Eliminated deprecation of attribute "id" on subscriptions. It is now populated

with the value of REGID found in the database view
USER_CHANGE_NOTIFICATION_REGS or the value of REG_ID found in the database
view USER_SUBSCR_REGISTRATIONS. For AQ subscriptions, the value is 0.

doc/src/subscription.rst

@@ -23,11 +23,10 @@ Subscription Object
 
 .. attribute:: Subscription.id
 
-    This read-only attribute returns the value 0.
-
-    .. deprecated:: 6.0
-        This attribute was never intended to be exposed and will be removed
-        in cx_Oracle 7.
+    This read-only attribute returns the value of ``REGID`` found in the
+    database view ``USER_CHANGE_NOTIFICATION_REGS`` or the value of ``REG_ID``
+    found in the database view ``USER_SUBSCR_REGISTRATIONS``. For AQ
+    subscriptions, the value is 0.
 
 
 .. attribute:: Subscription.ipAddress

samples/DatabaseChangeNotification.py

@@ -52,6 +52,7 @@ sub = connection.subscribe(callback = callback, timeout = 1800,
         qos = cx_Oracle.SUBSCR_QOS_ROWIDS)
 print("Subscription:", sub)
 print("--> Connection:", sub.connection)
+print("--> ID:", sub.id)
 print("--> Callback:", sub.callback)
 print("--> Namespace:", sub.namespace)
 print("--> Protocol:", sub.protocol)

src/cxoConnection.c

@@ -1786,6 +1786,7 @@ static PyObject *cxoConnection_subscribe(cxoConnection *conn, PyObject* args,
         Py_DECREF(subscr);
         return NULL;
     }
+    subscr->id = params.outRegId;
     cxoBuffer_clear(&ipAddressBuffer);
     cxoBuffer_clear(&nameBuffer);