76 lines
2.3 KiB
Python
76 lines
2.3 KiB
Python
#------------------------------------------------------------------------------
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# Copyright (c) 2019, 2021, Oracle and/or its affiliates. All rights reserved.
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#
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# Portions Copyright 2007-2015, Anthony Tuininga. All rights reserved.
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#
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# Portions Copyright 2001-2007, Computronix (Canada) Ltd., Edmonton, Alberta,
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# Canada. All rights reserved.
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# bulk_aq.py
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# This script demonstrates how to use bulk enqueuing and dequeuing of
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# messages with advanced queuing using cx_Oracle. It makes use of a RAW queue
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# created in the sample setup.
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#
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# This script requires cx_Oracle 8.2 and higher.
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#------------------------------------------------------------------------------
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import cx_Oracle as oracledb
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import sample_env
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QUEUE_NAME = "DEMO_RAW_QUEUE"
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PAYLOAD_DATA = [
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"The first message",
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"The second message",
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"The third message",
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"The fourth message",
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"The fifth message",
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"The sixth message",
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"The seventh message",
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"The eighth message",
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"The ninth message",
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"The tenth message",
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"The eleventh message",
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"The twelfth and final message"
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]
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# connect to database
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connection = oracledb.connect(sample_env.get_main_connect_string())
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cursor = connection.cursor()
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# create queue
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queue = connection.queue(QUEUE_NAME)
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queue.deqoptions.wait = oracledb.DEQ_NO_WAIT
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queue.deqoptions.navigation = oracledb.DEQ_FIRST_MSG
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# dequeue all existing messages to ensure the queue is empty, just so that
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# the results are consistent
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while queue.deqone():
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pass
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# enqueue a few messages
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print("Enqueuing messages...")
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batch_size = 6
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data_to_enqueue = PAYLOAD_DATA
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while data_to_enqueue:
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batch_data = data_to_enqueue[:batch_size]
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data_to_enqueue = data_to_enqueue[batch_size:]
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messages = [connection.msgproperties(payload=d) for d in batch_data]
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for data in batch_data:
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print(data)
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queue.enqmany(messages)
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connection.commit()
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# dequeue the messages
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print("\nDequeuing messages...")
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batch_size = 8
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while True:
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messages = queue.deqmany(batch_size)
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if not messages:
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break
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for props in messages:
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print(props.payload.decode())
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connection.commit()
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print("\nDone.")
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