Cloud Studio连接MySQL，Access denied for一系列问题

官方文档有写如何安装Mysql

$ apt update
$ apt install mysql-server mysql-client -y

$ service mysql start

mysql -uroot -p123456进入MySQL命令行

问题出在连接数据库这一步，命令行能进去，但是数据库插件和代码都连不上

Access denied for 

大概率是权限和密码的问题，进入

mysql> use mysql

mysql> select user,host, authentication_string from user;

注意%虽然是匹配全部但是不匹配localhost，所以说要解决在Cloud Studio中本地连接报错需要给要用的账号给localhost的权限，以root为例，如果报错就drop一下

mysql> CREATE USER 'root'@'localhost'   IDENTIFIED BY '12345678';
ERROR 1396 (HY000): Operation CREATE USER failed for 'root'@'localhost'
mysql> drop user root@'localhost';
Query OK, 0 rows affected (0.02 sec)
 
mysql> CREATE USER 'root'@'localhost'   IDENTIFIED BY '12345678';
Query OK, 0 rows affected (0.01 sec)
 
mysql> grant all privileges on *.* to 'root'@'localhost';

在创建时如果报错ERROR 1819 (HY000)，说明密码强度不满足要求，开发我们可以直接将密码强度设置成0

mysql> CREATE USER 'root'@'localhost'   IDENTIFIED BY '12345678';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> set global validate_password.policy=0;
Query OK, 0 rows affected (0.00 sec)

最后连接上了通过数据库插件连上了