Fixed bug with detection of when a connection has been closed by the

database without notification.

Author: anthony-tuininga

doc/src/release_notes.rst

@@ -24,6 +24,8 @@ Thin Mode Changes
 #)  Fixed bug in the calculation of attribute
     :attr:`MessageProperties.deliverymode`. Previously it was being set to the
     value of the attribute :attr:`DeqOptions.deliverymode`.
+#)  Fixed bug with detection of when a connection has been closed by the
+    database without notification.
 
 Thick Mode Changes
 ++++++++++++++++++

src/oracledb/impl/thin/packet.pyx

@@ -230,7 +230,7 @@ cdef class ReadBuffer(Buffer):
             else:
                 errors._raise_err(errors.ERR_UNSUPPORTED_INBAND_NOTIFICATION,
                                   err_num=self._pending_error_num)
-        elif self._transport is None:
+        elif self._transport is None or self._transport._transport is None:
             if self._pending_error_num == TNS_ERR_SESSION_SHUTDOWN:
                 errors._raise_err(errors.ERR_CONNECTION_CLOSED)
             errors._raise_err(errors.ERR_NOT_CONNECTED)