Remove beginTransaction, commit, rollback from OC_DB

lib/private/db.php

@@ -172,27 +172,6 @@ class OC_DB {
 		return \OC::$server->getDatabaseConnection()->lastInsertId($table);
 	}
 
-	/**
-	 * Start a transaction
-	 */
-	public static function beginTransaction() {
-		return \OC::$server->getDatabaseConnection()->beginTransaction();
-	}
-
-	/**
-	 * Commit the database changes done during a transaction that is in progress
-	 */
-	public static function commit() {
-		return \OC::$server->getDatabaseConnection()->commit();
-	}
-
-	/**
-	 * Rollback the database changes done during a transaction that is in progress
-	 */
-	public static function rollback() {
-		return \OC::$server->getDatabaseConnection()->rollback();
-	}
-
 	/**
 	 * saves database schema to xml file
 	 * @param string $file name of file

lib/private/files/cache/scanner.php

@@ -336,7 +336,7 @@ class Scanner extends BasicEmitter {
 		$newChildren = $this->getNewChildren($path);
 
 		if ($this->useTransactions) {
-			\OC_DB::beginTransaction();
+			\OC::$server->getDatabaseConnection()->beginTransaction();
 		}
 		$exceptionOccurred = false;
 		foreach ($newChildren as $file) {
@@ -361,7 +361,7 @@ class Scanner extends BasicEmitter {
 				$exceptionOccurred = true;
 			} catch (\OCP\Lock\LockedException $e) {
 				if ($this->useTransactions) {
-					\OC_DB::rollback();
+					\OC::$server->getDatabaseConnection()->rollback();
 				}
 				throw $e;
 			}
@@ -372,7 +372,7 @@ class Scanner extends BasicEmitter {
 			$this->removeFromCache($child);
 		}
 		if ($this->useTransactions) {
-			\OC_DB::commit();
+			\OC::$server->getDatabaseConnection()->commit();
 		}
 		if ($exceptionOccurred) {
 			// It might happen that the parallel scan process has already