forked from rebillar/site-accueil-insa
127 lines
3.1 KiB
PHP
127 lines
3.1 KiB
PHP
<?php
|
|
/**
|
|
* Matomo - free/libre analytics platform
|
|
*
|
|
* @link https://matomo.org
|
|
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
|
|
*
|
|
*/
|
|
namespace Piwik;
|
|
|
|
use Exception;
|
|
use Piwik\Db\AdapterInterface;
|
|
|
|
/**
|
|
* Used for generating auto increment ids.
|
|
*
|
|
* Example:
|
|
*
|
|
* $sequence = new Sequence('my_sequence_name');
|
|
* $id = $sequence->getNextId();
|
|
* $db->insert('anytable', array('id' => $id, '...' => '...'));
|
|
*/
|
|
class Sequence
|
|
{
|
|
const TABLE_NAME = 'sequence';
|
|
/**
|
|
* @var string
|
|
*/
|
|
private $name;
|
|
|
|
/**
|
|
* @var AdapterInterface
|
|
*/
|
|
private $db;
|
|
|
|
/**
|
|
* @var string
|
|
*/
|
|
private $table;
|
|
|
|
/**
|
|
* The name of the table or sequence you want to get an id for.
|
|
*
|
|
* @param string $name eg 'archive_numeric_2014_11'
|
|
* @param AdapterInterface $db You can optionally pass a DB adapter to make it work against another database.
|
|
* @param string|null $tablePrefix
|
|
*/
|
|
public function __construct($name, $db = null, $tablePrefix = null)
|
|
{
|
|
$this->name = $name;
|
|
$this->db = $db ?: Db::get();
|
|
$this->table = $this->getTableName($tablePrefix);
|
|
}
|
|
|
|
/**
|
|
* Creates / initializes a new sequence.
|
|
*
|
|
* @param int $initialValue
|
|
* @return int The actually used value to initialize the table.
|
|
*
|
|
* @throws \Exception in case a sequence having this name already exists.
|
|
*/
|
|
public function create($initialValue = 0)
|
|
{
|
|
$initialValue = (int) $initialValue;
|
|
|
|
$this->db->insert($this->table, array('name' => $this->name, 'value' => $initialValue));
|
|
|
|
return $initialValue;
|
|
}
|
|
|
|
/**
|
|
* Returns true if the sequence exist.
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function exists()
|
|
{
|
|
$query = $this->db->query('SELECT * FROM ' . $this->table . ' WHERE name = ?', $this->name);
|
|
|
|
return $query->rowCount() > 0;
|
|
}
|
|
|
|
/**
|
|
* Get / allocate / reserve a new id for the current sequence. Important: Getting the next id will fail in case
|
|
* no such sequence exists. Make sure to create one if needed, see {@link create()}.
|
|
*
|
|
* @return int
|
|
* @throws Exception
|
|
*/
|
|
public function getNextId()
|
|
{
|
|
$sql = 'UPDATE ' . $this->table . ' SET value = LAST_INSERT_ID(value + 1) WHERE name = ?';
|
|
|
|
$result = $this->db->query($sql, array($this->name));
|
|
$rowCount = $result->rowCount();
|
|
|
|
if (1 !== $rowCount) {
|
|
throw new Exception("Sequence '" . $this->name . "' not found.");
|
|
}
|
|
|
|
$createdId = $this->db->lastInsertId();
|
|
|
|
return (int) $createdId;
|
|
}
|
|
|
|
/**
|
|
* Returns the current max id.
|
|
* @return int
|
|
* @internal
|
|
*/
|
|
public function getCurrentId()
|
|
{
|
|
$sql = 'SELECT value FROM ' . $this->table . ' WHERE name = ?';
|
|
|
|
$id = $this->db->fetchOne($sql, array($this->name));
|
|
|
|
if (!empty($id) || '0' === $id || 0 === $id) {
|
|
return (int) $id;
|
|
}
|
|
}
|
|
|
|
private function getTableName($prefix)
|
|
{
|
|
return ($prefix !== null) ? $prefix . self::TABLE_NAME : Common::prefixTable(self::TABLE_NAME);
|
|
}
|
|
}
|