session | | localhost | mysql.sys | | localhost | root | +-----------+---------------+ 6 rows in set (0.00 sec) // 查看用户admins的权限 mysql> show grants for admins; +------------------------------------+ | Grants for admins@% | +------------------------------------+ | GRANT USAGE ON *.* TO 'admins'@'%' | +------------------------------------+ 1 row in set (0.00 sec) // 赋予权限（给用户admins，授予数据库test的查询权限） mysql> grant select on test.* to admins; Query OK, 0 rows affected (0.00 sec) // 查看用户admins的权限 mysql> show grants for admins; +------------------------------------------+ | Grants for admins@% | +------------------------------------------+ | GRANT USAGE ON *.* TO 'admins'@'%' | | GRANT SELECT ON `test`.* TO 'admins'@'%' | +------------------------------------------+ 2 rows in set (0.00 sec) // 收回权限（对用户admins，收回数据库test的查询权限） mysql> revoke select on test.* from admins; Query OK, 0 rows affected (0.01 sec) // 查看用户admins的权限 mysql> show grants for admins; +------------------------------------+ | Grants for admins@% | +------------------------------------+ | GRANT USAGE ON *.* TO 'admins'@'%' | +------------------------------------+ 1 row in set (0.00 sec) // 赋予权限（给用户admins，授予数据库test的查询、更新、删除、插入等权限） mysql> grant select, update, delete, insert on test.* to admins; Query OK, 0 rows affected (0.00 sec) // 查看用户admins的权限 mysql> show grants for admins; +------------------------------------------------------------------+ | Grants for admins@% | +------------------------------------------------------------------+ | GRANT USAGE ON *.* TO 'admins'@'%' | | GRANT SELECT, INSERT, UPDATE, DELETE ON `test`.* TO 'admins'@'%' | +------------------------------------------------------------------+ 2 rows in set (0.01 sec) // 赋予权限（给用户admins，授予数据库test的新建表、删除表或删除数据库等权限） mysql> grant create,drop on test.* to admins; Query OK, 0 rows affected (0.00 sec) // 查看用户admins的权限 mysql> show grants for admins; +--------------------------------------------------------------------------------+ | Grants for admins@% | +--------------------------------------------------------------------------------+ | GRANT USAGE ON *.* TO 'admins'@'%' | | GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP ON `test`.* TO 'admins'@'%' | +--------------------------------------------------------------------------------+ 2 rows in set (0.00 sec) // 刷新权限（使设置的权限生效） mysql> flush privileges; Query OK, 0 rows affected (0.00 sec) // 查看root的权限 mysql> show grants for root; +-------------------------------------------+ | Grants for root@% | +-------------------------------------------+ | GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' | +-------------------------------------------+ 1 row in set (0.00 sec) ---------------------
以下是用户可以享受的常见可能权限的简短列表。
ALL PRIVILEGES - 正如我们前面所看到的，这将允许MySQL用户访问指定的数据库（或者如果系统中没有选择数据库） CREATE-允许他们创建新的表或数据库 DROP-允许他们删除表或数据库 DELETE-允许他们从表中删除行 INSERT-允许它们向表中插入行 SELECT-允许他们使用Select命令来读取数据库 UPDATE-允许他们更新表行 GRANT OPTION - 允许他们授予或删除其他用户的权限
要向特定用户提供权限，可以使用此框架：
GRANT [type of permission] ON [database name].[table name] TO ‘[username]’@'localhost’;
如果要向其授予对任何数据库或任何表的访问权限，请确保在数据库名称或表名称的地方放置星号（*）。 每次更新或更改权限时，请务必使用Flush Privileges命令。
如果您需要撤消权限，则结构与授予的结构几乎相同： REVOKE [type of permission] ON [database name].[table name] FROM ‘[username]’@‘localhost’;
正如您可以使用DROP删除数据库一样，您可以使用DROP完全删除用户： DROP USER ‘demo’@‘localhost’;
要测试您的新用户，请通过键入注销 quit
并使用此命令在终端中重新登录： mysql -u [username]-p
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