连接到mysql出现 Client does not support authentication protocol requested by server;错误解决方法_mysql client does not support authentication

 

1.安装mysql8.0

   1）配置文件my.ini(8.0的my.ini文件在D:\ProgramData\MySQL\MySQL Server 8.0文件夹中。

2.安装Navicat

   1）连接到mysql出现 Client does not support authentication protocol requested by server;

        解决办法：ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '新密码';

3.eclipse通过jdbc连接到 mysql

    1）获取连接失败Could not create connection to database server.

       所有安装都是最新版，故JDBC连接的jar包也需最新版

 

更改密码和密码认证插件

 

　　在MySQL安装目录的 bin 目录下执行命令：

mysql -u root -p
　　这时候会提示输入密码，记住了上面第1.3步安装时的密码，填入即可登录成功，进入MySQL命令模式。

在MySQL8.0.4以前，执行

SET PASSWORD=PASSWORD('[修改的密码]');
就可以更改密码，但是MySQL8.0.4开始，这样默认是不行的。因为之前，MySQL的密码认证插件是“mysql_native_password”，而现在使用的是“caching_sha2_password”。

　　因为当前有很多数据库工具和链接包都不支持“caching_sha2_password”，为了方便，我暂时还是改回了“mysql_native_password”认证插件。

修改用户密码，在MySQL中执行命令：

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '新密码';
修改密码验证插件，同时修改密码。

　　如果想默认使用“mysql_native_password”插件认证，可以在配置文件中配置default_authentication_plugin项。

[mysqld]
default_authentication_plugin=mysql_native_password

示例：

C:\Program Files\MySQL\bin>mysql -u root -p
Enter password: ************
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.11
 
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> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '新密码';
Query OK, 0 rows affected (0.06 sec)
 
mysql>

 

参考：https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html#upgrade-caching-sha2-password

 

　　到此，安装部署就完成了。官方说测试速度MySQL8比5快两倍。

 

　　可以用 命令查看一下默认安装的数据库：

show databases;

use mysql;

show tables;

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
4 rows in set (0.01 sec)
 
mysql>

 

看到默认初始化了mysql数据库，其中user表里面存储MySQL用户信息。我们可以看一下默认MySQL用户：

 select user,host,authentication_string from mysql.user;

mysql> select user,host,authentication_string from mysql.user;
+------------------+-----------+-------------------------------------------+
| user             | host      | authentication_string                     |
+------------------+-----------+-------------------------------------------+
| mysql.infoschema | localhost | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| mysql.session    | localhost | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| mysql.sys        | localhost | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| root             | localhost | *27C237A977F4F44D3F551F1A673BE14DFD232961 |
+------------------+-----------+-------------------------------------------+
4 rows in set (0.00 sec)
 
mysql>

 

管理员root的host是localhost，代表仅限localhost登录访问。如果要允许开放其他ip登录，则需要添加新的host。如果要允许所有ip访问，可以直接修改成“%”

创建用户：

CREATE USER 'xxh'@'%' IDENTIFIED WITH mysql_native_password BY 'xxh123!@#';

#(需要注意：mysql8.0加密方式修改了)
#检查用户

select user, host, plugin, authentication_string from user\G;

授权远程数据库

#授权所有权限
GRANT ALL PRIVILEGES ON *.* TO 'xxh'@'%'；
#授权基本的查询修改权限，按需求设置
GRANT SELECT,INSERT,UPDATE,DELETE,CREATE,DROP,ALTER ON *.* TO 'xxh'@'%';

查看用户权限
show grants for 'xxh'@'%';

 

示例：

 

mysql> use mysql;
Database changed
mysql> CREATE USER 'xxh'@'%' IDENTIFIED WITH mysql_native_password BY 'xxh123!@#'; #创建用户(注意：mysql8.0加密方式修改了)
Query OK, 0 rows affected (0.07 sec)

mysql> 

 

查看密码加密方式：

 

mysql> select user, host, plugin, authentication_string from user;
+------------------+-----------+-----------------------+-------------------------------------------+
| user             | host      | plugin                | authentication_string                     |
+------------------+-----------+-----------------------+-------------------------------------------+
| xxh              | %         | mysql_native_password | *70FD6FB4F675E08FF785A754755B5EBA6DA62851 |
| mysql.infoschema | localhost | mysql_native_password | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| mysql.session    | localhost | mysql_native_password | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| mysql.sys        | localhost | mysql_native_password | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| root             | localhost | mysql_native_password | *27C237A977F4F44D3F551F1A673BE14DFD232961 |
+------------------+-----------+-----------------------+-------------------------------------------+
5 rows in set (0.00 sec)
 
mysql>

 

 

　　另外，如果需要新增账户，或者本机以外的其他人访问MySQL则还需要设置内置账户的host，具体可以参考：MySQL创建用户与授权