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<?php
declare(strict_types=1);
namespace Doctrine\ORM\Id;
use Doctrine\ORM\EntityManagerInterface;
/**
* Id generator that uses a single-row database table and a hi/lo algorithm.
*
* @deprecated no replacement planned
*/
class TableGenerator extends AbstractIdGenerator
{
/** @var string */
private $_tableName;
/** @var string */
private $_sequenceName;
/** @var int */
private $_allocationSize;
/** @var int|null */
private $_nextValue;
/** @var int|null */
private $_maxValue;
/**
* @param string $tableName
* @param string $sequenceName
* @param int $allocationSize
*/
public function __construct($tableName, $sequenceName = 'default', $allocationSize = 10)
{
$this->_tableName = $tableName;
$this->_sequenceName = $sequenceName;
$this->_allocationSize = $allocationSize;
}
/**
* {@inheritDoc}
*/
public function generateId(
EntityManagerInterface $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 = $conn->fetchOne($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->executeStatement($updateSql, [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++;
}
}
|
