JDBC2 dao 모델

public class JDBCUtilsOld {
    private static String url;
    private static String user;
    private static String password;
    private static String driverClass;

static{
    try {
        Properties pro = new Properties();
        FileReader fr = new FileReader("a.properties");
        pro.load(fr);
        url = pro.getProperty("url");
        user = pro.getProperty("user");
        password = pro.getProperty("password");
        driverClass = pro.getProperty("driverClass");
        Class.forName(driverClass);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

/**
 *                    
 * @return
 * @throws SQLException
 */

public static Connection getConnection() throws SQLException{
    return DriverManager.getConnection(url, user, password);
}

/**
 *                 
 * @throws SQLException 
 */
public static void  closeRes(PreparedStatement pstmt,ResultSet rs,Connection conn) throws SQLException{
    if(rs!=null){
        rs.close();
    }
    if(pstmt!=null){
        pstmt.close();
    }
    if(conn!=null){
        conn.close();
    }
}

service    
public class UserService {
    Userdao dao = new Userdao();
    //     
    public boolean register(Users users) throws SQLException{

    return dao.addUser(users);
        }
    }  

dao        
//        
    public boolean addUser(Users users) throws SQLException{
          
    Connection conn = JDBCUtilsOld.getConnection();
    String sql = "insert into users(uname,upassword) values(?,?)";
    //          
    PreparedStatement pstmt = conn.prepareStatement(sql);
    //    
    pstmt.setString(1, users.getUname());
    pstmt.setString(2, users.getUpassword());
    int rows = pstmt.executeUpdate();
    if(rows>0){
        return true;
    }

//       
    Connection conn = JDBCUtilsOld.getConnection();
        QueryRunner qr = new QueryRunner();
    String sql = "insert into users(uname,upassword) values(?,?)";
        PreparedStatement pstmt = conn.prepareStatement(sql);
    int rows = qr.update(conn,sql, users.getUname(),users.getUpassword());
        if(rows > 0) {
            return true;
        }
        JDBCUtilsOld.closeRes(pstmt, null, conn);
        return false;
        }

RegisterDemo 

public static void main(String[] args) throws SQLException {
    Scanner sc = new Scanner(System.in);
    Users users = new Users();
    System.out.println("        ");
    String uname = sc.next();
    System.out.println("       ");
    String upassword = sc.next();

    users.setUname(uname);
    users.setUpassword(upassword);

    UserService us = new UserService();

    boolean result = us.register(users);

    if(result == true){
        System.out.println("    ");
    }else{
        System.out.println("    ");
    }
}