diff -r 56cd8111b7f7 -r 41300fa6a67c src/sql/kernel/qsqlcachedresult.cpp
--- a/src/sql/kernel/qsqlcachedresult.cpp	Tue Jan 26 12:42:25 2010 +0200
+++ b/src/sql/kernel/qsqlcachedresult.cpp	Tue Feb 02 00:43:10 2010 +0200
@@ -278,6 +278,11 @@
     if (d->atEnd)
         return false;
 
+    if(isForwardOnly()) {
+        d->cache.clear();
+        d->cache.resize(d->colCount);
+    }
+
     if (!gotoNext(d->cache, d->nextIndex())) {
         d->revertLast();
         d->atEnd = true;