java不会向数据库添加条目

import java.sql.*;

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

        // SQL语句
        String sql = "INSERT INTO mytable (column1, column2) VALUES (?, ?)";

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

            // 创建PreparedStatement对象，用于执行SQL语句
            PreparedStatement statement = connection.prepareStatement(sql);

            // 设置参数值
            statement.setString(1, "value1");
            statement.setString(2, "value2");

            // 执行SQL语句
            statement.executeUpdate();

            // 关闭连接和statement
            statement.close();
            connection.close();

            System.out.println("条目添加成功！");
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}