app_context.py

# -----------------------------------------------------------------------------
# Copyright (c) 2016, 2023, 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.
#
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# either license.
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# the following applies:
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# Licensed under the Apache License, Version 2.0 (the "License");
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
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# -----------------------------------------------------------------------------

# -----------------------------------------------------------------------------
# app_context.py
#
# Demonstrates the use of application context. Application context is available
# within logon triggers and can be retrieved by using the function
# sys_context().
# -----------------------------------------------------------------------------

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())

# client context attributes to be set
APP_CTX_NAMESPACE = "CLIENTCONTEXT"
APP_CTX_ENTRIES = [
    (APP_CTX_NAMESPACE, "ATTR1", "VALUE1"),
    (APP_CTX_NAMESPACE, "ATTR2", "VALUE2"),
    (APP_CTX_NAMESPACE, "ATTR3", "VALUE3"),
]

connection = oracledb.connect(
    user=sample_env.get_main_user(),
    password=sample_env.get_main_password(),
    dsn=sample_env.get_connect_string(),
    appcontext=APP_CTX_ENTRIES,
)

with connection.cursor() as cursor:
    for namespace, name, value in APP_CTX_ENTRIES:
        cursor.execute(
            "select sys_context(:1, :2) from dual", (namespace, name)
        )
        (value,) = cursor.fetchone()
        print("Value of context key", name, "is", value)