65 lines
2.2 KiB
Python
65 lines
2.2 KiB
Python
#------------------------------------------------------------------------------
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# Copyright 2016, 2018, 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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# AdvancedQueuing.py
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# This script demonstrates how to use advanced queuing using cx_Oracle. It
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# makes use of a simple type and queue created in the sample setup.
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#
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# This script requires cx_Oracle 5.3 and higher.
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#------------------------------------------------------------------------------
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from __future__ import print_function
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BOOK_TYPE_NAME = "UDT_BOOK"
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QUEUE_NAME = "BOOKS"
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QUEUE_TABLE_NAME = "BOOK_QUEUE"
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import cx_Oracle
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import SampleEnv
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import decimal
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# connect to database
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connection = cx_Oracle.Connection(SampleEnv.MAIN_CONNECT_STRING)
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cursor = connection.cursor()
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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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booksType = connection.gettype(BOOK_TYPE_NAME)
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book = booksType.newobject()
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options = connection.deqoptions()
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options.wait = cx_Oracle.DEQ_NO_WAIT
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messageProperties = connection.msgproperties()
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while connection.deq(QUEUE_NAME, options, messageProperties, book):
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pass
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# enqueue a few messages
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book1 = booksType.newobject()
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book1.TITLE = "The Fellowship of the Ring"
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book1.AUTHORS = "Tolkien, J.R.R."
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book1.PRICE = decimal.Decimal("10.99")
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book2 = booksType.newobject()
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book2.TITLE = "Harry Potter and the Philosopher's Stone"
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book2.AUTHORS = "Rowling, J.K."
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book2.PRICE = decimal.Decimal("7.99")
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options = connection.enqoptions()
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for book in (book1, book2):
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print("Enqueuing book", book.TITLE)
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connection.enq(QUEUE_NAME, options, messageProperties, book)
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connection.commit()
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# dequeue the messages
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options = connection.deqoptions()
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options.navigation = cx_Oracle.DEQ_FIRST_MSG
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options.wait = cx_Oracle.DEQ_NO_WAIT
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while connection.deq(QUEUE_NAME, options, messageProperties, book):
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print("Dequeued book", book.TITLE)
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connection.commit()
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