75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
#------------------------------------------------------------------------------
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# aq.py (Section 10.1)
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
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#------------------------------------------------------------------------------
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from __future__ import print_function
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import cx_Oracle
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import decimal
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import db_config
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con = cx_Oracle.connect(db_config.user, db_config.pw, db_config.dsn)
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cur = con.cursor()
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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_TABLE"
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# Cleanup
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cur.execute(
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"""begin
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dbms_aqadm.stop_queue('""" + QUEUE_NAME + """');
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dbms_aqadm.drop_queue('""" + QUEUE_NAME + """');
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dbms_aqadm.drop_queue_table('""" + QUEUE_TABLE_NAME + """');
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execute immediate 'drop type """ + BOOK_TYPE_NAME + """';
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exception when others then
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if sqlcode <> -24010 then
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raise;
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end if;
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end;""")
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# Create type
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print("Creating books type UDT_BOOK...")
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cur.execute("""
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create type %s as object (
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title varchar2(100),
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authors varchar2(100),
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price number(5,2)
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);""" % BOOK_TYPE_NAME)
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# Create queue table and queue and start the queue
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print("Creating queue table...")
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cur.callproc("dbms_aqadm.create_queue_table",
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(QUEUE_TABLE_NAME, BOOK_TYPE_NAME))
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cur.callproc("dbms_aqadm.create_queue", (QUEUE_NAME, QUEUE_TABLE_NAME))
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cur.callproc("dbms_aqadm.start_queue", (QUEUE_NAME,))
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# Enqueue a few messages
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booksType = con.gettype(BOOK_TYPE_NAME)
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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 = con.enqoptions()
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messageProperties = con.msgproperties()
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for book in (book1, book2):
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print("Enqueuing book", book.TITLE)
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con.enq(QUEUE_NAME, options, messageProperties, book)
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con.commit()
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# Dequeue the messages
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options = con.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 con.deq(QUEUE_NAME, options, messageProperties, book):
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print("Dequeued book", book.TITLE)
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con.commit()
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