Magento: Direct MySQL query for create, read, update and delete

Magento database MySQL read and write adapters.

//database read adapter 
$read = Mage::getSingleton('core/resource')->getConnection('core_read'); 

//database write adapter 
$write = Mage::getSingleton('core/resource')->getConnection('core_write');

//Functions of read and write adapter
$readMethods = get_class_methods(get_class($read));foreach($readMethods as $r){echo $r."\n";}
$writeMethods = get_class_methods(get_class($write));foreach($writeMethods as $r){echo $r."\n";}

Magento Read Query, returns an array.

$results = $read->fetchAll("select * from customer_entity where email like '%@codexpedia.com'"); 
var_dump($results[0]);
foreach($results as $r)
{
	var_dump($r);
}

Magento Insert Query.

$write->insert(
		"A_TABLE_NANE", 
		array("a_column_name" => value, "a_column_name" => value)
);

Magento Update Query.

$write->update(
		"A_TABLE_NANE",
		array("a_column_name" => value, "a_column_name" => value),
		"entity_id=18"
);

Magento Delete Query.

$write->delete(
	"A_TABLE_NANE",
	"entity_id=18"
);

Magento Raw Query. It can be used for create, read, update, and delete operations.

//raw query Varien_Db_Statement_Pdo_Mysql
$customers = $read->query("select * from customer_entity");
var_dump($customers);
foreach($customers as $c)
{
	var_dump($c);
}