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<?php
/**
*
* This file is part of Aura for PHP.
*
* @license http://opensource.org/licenses/bsd-license.php BSD
*
*/
namespace Aura\Sql\Iterator;
use Iterator;
use PDOStatement;
/**
*
* A base class for iterators.
*
* @package Aura.Sql
*
*/
abstract class AbstractIterator implements Iterator
{
/**
*
* PDO statement.
*
* @var PDOStatement
*
*/
protected $statement;
/**
*
* Current row value.
*
* @var mixed
*
*/
protected $row;
/**
*
* Current key.
*
* @var mixed
*
*/
protected $key = -1;
/**
*
* Frees memory when object is destroyed.
*
*/
public function __destruct()
{
$this->statement->closeCursor();
unset($this->statement);
}
/**
*
* Moves row set pointer to first element.
*
*/
public function rewind()
{
$this->key = -1;
$this->next();
}
/**
*
* Returns value at current position.
*
* @return mixed
*
*/
public function current()
{
return $this->row;
}
/**
*
* Returns key at current position.
*
* @return mixed
*
*/
public function key()
{
return $this->key;
}
/**
*
* Fetches next row from statement.
*
*/
abstract public function next();
/**
*
* Detects if iterator state is valid.
*
* @return bool
*
*/
public function valid()
{
return $this->row !== false;
}
}
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