错误:客户端不支持服务器请求的认证协议；考虑升级 MySQL 客户端

问题描述：

在执行 JDBC 程序时，连接到数据库时出现以下错误:

While executing a JDBC program, I get the following error while connecting to database:

Exception in thread "main" 
com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: Client does 
not support authentication protocol requested by server; consider upgrading 
MySQL client
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:921)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:885)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3421)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1247)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2775)
at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
at 
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:270)
at main.java.MyFirstJdbcProgram.readDataBase(MyFirstJdbcProgram.java:23)
at main.java.Main.main(Main.java:6)

当我研究这个时，我知道下面的错误是因为我需要向用户授予权限，所以按照

When I researched this, I got to know that the below error is because I need to grant the privileges to the user, so follow

mysql -u root -p
然后输入密码
然后我跑了

mysql -u root -p
then entered the password
then I ran

GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY 'mypassword';

我也用过

UPDATE user SET authentication_string=password('mypassword') WHERE user='root';

但是我遇到了以下错误

ERROR 1064 (42000):您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册在第 1 行的 'IDENTIFIED BY 'mypassword'' 附近使用的语法

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IDENTIFIED BY 'mypassword'' at line 1

答

出现此错误是因为您使用的是 MySQL Connector/J 5.1.45 或更早版本.MySQL 8 引入了一种新的身份验证机制(caching_sha2_password)，这些版本的驱动程序不支持该机制.

This error occurs because you are using MySQL Connector/J 5.1.45 or earlier. MySQL 8 introduced a new authentication mechanism (caching_sha2_password) that is not supported in those versions of the driver.

您需要升级到 MySQL Connector/J 5.1.46 或更高版本.在撰写本文时，MySQL Connector/J 驱动程序的最新版本是 8.0.15.你可以从 https://dev.mysql.com/downloads/connector/j/ 或在 Maven/Gradle 等中指定正确的版本

You will need to upgrade to MySQL Connector/J 5.1.46 or higher. The latest version of the MySQL Connector/J driver at time of writing is 8.0.15. You can download it from https://dev.mysql.com/downloads/connector/j/ or specify the right version in Maven/Gradle, etc.

错误:客户端不支持服务器请求的认证协议；考虑升级 MySQL 客户端

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