我需要一种更有效的方法将JDBC结果集转换为JSON数组

import java.sql.*;

public class JdbcToJson {
    public static void main(String[] args) {
        // JDBC连接信息
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String username = "username";
        String password = "password";

        try {
            // 加载数据库驱动
            Class.forName("com.mysql.jdbc.Driver");

            // 建立数据库连接
            Connection conn = DriverManager.getConnection(url, username, password);

            // 创建查询语句
            String sql = "SELECT * FROM mytable";
            Statement statement = conn.createStatement();

            // 执行查询，并获取结果集
            ResultSet resultSet = statement.executeQuery(sql);

            // 转换结果集为JSON数组
            JSONArray jsonArray = new JSONArray();
            ResultSetMetaData metaData = resultSet.getMetaData();
            int columnCount = metaData.getColumnCount();

            while (resultSet.next()) {
                JSONObject obj = new JSONObject();

                for (int i = 1; i <= columnCount; i++) {
                    String columnName = metaData.getColumnLabel(i);
                    Object value = resultSet.getObject(i);

                    obj.put(columnName, value);
                }

                jsonArray.add(obj);
            }

            // 关闭连接
            resultSet.close();
            statement.close();
            conn.close();

            // 输出JSON数组
            System.out.println(jsonArray.toJSONString());

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}