我正在尝试使用预准备语句执行sql查询，但它返回空值

import java.sql.*;

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

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            String sql = "SELECT * FROM users WHERE id = ?";
            try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
                pstmt.setInt(1, 123); // 假设我们要查询id为123的用户
                try (ResultSet rs = pstmt.executeQuery()) {
                    if (rs.next()) {
                        System.out.println("User found: " + rs.getString("name"));
                    } else {
                        System.out.println("No user found with the given ID.");
                    }
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}