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<?php
namespace PicoDb;
use PDOException;
/**
* Schema migration class
*
* @package PicoDb
* @author Frederic Guillot
*/
class Schema
{
/**
* Database instance
*
* @access protected
* @var Database
*/
protected $db = null;
/**
* Schema namespace
*
* @access protected
* @var string
*/
protected $namespace = '\Schema';
/**
* Constructor
*
* @access public
* @param Database $db
*/
public function __construct(Database $db)
{
$this->db = $db;
}
/**
* Set another namespace
*
* @access public
* @param string $namespace
* @return Schema
*/
public function setNamespace($namespace)
{
$this->namespace = $namespace;
return $this;
}
/**
* Get schema namespace
*
* @access public
* @return string
*/
public function getNamespace()
{
return $this->namespace;
}
/**
* Check the schema version and run the migrations
*
* @access public
* @param integer $last_version
* @return boolean
*/
public function check($last_version = 1)
{
$current_version = $this->db->getDriver()->getSchemaVersion();
if ($current_version < $last_version) {
return $this->migrateTo($current_version, $last_version);
}
return true;
}
/**
* Migrate the schema to one version to another
*
* @access public
* @param integer $current_version
* @param integer $next_version
* @return boolean
*/
public function migrateTo($current_version, $next_version)
{
try {
for ($i = $current_version + 1; $i <= $next_version; $i++) {
$this->db->startTransaction();
$this->db->getDriver()->disableForeignKeys();
$function_name = $this->getNamespace().'\version_'.$i;
if (function_exists($function_name)) {
$this->db->setLogMessage('Running migration '.$function_name);
call_user_func($function_name, $this->db->getConnection());
}
$this->db->getDriver()->setSchemaVersion($i);
$this->db->getDriver()->enableForeignKeys();
$this->db->closeTransaction();
}
} catch (PDOException $e) {
$this->db->setLogMessage($e->getMessage());
$this->db->cancelTransaction();
$this->db->getDriver()->enableForeignKeys();
return false;
}
return true;
}
}
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