标签：let DBName 连接 代码 连接数 drop 添加 格式 执行命令
以root用户登录数据库，运行以下命令：
create user test identified by ‘123456789‘;
上面创建了用户test,密码是123456789。我们在mysql.user表里面可以看到新增的用户信息
+------+----------------+-------------------------------------------+
| user | host | password |
+------+----------------+-------------------------------------------+
| test | % | *CC67043C7BCFF5EEA5566BD9B1F3C74FD9A5CF5D |
+------+----------------+-------------------------------------------+
命令格式：grant privilegesCode on dbName.tableName to username@host identified by "password";
MariaDB [test]> grant all privileges on test.* to ‘test‘@‘%‘ identified by ‘123456789‘; Query OK, 0 rows affected (0.00 sec) MariaDB [test]> flush privileges; Query OK, 0 rows affected (0.00 sec)
上面的语句将test表的所有操作权限都给了用户test，并且密码是123456789 同样我们查看mysql.user的信息
select user,host,password, Select_priv,Insert_priv, Update_priv ,Delete_priv from user where user=‘test‘; +------+----------------+-------------------------------------------+-------------+-------------+-------------+-------------+ | user | host | password | Select_priv | Insert_priv | Update_priv | Delete_priv | +------+----------------+-------------------------------------------+-------------+-------------+-------------+-------------+ | test | % | *CC67043C7BCFF5EEA5566BD9B1F3C74FD9A5CF5D | Y | Y | Y | Y | +------+----------------+-------------------------------------------+-------------+-------------+-------------+-------------+ 1 rows in set (0.00 sec)
也可以使用show grants命令查看授权的权限信息
show grants for ‘test‘; +--------------------------------------------------------------------------------------------------------------+ | Grants for test@% | +--------------------------------------------------------------------------------------------------------------+ | GRANT ALL PRIVILEGES ON *.* TO ‘test‘@‘%‘ IDENTIFIED BY PASSWORD ‘*CC67043C7BCFF5EEA5566BD9B1F3C74FD9A5CF5D‘ | | GRANT ALL PRIVILEGES ON `test`.* TO ‘test‘@‘%‘ | +--------------------------------------------------------------------------------------------------------------+ 2 rows in set (0.00 sec)
update mysql.user set password = password(‘123‘) where user = ‘test‘ and host = ‘%‘; flush privileges;
drop user test@‘%‘;
drop user命令会删除用户以及对应的权限，执行命令后你会发现mysql.user表和mysql.db表的相应记录都消失了。
当我们部署代码的时候需要创建用户并且赋予操作数据库的权限，那我们可以使用命令：
grant privilegesCode on dbName.tableName to username@host identified by "password";
需要注意的是，当我们操作权限的时候，需要选择host，也就是允许访问的地址 比如
同时当一切都准备好了之后，当我们在另一台机器访问的时候，如果出现下面的错误：
# mysql -h192.168.31.106 -utest -p; Enter password: ERROR 2003 (HY000): Can‘t connect to MySQL server on ‘192.168.31.106‘ (113)
1、确定远程机器的防火墙关闭，或在防火墙允许3306端口号
2、确定数据库允许远程访问，通过语句grant privilegesCode on dbName.tableName to username@host identified by "password";授权对应的host就可以了。
mysql添加，授权，删除用户以及连接数据库Can't connect to MySQL server on '192.168.31.106' (113)错误排查
标签：let DBName 连接 代码 连接数 drop 添加 格式 执行命令
原文地址：https://www.cnblogs.com/ricklz/p/12272073.html
