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<?php
class Db_Updater {
const SCHEMA_VERSION = 142;
private $pdo;
private $db_type;
function __construct($pdo, $db_type) {
$this->pdo = $pdo;
$this->db_type = $db_type;
}
/** always returns actual (=uncached) value */
private static function get_schema_version() {
return Config::get_schema_version(true);
}
static function is_update_required() {
return self::get_schema_version() < self::SCHEMA_VERSION;
}
function get_schema_lines($version) {
$filename = "schema/versions/".$this->db_type."/$version.sql";
if (file_exists($filename)) {
return explode(";", (string)preg_replace("/[\r\n]/", "", (string)file_get_contents($filename)));
} else {
user_error("DB Updater: schema file for version $version is not found.");
return false;
}
}
function update_to($version, $html_output = true) {
if ($this->get_schema_version() == $version - 1) {
$lines = $this->get_schema_lines($version);
if (is_array($lines)) {
$this->pdo->beginTransaction();
foreach ($lines as $line) {
if (strpos($line, "--") !== 0 && $line) {
if ($html_output)
print "<pre>$line</pre>";
else
Debug::log("> $line");
try {
$this->pdo->query($line); // PDO returns errors as exceptions now
} catch (PDOException $e) {
if ($html_output) {
print "<div class='text-error'>Error: " . $e->getMessage() . "</div>";
} else {
Debug::log("Error: " . $e->getMessage());
}
$this->pdo->rollBack();
return false;
}
}
}
$db_version = self::get_schema_version();
if ($db_version == $version) {
$this->pdo->commit();
return true;
} else {
$this->pdo->rollBack();
return false;
}
} else {
return false;
}
} else {
return false;
}
}
}