generic_row_factory_async.py

# -----------------------------------------------------------------------------
# Copyright (c) 2023, 2024, 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.
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# 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.
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#
# https://www.apache.org/licenses/LICENSE-2.0
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# 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_async.py
#
# An asynchronous version of generic_row_factory.py
#
# Demonstrates the ability to return named tuples for all queries using a
# subclassed cursor and row factory.
# -----------------------------------------------------------------------------

importasyncio
importcollections

importoracledb
importsample_env


classConnection(oracledb.AsyncConnection):
defcursor(self):
returnCursor(self)


classCursor(oracledb.AsyncCursor):
asyncdefexecute(self, statement, args=None):
prepare_needed=self.statement!=statement
result=awaitsuper().execute(statement, argsor [])
ifprepare_needed:
description=self.description
ifdescriptionisnotNone:
names= [d.namefordindescription]
self.rowfactory=collections.namedtuple("GenericQuery", names)
returnresult


asyncdefmain():
# create a new subclassed connection and cursor
connection=awaitoracledb.connect_async(
conn_class=Connection,
user=sample_env.get_main_user(),
password=sample_env.get_main_password(),
dsn=sample_env.get_connect_string(),
params=sample_env.get_connect_params(),
 )

withconnection.cursor() ascursor:
# the names are now available directly for each query executed
awaitcursor.execute("select ParentId, Description from ParentTable")
asyncforrowincursor:
print(row.PARENTID, "->", row.DESCRIPTION)
print()

awaitcursor.execute("select ChildId, Description from ChildTable")
asyncforrowincursor:
print(row.CHILDID, "->", row.DESCRIPTION)
print()


asyncio.run(main())