- python DB code: add clear cache method, and fix equality crash

(from Jeremy Cowles)

svn path=/trunk/boinc/; revision=18258

checkin_notes

@@ -4901,3 +4901,10 @@ Charlie 1 June 2009
     clientgui/
         AsyncRPC.cpp
         browser.cpp
+
+David  1 June 2009
+	- python DB code: add clear cache method, and fix equality crash
+		(from Jeremy Cowles)
+
+	py/Boinc/
+		boinc_db.py

py/Boinc/db_base.py

@@ -246,6 +246,12 @@ class DatabaseTable:
         and not just "id")'''
         pass
 
+    def clear_cache(self):
+        """
+        Clears the cached objects list
+        """
+        self.object_cache = []
+
     def count(self, **kwargs):
         """Return the number of database objects matching keywords.
 
@@ -450,7 +456,7 @@ class DatabaseObject:
         self.do_init(kwargs)
 
     def __eq__(self, other):
-        return other!=None and self.id == other.id
+        return other!=None and isinstance(other, DatabaseObject) and self.id == other.id
     def __ne__(self, other):
         return not (self == other)
     def __hash__(self):