Verify custom table in magento for custom module - php

Question

I have made the redirect from the question i have posted here
Now i have another form in the redirected page where i need to enter name and mobile number and if it matches in my db table helloworld it will go to one page or else to another
<p>You have successfully registered</p>
<div>
<label>Login</label>
</div>
<div>
<form action="" method="post">
<label> Username </label>
<strong>:</strong>
<input class="input-text required-entry" type="text" name="fname" maxlength="20">
<label>Mobile No</label>
<strong>:</strong>
<input class="required-entry" type="number" maxlength="10" name="mobileno">
<input type="submit" name="login" value="Login">
<input type="button" name="cancel" value="Cancel">
</form>
</div>
Can any one help me how no i can verify it with existing data in db and make this work ? Shall I start it with using index controller or is there any magento way?
Update:
this is my Indexcontroler.php after below answer update
<?php
class MyCustom_Helloworld_IndexController extends Mage_Core_Controller_Front_Action
{
/*
* this method privides default action.
*/
public function indexAction()
{
if($this->getRequest()->getParams()) {
$param = $this->getRequest()->getParams();
echo $firstname = $param['fname'];
$lastname = $param['lname'];
$address = $param['address'];
$state = $param['state'];
$city = $param['city'];
$mobile = $param['mobileno'];
$model = Mage::getModel('helloworld/helloworld');
// $model->setTitle($title);
$model->setFirstname($firstname);
$model->setLastname($lastname);
$model->setAddress($address);
$model->setState($state);
$model->setCity($city);
$model->setMobileno($mobile);
$model->save();
$this->_redirect('helloworld/index/login');
// $this->_redirectReferer();
}else {
/*
* Initialization of Mage_Core_Model_Layout model
*/
$this->loadLayout();
/*
* Building page according to layout confuration
*/
$this->renderLayout();
}
}
public function loginAction()
{
$this->loadLayout();
$this->renderLayout();
}
public function loginnAction()
{
if($this->getRequest()->getParams()) {
$param = $this->getRequest()->getParams();
$username = $param['fname'];
$mobile = $param['mobileno'];
$check = Mage::getModel('helloworld/helloworld')
->AddFieldToFilter('mobileno', array('eq' => $mobile))
->AddFieldToFilter('fname', array('eq' => $username));
if(count($check)==1) {
$this->_redirectReferer();
}else {
$this->_redirect('helloworld/index/login');
}
}
}
}

Answer 1

you can add check like that
public function loginAction()
{
if($this->getRequest()->getParams()) {
$param = $this->getRequest()->getParams();
$username = $param['fname'];
$mobile = $param['mobile'];
$connectionresource = Mage::getSingleton('core/resource');
$readconnection = $connectionresource->getConnection('core_read');
$table = $connectionresource->getTableName('helloworld/helloworld');
$allrecord = $readconnection->select()->from(array('helloworld'=>$table))->where('helloworld.mobileno=?', $mobileno)
->where('helloworld.fname=?', $username);
$alldata =$readconnection->fetchAll($allrecord);
if(count($alldata)==1) {
$this->_redirect('home');
}else {
$this->_redirect('customer/account');
}
}