将不明确的ResultSet作为ArrayList返回的Java、MySQL方法

import java.sql.*;
import java.util.ArrayList;

public class DatabaseUtils {
    public static ArrayList<String> getResultSetAsArrayList(ResultSet resultSet) throws SQLException {
        ArrayList<String> resultList = new ArrayList<>();
        ResultSetMetaData metaData = resultSet.getMetaData();
        int columnCount = metaData.getColumnCount();

        while (resultSet.next()) {
            StringBuilder row = new StringBuilder();
            for (int i = 1; i <= columnCount; i++) {
                row.append(resultSet.getString(i)).append(" ");
            }
            resultList.add(row.toString().trim());
        }

        return resultList;
    }

    public static void main(String[] args) {
        try {
            // 连接数据库
            Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");
            Statement statement = connection.createStatement();

            // 执行查询语句
            ResultSet resultSet = statement.executeQuery("SELECT * FROM mytable");

            // 将ResultSet转换为ArrayList
            ArrayList<String> resultList = getResultSetAsArrayList(resultSet);

            // 输出结果
            for (String result : resultList) {
                System.out.println(result);
            }

            // 关闭连接
            resultSet.close();
            statement.close();
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}