Magento : select, insert, update, and delete data

CRUD_Operation.php

//INSERT DATA

$data = array('title'=>'hello there','content'=>'how are you? i am fine over here.','status'=>1);
$model = Mage::getModel('mynews/mynews')->setData($data);
try {
		$insertId = $model->save()->getId();
		echo "Data successfully inserted. Insert ID: ".$insertId;
	} catch (Exception $e){
	 echo $e->getMessage();   
}
//$data contains array of data to be inserted. The key of the array should be the database table’s field name and the value should be the value to be inserted.


//SELECT DATA
//$item->getData() prints array of data from ‘news’ table.
//$item->getTitle() prints the only the title field.
//Similarly, to print content, we need to write $item->getContent().

$model = Mage::getModel('mynews/mynews');
$collection = $model->getCollection();
foreach($collection as $item){
	print_r($item->getData());
	print_r($item->getTitle());
}


//UPDATE DATA
//$id is the database table row id to be updated.
//$data contains array of data to be updated. The key of the array should be the database table’s field name and the value should be the value to be updated.
// $id = $this->getRequest()->getParam('id');
$id = 2;
$data = array('title'=>'hello test','content'=>'test how are you?','status'=>0);
$model = Mage::getModel('mynews/mynews')->load($id)->addData($data);
try {
		$model->setId($id)->save();
		echo "Data updated successfully.";
	   
	} catch (Exception $e){
		echo $e->getMessage(); 
}


//DELETE DATA
// $id = $this->getRequest()->getParam('id');
$id = 3;
$model = Mage::getModel('mynews/mynews');
try {
		$model->setId($id)->delete();
		echo "Data deleted successfully.";
	   
	} catch (Exception $e){
		echo $e->getMessage(); 
}