Update - MySQL - Java

package testmysql;

import com.mysql.jdbc.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class UpdateMySQL {

    private Connection conn;

    public void testConnectMySQL() {
        String db = "TestMySQL"; //Tên database
        String user = "root"; //Mặc định là root
        String pass = "admin"; //Mật khẩu quản trị MySQL
        try {
            String url = "jdbc:mysql://localhost/" + db + "?user=" + user + "&password=" + pass;
            Class.forName("com.mysql.jdbc.Driver");
            conn = (Connection) DriverManager.getConnection(url);
            System.out.println("Kết nối thành công.");

            Statement stmt = conn.createStatement();
            String sql = "UPDATE user SET username='ThieuMao', password='LeoLinhTinh' WHERE id='1'";
            stmt.executeUpdate(sql);
            stmt.close();

        } catch (Exception e) {
            System.out.println("Lỗi: " + e.getMessage());
        }
    }

    public static void main(String[] args) {
        UpdateMySQL tm = new UpdateMySQL();
        tm.testConnectMySQL();
    }
}