prepare SQL query only once, that's what prepared statements are for. Should improve upgrade time with larger setups

apps/files/appinfo/update.php

@@ -5,10 +5,10 @@ $installedVersion=OCP\Config::getAppValue('files', 'installed_version');
 if (version_compare($installedVersion, '1.1.6', '<')) {
 	$query = OC_DB::prepare( "SELECT `propertyname`, `propertypath`, `userid` FROM `*PREFIX*properties`" );
 	$result = $query->execute();
+	$updateQuery = OC_DB::prepare('UPDATE `*PREFIX*properties` SET `propertyname` = ? WHERE `userid` = ? AND `propertypath` = ?');
 	while( $row = $result->fetchRow()) {
 		if ( $row["propertyname"][0] != '{' ) {
-			$query = OC_DB::prepare( 'UPDATE `*PREFIX*properties` SET `propertyname` = ? WHERE `userid` = ? AND `propertypath` = ?' );
-			$query->execute( array( '{DAV:}' + $row["propertyname"], $row["userid"], $row["propertypath"] ));
+			$updateQuery->execute(array('{DAV:}' + $row["propertyname"], $row["userid"], $row["propertypath"]));
 		}
 	}
 }