--- loncom/interface/loncoursedata.pm	2003/10/01 21:41:47	1.81.2.1
+++ loncom/interface/loncoursedata.pm	2003/10/03 15:33:25	1.81.2.2
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: loncoursedata.pm,v 1.81.2.1 2003/10/01 21:41:47 albertel Exp $
+# $Id: loncoursedata.pm,v 1.81.2.2 2003/10/03 15:33:25 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -869,6 +869,36 @@ sub get_student {
 
 ################################################
 ################################################
+
+=pod
+
+=item &clear_internal_caches()
+
+Causes the internal caches used in get_student_id, get_student,
+get_symb_id, get_symb, get_part_id, and get_part to be undef'd.
+
+Needs to be called before the first operation with the MySQL database
+for a given Apache request.
+
+=cut
+
+################################################
+################################################
+sub clear_internal_caches {
+    $have_read_part_table = 0;
+    undef(%ids_by_part);
+    undef(%parts_by_id);
+    $have_read_symb_table = 0;
+    undef(%ids_by_symb);
+    undef(%symbs_by_id);
+    $have_read_student_table = 0;
+    undef(%ids_by_student);
+    undef(%students_by_id);
+}
+
+
+################################################
+################################################
 
 =pod