8.0.##版本的mysql使用低版本的MySql.Data.dll，連線資料庫時會報錯：Authentication method 'caching_sha2_password' not supported by any of the available plugins.

解決方式：（兩種）,第一種需要重啟mysql服務，第二種不需要重啟服務

第一種:

mysql檔案中增加my.ini檔案，內容如下，關鍵時最後一行：default_authentication_plugin=mysql_native_password

然後修改mysql的配置檔案路徑：

開啟cmd，進入命令列，輸入：mysqld  --defaults-file="D:\soft\mysql-8.0.23-winx64\my.ini"
 

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html
# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the
# *** default location during install, and will be replaced if you
# *** upgrade to a newer version of MySQL.
[client]
 
default-character-set = utf8mb4
[mysql]
default-character-set = utf8mb4
[mysqld]
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_bin
init_connect='SET NAMES utf8mb4'
# Remove leading # and set to the amount of RAM for the most important data
# cache in
 
 MySQL. Start at 70% of total RAM for dedicated server, else 10%.
innodb_buffer_pool_size = 128M
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
# These are commonly set, remove the # and set as required.
basedir = D:\\soft\mysql-8.0.23-winx64
datadir = D:\\soft\mysql-8.0.23-winx64\data
port = 3306
# server_id = .....
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
join_buffer_size = 128M
sort_buffer_size = 16M
read_rnd_buffer_size = 16M 
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
default_authentication_plugin=mysql_native_password

然後重啟mysql服務：

net stop mysql

net start mysql

第二種

更換高版本的MySql.Data.dll檔案

地址：https://files.cnblogs.com/files/blogs/667310/MySql.Data.rar

不需要重啟mysql服務