cursors needs to be weak key

diff --git a/lib/sqlalchemy/pool.py b/lib/sqlalchemy/pool.py
index 68ab0be47b298de13f8c85cee7186df62f8293e5..d13c83cac7c8686e3bdfc46ed1cc2e7d87eff82c 100644 (file)
--- a/lib/sqlalchemy/pool.py
+++ b/lib/sqlalchemy/pool.py
@@ -187,7 +187,7 @@ class _ConnectionFairy(object):
     """proxies a DBAPI connection object and provides return-on-dereference support"""
     def __init__(self, pool):
         self._threadfairy = _ThreadFairy(self)
-        self._cursors = {}
+        self._cursors = weakref.WeakKeyDictionary()
         self.__pool = pool
         self.__counter = 0
         try: