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- <?php
- class DbUpdater {
- private $dbh;
- private $db_type;
- private $need_version;
- function __construct($dbh, $db_type, $need_version) {
- $this->dbh = $dbh;
- $this->db_type = $db_type;
- $this->need_version = (int) $need_version;
- }
- function getSchemaVersion() {
- $result = db_query("SELECT schema_version FROM ttrss_version");
- return (int) db_fetch_result($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($lines)) {
- db_query("BEGIN");
- foreach ($lines as $line) {
- if (strpos($line, "--") !== 0 && $line) {
- db_query($line);
- }
- }
- $db_version = $this->getSchemaVersion();
- if ($db_version == $version) {
- db_query("COMMIT");
- return true;
- } else {
- db_query("ROLLBACK");
- return false;
- }
- } else {
- return true;
- }
- } else {
- return false;
- }
- }
- } ?>
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