Fixed #24200 -- Made introspection bypass statement cache

    supports_combined_alters = False

    nulls_order_largest = True

    requires_literal_defaults = True

    connection_persists_old_columns = True

    closed_cursor_error_class = InterfaceError

    bare_select_suffix = " FROM DUAL"

    uppercases_column_names = True

    except AttributeError:

        pass

    cache_bust_counter = 1

    def get_field_type(self, data_type, description):

        # If it's a NUMBER with scale == 0, consider it an IntegerField

        if data_type == cx_Oracle.NUMBER:

    def get_table_description(self, cursor, table_name):

        "Returns a description of the table, with the DB-API cursor.description interface."

        cursor.execute("SELECT * FROM %s WHERE ROWNUM < 2" % self.connection.ops.quote_name(table_name))

        self.cache_bust_counter += 1

        cursor.execute("SELECT * FROM {} WHERE ROWNUM < 2 AND {} > 0".format(

            self.connection.ops.quote_name(table_name),

            self.cache_bust_counter))

        description = []

        for desc in cursor.description:

            name = force_text(desc[0])  # cx_Oracle always returns a 'str' on both Python 2 and 3

        self.remove_field(model, old_field)

        # Rename the new field

        self.alter_field(model, new_temp_field, new_field)

        # Close the connection to force cx_Oracle to get column types right

        # on a new cursor

        self.connection.close()

    def normalize_name(self, name):

        """

* The MySQL backend no longer creates explicit indexes for foreign keys when

  using the InnoDB storage engine, as MySQL already creates them automatically.

* The Oracle backend no longer defines the ``connection_persists_old_columns``

  feature as ``True``. Instead, Oracle will now include a cache busting clause

  when getting the description of a table.

Email

^^^^^