如何在不使用微调器的情况下使用mssql进行多登录

Question

我正在尝试为没有旋转器功能的不同用户进行多次登录。所以我在Microsoft sql server management studio中有admin和user group-id。到目前为止，这是我在登录按钮上所拥有的。想要使管理员将进入管理页面，而用户将进入用户页面。谢谢

 @Override
        protected String doInBackground(String... params)
        {

            if(username.trim().equals("")|| password.trim().equals(""))
                z = "Please enter Username and Password";
            else
            {
                try
                {
                    Connection con = connectionClass.CONN();

                    if (con == null)
                    {
                        z = "Check Your Internet Access!";
                    }
                    else
                    {
                        String query = "select * from tbl_userpassword where userid= '" + username.toString() + "' and password = '"+ password.toString() +"' ";
                        Statement stmt = con.createStatement();
                        ResultSet rs = stmt.executeQuery(query);
                        if(rs.next())
                        {
                            z = "Login successful";
                            isSuccess=true;
                            //con.close();
                            AdminLoginActivity();
                        }
                        else
                        {
                            z = "Invalid Credentials!";
                            isSuccess = false;
                        }
                    }
                }
                catch (Exception ex)
                {
                    isSuccess = false;
                    z = ex.getMessage();
                }
            }
            return z;
        }
    }