104 lines
3.3 KiB
Python
104 lines
3.3 KiB
Python
# ------------------------------------------------------------------------------
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# aq.py (Section 14.1)
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# ------------------------------------------------------------------------------
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# ------------------------------------------------------------------------------
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# Copyright (c) 2017, 2022, Oracle and/or its affiliates.
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#
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# This software is dual-licensed to you under the Universal Permissive License
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# (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl and Apache License
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# 2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose
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# either license.
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#
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# If you elect to accept the software under the Apache License, Version 2.0,
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# the following applies:
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ------------------------------------------------------------------------------
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import oracledb
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import decimal
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import db_config_thick as db_config
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con = oracledb.connect(user=db_config.user,
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password=db_config.pw, dsn=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(f"""
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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 a type
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print("Creating books type UDT_BOOK...")
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cur.execute(f"""
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create type {BOOK_TYPE_NAME} 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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);""")
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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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books_type = con.gettype(BOOK_TYPE_NAME)
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queue = con.queue(QUEUE_NAME, books_type)
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# Enqueue a few messages
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print("Enqueuing messages...")
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BOOK_DATA = [
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("The Fellowship of the Ring", "Tolkien, J.R.R.", 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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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(con.msgproperties(payload=book))
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con.commit()
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# Dequeue the messages
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print("\nDequeuing messages...")
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queue.deqoptions.wait = oracledb.DEQ_NO_WAIT
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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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con.commit()
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print("\nDone.")
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