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#------------------------------------------------------------------------------
# Copyright (c) 2016, 2022, Oracle and/or its affiliates.
#
# This software is dual-licensed to you under the Universal Permissive License
# (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl and Apache License
# 2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose
# either license.
#
# If you elect to accept the software under the Apache License, Version 2.0,
# the following applies:
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#------------------------------------------------------------------------------
#------------------------------------------------------------------------------
# generic_row_factory.py
#
# Demonstrates the ability to return named tuples for all queries using a
# subclassed cursor and row factory.
#------------------------------------------------------------------------------
import collections
import oracledb
import sample_env
# determine whether to use python-oracledb thin mode or thick mode
if not sample_env.get_is_thin():
oracledb.init_oracle_client(lib_dir=sample_env.get_oracle_client())
class Connection(oracledb.Connection):
def cursor(self):
return Cursor(self)
class Cursor(oracledb.Cursor):
def execute(self, statement, args=None):
prepare_needed = (self.statement != statement)
result = super().execute(statement, args or [])
if prepare_needed:
description = self.description
if description is not None:
names = [d[0] for d in description]
self.rowfactory = collections.namedtuple("GenericQuery", names)
return result
# create a new subclassed connection and cursor
connection = Connection(user=sample_env.get_main_user(),
password=sample_env.get_main_password(),
dsn=sample_env.get_connect_string())
with connection.cursor() as cursor:
# the names are now available directly for each query executed
for row in cursor.execute("select ParentId, Description from ParentTable"):
print(row.PARENTID, "->", row.DESCRIPTION)
print()
for row in cursor.execute("select ChildId, Description from ChildTable"):
print(row.CHILDID, "->", row.DESCRIPTION)
print()
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