From 4c97487728312f90205f6ab8527ed4d1a7b1fe82 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20S=CC=8Ckoda?= <commits@skodak.org>
Date: Mon, 8 Apr 2013 10:36:37 +0200
Subject: [PATCH] MDL-39024 fix MSSQL seek past the end of recordset

---
 lib/dml/mssql_native_moodle_database.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/dml/mssql_native_moodle_database.php b/lib/dml/mssql_native_moodle_database.php
index 11045181596..6fe792980db 100644
--- a/lib/dml/mssql_native_moodle_database.php
+++ b/lib/dml/mssql_native_moodle_database.php
@@ -713,7 +713,11 @@ class mssql_native_moodle_database extends moodle_database {
         $this->query_end($result);
 
         if ($limitfrom) { // Skip $limitfrom records
-            mssql_data_seek($result, $limitfrom);
+            if (!@mssql_data_seek($result, $limitfrom)) {
+                // Nothing, most probably seek past the end.
+                mssql_free_result($result);
+                $result = null;
+            }
         }
 
         return $this->create_recordset($result);