Fixed #11706: Added an Oracle connection option to disable the use of RETURNING…

Fixed #11706: Added an Oracle connection option to disable the use of RETURNING INTO in INSERT statements.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14765 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/oracle/base.py

@@ -351,6 +351,8 @@ class DatabaseWrapper(BaseDatabaseWrapper):
 
         self.oracle_version = None
         self.features = DatabaseFeatures(self)
+        use_returning_into = self.settings_dict["OPTIONS"].get('use_returning_into', True)
+        self.features.can_return_id_from_insert = use_returning_into
         self.ops = DatabaseOperations()
         self.client = DatabaseClient(self)
         self.creation = DatabaseCreation(self)
@@ -377,7 +379,10 @@ class DatabaseWrapper(BaseDatabaseWrapper):
         cursor = None
         if not self._valid_connection():
             conn_string = convert_unicode(self._connect_string())
-            self.connection = Database.connect(conn_string, **self.settings_dict['OPTIONS'])
+            conn_params = self.settings_dict['OPTIONS'].copy()
+            if 'use_returning_into' in conn_params:
+                del conn_params['use_returning_into']
+            self.connection = Database.connect(conn_string, **conn_params)
             cursor = FormatStylePlaceholderCursor(self.connection)
             # Set oracle date to ansi date format.  This only needs to execute
             # once when we create a new connection. We also set the Territory

docs/ref/databases.txt

@@ -585,6 +585,23 @@ your Oracle database configuration to True::
 
 Failure to do this may result in crashes and other odd behavior.
 
+INSERT ... RETURNING INTO
+-------------------------
+
+By default, the Oracle backend uses a ``RETURNING INTO`` clause to efficiently
+retrieve the value of an ``AutoField`` when inserting new rows.  This behavior
+may result in a ``DatabaseError`` in certain unusual setups, such as when
+inserting into a remote table, or into a view with an ``INSTEAD OF`` trigger.
+The ``RETURNING INTO`` clause can be disabled by setting the
+``use_returning_into`` option of the database configuration to False::
+
+            'OPTIONS': {
+                'use_returning_into': False,
+            },
+
+In this case, the Oracle backend will use a separate ``SELECT`` query to
+retrieve AutoField values.
+
 Tablespace options
 ------------------