Paso 2: Comprobar la conectividad con el libro mayor - Amazon Quantum Ledger Database (Amazon QLDB)

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Paso 2: Comprobar la conectividad con el libro mayor

En este paso, verifica que puede obtener acceso a lavehicle-registrationlibro mayor en Amazon QLDB utilizando el punto final de la API de datos transaccionales.

Para probar la conectividad con el libro de contabilidad

  1. Utilice el siguiente programa (connect_to_ledger.py) para crear una conexión de sesión de datos alvehicle-registrationlibro mayor.

    3.x
    # Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. # SPDX-License-Identifier: MIT-0 # # Permission is hereby granted, free of charge, to any person obtaining a copy of this # software and associated documentation files (the "Software"), to deal in the Software # without restriction, including without limitation the rights to use, copy, modify, # merge, publish, distribute, sublicense, and/or sell copies of the Software, and to # permit persons to whom the Software is furnished to do so. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, # INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A # PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT # HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # # This code expects that you have AWS credentials setup per: # https://boto3.amazonaws.com/v1/documentation/api/latest/guide/quickstart.html from logging import basicConfig, getLogger, INFO from botocore.exceptions import ClientError from pyqldb.driver.qldb_driver import QldbDriver from pyqldbsamples.constants import Constants logger = getLogger(__name__) basicConfig(level=INFO) def create_qldb_driver(ledger_name=Constants.LEDGER_NAME, region_name=None, endpoint_url=None, boto3_session=None): """ Create a QLDB driver for executing transactions. :type ledger_name: str :param ledger_name: The QLDB ledger name. :type region_name: str :param region_name: See [1]. :type endpoint_url: str :param endpoint_url: See [1]. :type boto3_session: :py:class:`boto3.session.Session` :param boto3_session: The boto3 session to create the client with (see [1]). :rtype: :py:class:`pyqldb.driver.qldb_driver.QldbDriver` :return: A QLDB driver object. [1]: `Boto3 Session.client Reference <https://boto3.amazonaws.com/v1/documentation/api/latest/reference/core/session.html#boto3.session.Session.client>`. """ qldb_driver = QldbDriver(ledger_name=ledger_name, region_name=region_name, endpoint_url=endpoint_url, boto3_session=boto3_session) return qldb_driver def main(ledger_name=Constants.LEDGER_NAME): """ Connect to a given ledger using default settings. """ try: with create_qldb_driver(ledger_name) as driver: logger.info('Listing table names ') for table in driver.list_tables(): logger.info(table) except ClientError as ce: logger.exception('Unable to list tables.') raise ce if __name__ == '__main__': main()
    nota
    • Para ejecutar transacciones de datos en su libro mayor, debe crear un objeto controlador QLDB para conectarse a un libro mayor específico. Se trata de un objeto cliente distinto delqldb_clientobjeto que usó en el paso anterior para crear el libro mayor. Ese cliente anterior solo se utiliza para ejecutar las operaciones de la API de administración enumeradas en elReferencia de la API de Amazon QLDB.

    • Debe especificar un nombre de libro mayor al crear este objeto controlador.

    2.x
    # Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. # SPDX-License-Identifier: MIT-0 # # Permission is hereby granted, free of charge, to any person obtaining a copy of this # software and associated documentation files (the "Software"), to deal in the Software # without restriction, including without limitation the rights to use, copy, modify, # merge, publish, distribute, sublicense, and/or sell copies of the Software, and to # permit persons to whom the Software is furnished to do so. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, # INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A # PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT # HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # # This code expects that you have AWS credentials setup per: # https://boto3.amazonaws.com/v1/documentation/api/latest/guide/quickstart.html from logging import basicConfig, getLogger, INFO from botocore.exceptions import ClientError from pyqldb.driver.pooled_qldb_driver import PooledQldbDriver from pyqldbsamples.constants import Constants logger = getLogger(__name__) basicConfig(level=INFO) def create_qldb_driver(ledger_name=Constants.LEDGER_NAME, region_name=None, endpoint_url=None, boto3_session=None): """ Create a QLDB driver for creating sessions. :type ledger_name: str :param ledger_name: The QLDB ledger name. :type region_name: str :param region_name: See [1]. :type endpoint_url: str :param endpoint_url: See [1]. :type boto3_session: :py:class:`boto3.session.Session` :param boto3_session: The boto3 session to create the client with (see [1]). :rtype: :py:class:`pyqldb.driver.pooled_qldb_driver.PooledQldbDriver` :return: A pooled QLDB driver object. [1]: `Boto3 Session.client Reference <https://boto3.amazonaws.com/v1/documentation/api/latest/reference/core/session.html#boto3.session.Session.client>`. """ qldb_driver = PooledQldbDriver(ledger_name=ledger_name, region_name=region_name, endpoint_url=endpoint_url, boto3_session=boto3_session) return qldb_driver def create_qldb_session(): """ Retrieve a QLDB session object. :rtype: :py:class:`pyqldb.session.pooled_qldb_session.PooledQldbSession` :return: A pooled QLDB session object. """ qldb_session = pooled_qldb_driver.get_session() return qldb_session pooled_qldb_driver = create_qldb_driver() if __name__ == '__main__': """ Connect to a session for a given ledger using default settings. """ try: qldb_session = create_qldb_session() logger.info('Listing table names ') for table in qldb_session.list_tables(): logger.info(table) except ClientError: logger.exception('Unable to create session.')
    nota
    • Para ejecutar transacciones de datos en su libro mayor, debe crear un objeto controlador QLDB para conectarse a un libro mayor específico. Se trata de un objeto cliente distinto delqldb_clientobjeto que usó en el paso anterior para crear el libro mayor. Ese cliente anterior solo se utiliza para ejecutar las operaciones de la API de administración enumeradas en elReferencia de la API de Amazon QLDB.

    • En primer lugar, cree un objeto controlador QLDB agrupado. Debe especificar un nombre de libro mayor al crear este controlador.

    • A continuación, puede crear sesiones a partir de este objeto controlador agrupado.

  2. Para ejecutar el programa, introduzca el siguiente comando.

    python connect_to_ledger.py

Para crear tablas en elvehicle-registrationlibro de contabilidad, siga conPaso 3: Creación de tablas, índices y datos de ejemplo.