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<?php
class DbUpdater {
private $link;
private $db_type;
private $need_version;
function __construct($link, $db_type, $need_version) {
$this->link = $link;
$this->db_type = $db_type;
$this->need_version = (int) $need_version;
}
function getSchemaVersion() {
$result = db_query($this->link, "SELECT schema_version FROM ttrss_version");
return (int) db_fetch_result($result, 0, "schema_version");
}
function isUpdateRequired() {
return $this->getSchemaVersion() < $this->need_version;
}
function getSchemaLines($version) {
$filename = "schema/versions/".$this->db_type."/$version.sql";
if (file_exists($filename)) {
return explode(";", preg_replace("/[\r\n]/", "", file_get_contents($filename)));
} else {
return false;
}
}
function performUpdateTo($version) {
if ($this->getSchemaVersion() == $version - 1) {
$lines = $this->getSchemaLines($version);
if (is_array($lines)) {
db_query($this->link, "BEGIN");
foreach ($lines as $line) {
if (strpos($line, "--") !== 0 && $line) {
db_query($this->link, $line);
}
}
$db_version = $this->getSchemaVersion();
if ($db_version == $version) {
db_query($this->link, "COMMIT");
return true;
} else {
db_query($this->link, "ROLLBACK");
return false;
}
} else {
return true;
}
} else {
return false;
}
}
} ?>
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