68 lines
2.1 KiB
Python
68 lines
2.1 KiB
Python
#------------------------------------------------------------------------------
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# Copyright (c) 2016, 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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# object_aq.py
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# This script demonstrates how to use advanced queuing with objects using
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# cx_Oracle. It makes use of a simple type and queue created in the sample
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# 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 decimal
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import cx_Oracle as oracledb
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import sample_env
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BOOK_TYPE_NAME = "UDT_BOOK"
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QUEUE_NAME = "DEMO_BOOK_QUEUE"
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BOOK_DATA = [
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("The Fellowship of the Ring", "Tolkien, J.R.R.",
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decimal.Decimal("10.99")),
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("Harry Potter and the Philosopher's Stone", "Rowling, J.K.",
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decimal.Decimal("7.99"))
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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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books_type = connection.gettype(BOOK_TYPE_NAME)
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queue = connection.queue(QUEUE_NAME, payload_type=books_type)
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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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for title, authors, price in BOOK_DATA:
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book = books_type.newobject()
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book.TITLE = title
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book.AUTHORS = authors
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book.PRICE = price
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print(title)
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queue.enqone(connection.msgproperties(payload=book))
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connection.commit()
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# dequeue the messages
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print("\nDequeuing messages...")
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while True:
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props = queue.deqone()
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if not props:
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break
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print(props.payload.TITLE)
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connection.commit()
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print("\nDone.")
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