Custom Query in magento

<?php
//select query
$read = Mage::getSingleton(‘core/resource’)->getConnection(‘core_read’);
//make connection
$qry = “select name FROM user_data WHERE id=1 LIMIT 1 “; 
//query
$res = $read->fetchRow($qry); //fetch row
$name = $res[‘name’]; //outputs name

//other form
$qry = “select name FROM user_data WHERE namer LIKE ‘%a%’ “;
//query
$res = $read->fetchAll($qry); //get array

//Insert query
$write = Mage::getSingleton(‘core/resource’)->getConnection(‘core_write’);
$sql = “INSERT INTO user_data values (?,?)”; //insert query
$write->query($sql, array(‘name’,’pass’)); //write to database

?>