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<?php
/**
* DBSchemaVersion.php - database backed schema versions
*
* Implementation of SchemaVersion interface using a database table.
*
* @author Elmar Ludwig
* @copyright 2007 Elmar Ludwig
* @license GPL2 or any later version
* @package migrations
*/
class DBSchemaVersion implements SchemaVersion
{
/**
* domain name of schema version
*
* @var string
*/
private $domain;
/**
* branch of schema version
*
* @var string
*/
private $branch;
/**
* current schema version numbers
*
* @access private
* @var array
*/
private $versions;
/**
* Initialize a new DBSchemaVersion for a given domain.
* The default domain name is 'studip'.
*
* @param string $domain domain name (optional)
* @param string $branch schema branch (optional)
*/
public function __construct($domain = 'studip', $branch = 0)
{
$this->domain = $domain;
$this->branch = $branch;
$this->versions = [0];
$this->validateSchemaVersion();
$this->initSchemaInfo();
}
/**
* Retrieve the domain name of this schema.
*
* @return string domain name
*/
public function getDomain()
{
return $this->domain;
}
/**
* Retrieve the branch of this schema.
*
* @return string schema branch
*/
public function getBranch()
{
return $this->branch;
}
/**
* Retrieve all branches of this schema.
*
* @return array all schema branches
*/
public function getAllBranches()
{
return array_keys($this->versions);
}
/**
* Check whether the current schema_version supports branches.
*/
private function branchSupported()
{
$result = DBManager::get()->query("DESCRIBE schema_version 'branch'");
return $result && $result->rowCount() > 0;
}
/**
* Initialize the current schema versions.
*/
private function initSchemaInfo()
{
if (!$this->branchSupported()) {
$branch = $this->domain === 'studip' ? 1 : 0;
$query = "SELECT $branch, version FROM schema_version WHERE domain = ?";
} else {
$query = "SELECT branch, version FROM schema_version WHERE domain = ? ORDER BY branch";
}
$statement = DBManager::get()->prepare($query);
$statement->execute([$this->domain]);
$versions = $statement->fetchAll(PDO::FETCH_COLUMN | PDO::FETCH_GROUP | PDO::FETCH_UNIQUE);
foreach ($versions as $branch => $version) {
$this->versions[$branch] = (int) $version;
}
}
/**
* Retrieve the current schema version.
*
* @param string $branch schema branch (optional)
* @return int schema version
*/
public function get($branch = 0)
{
return $this->versions[$branch];
}
/**
* Set the current schema version.
*
* @param int $version new schema version
* @param string $branch schema branch (optional)
*/
public function set($version, $branch = 0)
{
$this->versions[$branch] = (int) $version;
if (!$this->branchSupported()) {
$query = "INSERT INTO schema_version (domain, version)
VALUES (?, ?)
ON DUPLICATE KEY UPDATE version = VALUES(version)";
$statement = DBManager::get()->prepare($query);
$statement->execute([
$this->domain,
$version
]);
} else {
$query = "INSERT INTO schema_version (domain, branch, version)
VALUES (?, ?, ?)
ON DUPLICATE KEY UPDATE version = VALUES(version)";
$statement = DBManager::get()->prepare($query);
$statement->execute([
$this->domain,
$branch,
$version
]);
}
NotificationCenter::postNotification(
'SchemaVersionDidUpdate',
$this->domain,
$version
);
}
/**
* Validate correct structure of schema_version table. This
* will upgrade the schema from 4.4 style to 5.1 if necessary.
*/
private function validateSchemaVersion()
{
$db = DBManager::get();
$result = $db->query("SHOW TABLES LIKE 'schema_versions'");
if ($result && $result->rowCount() > 0) {
$base_version = 269; // 4.4
$schema_mapping = [
20200307 => 285, // 4.5
20200522 => 290, // 4.6
20210511 => 327 // 5.0
];
foreach ($schema_mapping as $old_version => $new_version) {
$query = "SELECT 1 FROM schema_versions
WHERE domain = 'studip' AND version = ?";
$result = $db->fetchOne($query, [$old_version]);
if ($result) {
$base_version = $new_version;
}
}
$query = "CREATE TABLE schema_version (
domain VARCHAR(255) COLLATE latin1_bin NOT NULL,
branch VARCHAR(64) COLLATE latin1_bin NOT NULL DEFAULT '0',
version INT(11) UNSIGNED NOT NULL,
PRIMARY KEY (domain, branch)
) ENGINE=InnoDB ROW_FORMAT=DYNAMIC";
$db->exec($query);
$query = "INSERT INTO schema_version
SELECT domain, '0', MAX(version) FROM schema_versions
GROUP BY domain";
$db->exec($query);
$query = "DROP TABLE schema_versions";
$db->exec($query);
$query = "UPDATE schema_version SET branch = ?, version = ?
WHERE domain = 'studip'";
$db->execute($query, [1, $base_version]);
}
}
}
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