mysql 8.0.20 版本 jdbc问题

[lurie大神]

*是我隐藏了相关数据
public class DbUtil {

public static final String URL = "jdbc:mysql://*.*.*.*:*/test?useUnicode=true&characterEncoding=utf-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC";
public static final String USER = "*";
public static final String PASSWORD = "*";

public static void main(String[] args) throws Exception {
Class.forName("com.mysql.cj.jdbc.Driver");
Connection conn = DriverManager.getConnection(URL, USER, PASSWORD);
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM user");
while (rs.next()) {
System.out.println(rs.getString("id") + " name：" + rs.getInt("name"));
}
}
}
pom
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>test</groupId>
<artifactId>test</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.20</version>
</dependency>
</dependencies>
</project>

数据库版本为
mysql> select version();
+-----------+
| version() |
+-----------+
| 8.0.20 |
+-----------+
1 row in set (0.37 sec)

mysql>


运行居然报错
Exception in thread "main" java.sql.SQLException: Unknown system variable 'query_cache_size'
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)

[带我飞的云]

1. mysql-connecter-java的版本过低，很显然是数据库驱动程序与数据库版本不对应
2. query cache 在Mysql 8.0之后就被移除了

[lurie大神]

引用 1 楼 带我飞的云的回复:

1. mysql-connecter-java的版本过低，很显然是数据库驱动程序与数据库版本不对应
2. query cache 在Mysql 8.0之后就被移除了

你答的并不正确，看引入的驱动便可知

[lurie大神]

初步猜测原因可能是mysql使用了proxysql导致的？