Question

我正在尝试连接到远程服务器上的MySQL数据库但是我得到一个例外，查询对于数据包来说很大。我甚至没有发出任何疑问。

com.mysql.cj.jdbc.exceptions.PacketTooBigException：查询的数据包太大（4 739 923＆gt; 65 535）。您可以通过设置'max_allowed_packet'变量来更改服务器上的此值。

代码：

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class Main {

static Connection connection = null;
static PreparedStatement preparedStatement = null;

public static void main(String[] argv) {

    try {
        makeJDBCConnection();
        preparedStatement.close();
        connection.close(); // connection close
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

private static void makeJDBCConnection() {

    try {
        Class.forName("com.mysql.cj.jdbc.Driver");
    } catch (ClassNotFoundException e) {
        log("Couldn't found JDBC driver.");
        e.printStackTrace();
        return;
    }

    try {
        // DriverManager: The basic service for managing a set of JDBC drivers.
        connection = DriverManager.getConnection("jdbc:mysql://193.219.91.103:13667", "root", "root");
        if (connection != null) {
            log("Connection Successful! ");
        } else {
            log("Failed to make connection!");
        }
    } catch (SQLException e) {
        log("MySQL Connection Failed!");
        e.printStackTrace();
        return;
    }
}

private static void log(String string) {
    System.out.println(string);
    }
}

Answer 1

如果您有权访问服务器端，则必须更改mysql配置文件。见https://dev.mysql.com/doc/refman/5.6/en/option-files.html

JDBC数据包查询重载，没有查询

1 个答案: