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<?php
namespace Doctrine\ORM\Id;
use Doctrine\ORM\EntityManager;
/**
* Id generator that uses a single-row database table and a hi/lo algorithm.
*
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @link www.doctrine-project.org
* @since 2.0
* @version $Revision$
* @author Benjamin Eberlei <kontakt@beberlei.de>
* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
* @author Jonathan Wage <jonwage@gmail.com>
* @author Roman Borschel <roman@code-factory.org>
*/
class TableGenerator extends AbstractIdGenerator
{
private $_tableName;
private $_sequenceName;
private $_allocationSize;
private $_nextValue;
private $_maxValue;
public function __construct($tableName, $sequenceName = 'default', $allocationSize = 10)
{
$this->_tableName = $tableName;
$this->_sequenceName = $sequenceName;
$this->_allocationSize = $allocationSize;
}
public function generate(EntityManager $em, $entity)
{
if ($this->_maxValue === null || $this->_nextValue == $this->_maxValue) {
// Allocate new values
$conn = $em->getConnection();
if ($conn->getTransactionNestingLevel() == 0) {
// use select for update
$sql = $conn->getDatabasePlatform()->getTableHiLoCurrentValSql($this->_tableName, $this->_sequenceName);
$currentLevel = $conn->fetchColumn($sql);
if ($currentLevel != null) {
$this->_nextValue = $currentLevel;
$this->_maxValue = $this->_nextValue + $this->_allocationSize;
$updateSql = $conn->getDatabasePlatform()->getTableHiLoUpdateNextValSql(
$this->_tableName, $this->_sequenceName, $this->_allocationSize
);
if ($conn->executeUpdate($updateSql, array(1 => $currentLevel, 2 => $currentLevel+1)) !== 1) {
// no affected rows, concurrency issue, throw exception
}
} else {
// no current level returned, TableGenerator seems to be broken, throw exception
}
} else {
// only table locks help here, implement this or throw exception?
// or do we want to work with table locks exclusively?
}
}
return $this->_nextValue++;
}
}