schema_version handling in backend.php

diff --git a/backend.php b/backend.php
index 611b67b38805b611a45ff33e891cf13708a9e490..2a8657474f67da6b63c5df31b4efbe8f690d2b67 100644 (file)
--- a/backend.php
+++ b/backend.php
@@ -1,4 +1,6 @@
 <?
+       define(SCHEMA_VERSION, 2);
+
        $op = $_GET["op"];
 
        if ($op == "rpc") {
@@ -25,6 +27,16 @@
        if (DB_TYPE == "pgsql") {
                pg_query("set client_encoding = 'utf-8'");
        }
+
+       $result = db_query($link, "SELECT schema_version FROM ttrss_version");
+
+       $schema_version = db_fetch_result($result, 0, "schema_version");
+
+       if ($schema_version != SCHEMA_VERSION) {
+               print "Error: database schema is invalid
+                       (got version $schema_version; expected ".SCHEMA_VERSION.")";
+               return;
+       }
        
        $fetch = $_GET["fetch"];