#------------------------------------------------------------------------------
# Copyright (c) 2016, 2022, Oracle and/or its affiliates.
#
# Portions Copyright 2007-2015, Anthony Tuininga. All rights reserved.
#
# Portions Copyright 2001-2007, Computronix (Canada) Ltd., Edmonton, Alberta,
# Canada. All rights reserved.
#
# This software is dual-licensed to you under the Universal Permissive License
# (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl and Apache License
# 2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose
# either license.
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# the following applies:
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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#    https://www.apache.org/licenses/LICENSE-2.0
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#------------------------------------------------------------------------------
# database_change_notification.py
#
# Demonstrates using database change notification in Python, a feature that is
# available in Oracle 10g Release 2. Once this script is running, use another
# session to insert, update or delete rows from the table TestTempTable and you
# will see the notification of that change.
#------------------------------------------------------------------------------

import time

import oracledb
import sample_env

# this script is currently only supported in python-oracledb thick mode
oracledb.init_oracle_client(lib_dir=sample_env.get_oracle_client())

registered = True

def callback(message):
    global registered
    print("Message type:", message.type)
    if not message.registered:
        print("Deregistration has taken place...")
        registered = False
        return
    print("Message database name:", message.dbname)
    print("Message tranasction id:", message.txid)
    print("Message tables:")
    for table in message.tables:
        print("--> Table Name:", table.name)
        print("--> Table Operation:", table.operation)
        if table.rows is not None:
            print("--> Table Rows:")
            for row in table.rows:
                print("--> --> Row RowId:", row.rowid)
                print("--> --> Row Operation:", row.operation)
                print("-" * 60)
        print("=" * 60)

connection = oracledb.connect(user=sample_env.get_main_user(),
                              password=sample_env.get_main_password(),
                              dsn=sample_env.get_connect_string(),
                              events=True)

sub = connection.subscribe(callback=callback, timeout=1800,
                           qos=oracledb.SUBSCR_QOS_ROWIDS, client_initiated=True)
print("Subscription:", sub)
print("--> Connection:", sub.connection)
print("--> ID:", sub.id)
print("--> Callback:", sub.callback)
print("--> Namespace:", sub.namespace)
print("--> Protocol:", sub.protocol)
print("--> Timeout:", sub.timeout)
print("--> Operations:", sub.operations)
print("--> Rowids?:", bool(sub.qos & oracledb.SUBSCR_QOS_ROWIDS))
sub.registerquery("select * from TestTempTable")

while registered:
    print("Waiting for notifications....")
    time.sleep(5)