Using new cross-db sql_isnotempty() function. MDL-12084

diff --git a/mod/quiz/locallib.php b/mod/quiz/locallib.php
index bc7e7686a452ee1fb36970cc25ce1b8da0382610..3ad67040f5fc045285120ca7af137381bc8c1ffe 100644 (file)
--- a/mod/quiz/locallib.php
+++ b/mod/quiz/locallib.php
@@ -357,7 +357,7 @@ function quiz_has_feedback($quizid) {
     static $cache = array();
     if (!array_key_exists($quizid, $cache)) {
         $cache[$quizid] = record_exists_select('quiz_feedback',
-                "quizid = $quizid AND feedbacktext <> ''");
+                "quizid = $quizid AND " . sql_isnotempty('quiz_feedback', 'feedbacktext', false, true));
     }
     return $cache[$quizid];
 }