golang连接mysql报错：this authentication plugin is not supported 解决方案

MysqL升级8.0以上版本后，在用第三方库github.com/Go-sql-Driver/MysqL打开数据库时会报错this authentication plugin is not supported，这是因为MysqL8.0版本修改了加密方式，所以只要修改一下密码的加密方式就可以了。

首先用root用户进入MysqL，修改root用户的密码和加密方式：这里修改密码为abc345
 

MysqL> alter user root@localhost identified with MysqL_native_password by 'abc345';
Query OK,0 rows affected (0.13 sec)

MysqL> 

查询当前所有用户：

MysqL> select host,user,plugin from MysqL.user;
+-----------+------------------+-----------------------+
| host      | user             | plugin                |
+-----------+------------------+-----------------------+
| 127.0.0.1 | Tom              | caching_sha2_password |
| localhost | Tom              | caching_sha2_password |
| localhost | MysqL.infoschema | caching_sha2_password |
| localhost | MysqL.session    | caching_sha2_password |
| localhost | MysqL.sys        | caching_sha2_password |
| localhost | root             | MysqL_native_password |
+-----------+------------------+-----------------------+
6 rows in set (0.00 sec)

MysqL> 

这里总共查询出来6个用户，刚才修改的是第6个，也就是最后一个用户| localhost | root | MysqL_native_password |的密码和加密方式。可以看到，该用户的加密方式MysqL_native_password已经不同于上面的其他5个加密方式了。

再修改其他用户：

MysqL> alter user Tom@127.0.0.1 identified with MysqL_native_password by '456789';
Query OK,0 rows affected (0.03 sec)

MysqL> 

查看：

MysqL> select host,plugin from MysqL.user;
+-----------+------------------+-----------------------+
| host      | user             | plugin                |
+-----------+------------------+-----------------------+
| 127.0.0.1 | Tom              | MysqL_native_password |
| localhost | Tom              | caching_sha2_password |
| localhost | MysqL.infoschema | caching_sha2_password |
| localhost | MysqL.session    | caching_sha2_password |
| localhost | MysqL.sys        | caching_sha2_password |
| localhost | root             | MysqL_native_password |
+-----------+------------------+-----------------------+
6 rows in set (0.00 sec)

MysqL> 

之后重启MysqL，再次连接就可以了。