Java JDBC在insert之后从缺省值中检索值

import java.sql.*;

public class JDBCTest {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String username = "root";
        String password = "password";

        try {
            // 连接数据库
            Connection connection = DriverManager.getConnection(url, username, password);

            // 创建插入数据的SQL语句
            String sql = "INSERT INTO mytable (id, name, age) VALUES (?, ?, ?)";

            // 创建PreparedStatement对象，并设置参数
            PreparedStatement statement = connection.prepareStatement(sql);
            statement.setInt(1, 1);
            statement.setString(2, "John");
            statement.setInt(3, 25);

            // 执行插入操作
            statement.executeUpdate();

            // 创建查询数据的SQL语句
            String querySql = "SELECT * FROM mytable WHERE id = ?";

            // 创建PreparedStatement对象，并设置参数
            PreparedStatement queryStatement = connection.prepareStatement(querySql);
            queryStatement.setInt(1, 1);

            // 执行查询操作
            ResultSet resultSet = queryStatement.executeQuery();

            // 检索查询结果
            if (resultSet.next()) {
                int id = resultSet.getInt("id");
                String name = resultSet.getString("name");
                int age = resultSet.getInt("age");

                System.out.println("ID: " + id);
                System.out.println("Name: " + name);
                System.out.println("Age: " + age);
            }

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