69 lines
2.6 KiB
Python
69 lines
2.6 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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# cqn.py
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# This script demonstrates using continuous query notification in Python, a
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# feature that is available in Oracle 11g and later. Once this script is
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# running, use another session to insert, update or delete rows from the table
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# TestTempTable and you will see the notification of that change.
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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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import time
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import cx_Oracle as oracledb
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import sample_env
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registered = True
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def callback(message):
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global registered
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print("Message type:", message.type)
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if not message.registered:
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print("Deregistration has taken place...")
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registered = False
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return
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print("Message database name:", message.dbname)
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print("Message tranasction id:", message.txid)
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print("Message queries:")
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for query in message.queries:
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print("--> Query ID:", query.id)
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print("--> Query Operation:", query.operation)
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for table in query.tables:
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print("--> --> Table Name:", table.name)
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print("--> --> Table Operation:", table.operation)
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if table.rows is not None:
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print("--> --> Table Rows:")
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for row in table.rows:
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print("--> --> --> Row RowId:", row.rowid)
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print("--> --> --> Row Operation:", row.operation)
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print("-" * 60)
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print("=" * 60)
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connection = oracledb.connect(sample_env.get_main_connect_string(),
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events=True)
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qos = oracledb.SUBSCR_QOS_QUERY | oracledb.SUBSCR_QOS_ROWIDS
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sub = connection.subscribe(callback=callback, timeout=1800, qos=qos)
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print("Subscription:", sub)
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print("--> Connection:", sub.connection)
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print("--> Callback:", sub.callback)
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print("--> Namespace:", sub.namespace)
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print("--> Protocol:", sub.protocol)
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print("--> Timeout:", sub.timeout)
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print("--> Operations:", sub.operations)
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print("--> Rowids?:", bool(sub.qos & oracledb.SUBSCR_QOS_ROWIDS))
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query_id = sub.registerquery("select * from TestTempTable")
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print("Registered query:", query_id)
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while registered:
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print("Waiting for notifications....")
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time.sleep(5)
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