如何在Java中通过用户输入搜索特定的列？

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要搜索的列名：");
        String columnName = scanner.nextLine();
        // 其他代码逻辑
    }
}

import java.sql.*;

public class Main {
    public static void main(String[] args) {
        try {
            // 连接数据库
            Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");
            
            // 创建Statement对象
            Statement statement = connection.createStatement();
            
            // 执行查询语句
            String query = "SELECT * FROM mytable WHERE " + columnName + " = ?";
            PreparedStatement preparedStatement = connection.prepareStatement(query);
            preparedStatement.setString(1, userInput);
            ResultSet resultSet = preparedStatement.executeQuery();
            
            // 处理查询结果
            while (resultSet.next()) {
                // 获取结果集中的数据
                String result = resultSet.getString(columnName);
                System.out.println(result);
            }
            
            // 关闭连接
            resultSet.close();
            preparedStatement.close();
            statement.close();
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}