java - 错误 : Client does not support authentication protocol requested by server; consider upgrading MySQL client

Question

在执行 JDBC 程序时，连接到数据库时出现以下错误:

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授予用户权限，所以按照

1. mysql -u root -p
2. 然后输入密码

3. 然后我跑了

   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): 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

Answer 1

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。

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。您可以从https://dev.mysql.com/downloads/connector/j/下载。或者在Maven/Gradle等中指定合适的版本