SDK for Python (Boto3) を使用した Amazon RDSの例 - AWS SDK CLI コードの例

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SDK for Python (Boto3) を使用した Amazon RDSの例

次のコード例は、Amazon AWS SDK for Python (Boto3) で を使用してアクションを実行し、一般的なシナリオを実装する方法を示していますRDS。

「基本」は、重要なオペレーションをサービス内で実行する方法を示すコード例です。

アクションはより大きなプログラムからのコードの抜粋であり、コンテキスト内で実行する必要があります。アクションは個々のサービス機能を呼び出す方法を示していますが、コンテキスト内のアクションは、関連するシナリオで確認できます。

「シナリオ」は、1 つのサービス内から、または他の AWS のサービスと組み合わせて複数の関数を呼び出し、特定のタスクを実行する方法を示すコード例です。

各例には、完全なソースコードへのリンクが含まれており、コンテキスト内でコードを設定して実行する方法の手順を確認できます。

開始方法

次のコード例は、Amazon の使用を開始する方法を示していますRDS。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。用例一覧を検索し、AWS コード例リポジトリでの設定と実行の方法を確認してください。

""" Purpose Shows how to use the AWS SDK for Python (Boto3) with the Amazon Relational Database Service (Amazon RDS) to list the databases in your account. """ import boto3 from botocore.exceptions import ClientError # Create an RDS client rds_client = boto3.client("rds") # Create a paginator for the describe_db_instances operation paginator = rds_client.get_paginator("describe_db_instances") try: # Use the paginator to get a list of DB instances response_iterator = paginator.paginate( PaginationConfig={ "MaxItems": 123, "PageSize": 50, # Adjust PageSize as needed "StartingToken": None, } ) # Iterate through the pages of the response instances_found = False for page in response_iterator: if "DBInstances" in page and page["DBInstances"]: instances_found = True print("Your RDS instances are:") for db in page["DBInstances"]: print(db["DBInstanceIdentifier"]) if not instances_found: print("No RDS instances found!") except ClientError as e: print(f"Couldn't list RDS instances. Here's why: {e.response['Error']['Message']}")
  • API 詳細については、「 for AWS SDKPython (Boto3) APIリファレンス」の「DescribeDBInstances」を参照してください。

基本

次のコードサンプルは、以下の操作方法を示しています。

  • カスタム DB パラメータグループを作成し、パラメータ値を設定します。

  • パラメータグループを使用するように設定した DB インスタンスを作成します。DB インスタンスにはデータベースも含まれています。

  • インスタンスのスナップショットを取得します。

  • インスタンスとパラメータグループを削除します。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。用例一覧を検索し、AWS コード例リポジトリでの設定と実行の方法を確認してください。

コマンドプロンプトからインタラクティブのシナリオを実行します。

class RdsInstanceScenario: """Runs a scenario that shows how to get started using Amazon RDS DB instances.""" def __init__(self, instance_wrapper): """ :param instance_wrapper: An object that wraps Amazon RDS DB instance actions. """ self.instance_wrapper = instance_wrapper def create_parameter_group(self, parameter_group_name, db_engine): """ Shows how to get available engine versions for a specified database engine and create a DB parameter group that is compatible with a selected engine family. :param parameter_group_name: The name given to the newly created parameter group. :param db_engine: The database engine to use as a basis. :return: The newly created parameter group. """ print( f"Checking for an existing DB instance parameter group named {parameter_group_name}." ) parameter_group = self.instance_wrapper.get_parameter_group( parameter_group_name ) if parameter_group is None: print(f"Getting available database engine versions for {db_engine}.") engine_versions = self.instance_wrapper.get_engine_versions(db_engine) families = list({ver["DBParameterGroupFamily"] for ver in engine_versions}) family_index = q.choose("Which family do you want to use? ", families) print(f"Creating a parameter group.") self.instance_wrapper.create_parameter_group( parameter_group_name, families[family_index], "Example parameter group." ) parameter_group = self.instance_wrapper.get_parameter_group( parameter_group_name ) print(f"Parameter group {parameter_group['DBParameterGroupName']}:") pp(parameter_group) print("-" * 88) return parameter_group def update_parameters(self, parameter_group_name): """ Shows how to get the parameters contained in a custom parameter group and update some of the parameter values in the group. :param parameter_group_name: The name of the parameter group to query and modify. """ print("Let's set some parameter values in your parameter group.") auto_inc_parameters = self.instance_wrapper.get_parameters( parameter_group_name, name_prefix="auto_increment" ) update_params = [] for auto_inc in auto_inc_parameters: if auto_inc["IsModifiable"] and auto_inc["DataType"] == "integer": print(f"The {auto_inc['ParameterName']} parameter is described as:") print(f"\t{auto_inc['Description']}") param_range = auto_inc["AllowedValues"].split("-") auto_inc["ParameterValue"] = str( q.ask( f"Enter a value between {param_range[0]} and {param_range[1]}: ", q.is_int, q.in_range(int(param_range[0]), int(param_range[1])), ) ) update_params.append(auto_inc) self.instance_wrapper.update_parameters(parameter_group_name, update_params) print( "You can get a list of parameters you've set by specifying a source of 'user'." ) user_parameters = self.instance_wrapper.get_parameters( parameter_group_name, source="user" ) pp(user_parameters) print("-" * 88) def create_instance(self, instance_name, db_name, db_engine, parameter_group): """ Shows how to create a DB instance that contains a database of a specified type and is configured to use a custom DB parameter group. :param instance_name: The name given to the newly created DB instance. :param db_name: The name given to the created database. :param db_engine: The engine of the created database. :param parameter_group: The parameter group that is associated with the DB instance. :return: The newly created DB instance. """ print("Checking for an existing DB instance.") db_inst = self.instance_wrapper.get_db_instance(instance_name) if db_inst is None: print("Let's create a DB instance.") admin_username = q.ask( "Enter an administrator user name for the database: ", q.non_empty ) admin_password = q.ask( "Enter a password for the administrator (at least 8 characters): ", q.non_empty, ) engine_versions = self.instance_wrapper.get_engine_versions( db_engine, parameter_group["DBParameterGroupFamily"] ) engine_choices = [ver["EngineVersion"] for ver in engine_versions] print("The available engines for your parameter group are:") engine_index = q.choose("Which engine do you want to use? ", engine_choices) engine_selection = engine_versions[engine_index] print( "The available micro DB instance classes for your database engine are:" ) inst_opts = self.instance_wrapper.get_orderable_instances( engine_selection["Engine"], engine_selection["EngineVersion"] ) inst_choices = list( { opt["DBInstanceClass"] for opt in inst_opts if "micro" in opt["DBInstanceClass"] } ) inst_index = q.choose( "Which micro DB instance class do you want to use? ", inst_choices ) group_name = parameter_group["DBParameterGroupName"] storage_type = "standard" allocated_storage = 5 print( f"Creating a DB instance named {instance_name} and database {db_name}.\n" f"The DB instance is configured to use your custom parameter group {group_name},\n" f"selected engine {engine_selection['EngineVersion']},\n" f"selected DB instance class {inst_choices[inst_index]}," f"and {allocated_storage} GiB of {storage_type} storage.\n" f"This typically takes several minutes." ) db_inst = self.instance_wrapper.create_db_instance( db_name, instance_name, group_name, engine_selection["Engine"], engine_selection["EngineVersion"], inst_choices[inst_index], storage_type, allocated_storage, admin_username, admin_password, ) while db_inst.get("DBInstanceStatus") != "available": wait(10) db_inst = self.instance_wrapper.get_db_instance(instance_name) print("Instance data:") pp(db_inst) print("-" * 88) return db_inst @staticmethod def display_connection(db_inst): """ Displays connection information about a DB instance and tips on how to connect to it. :param db_inst: The DB instance to display. """ print( "You can now connect to your database using your favorite MySql client.\n" "One way to connect is by using the 'mysql' shell on an Amazon EC2 instance\n" "that is running in the same VPC as your DB instance. Pass the endpoint,\n" "port, and administrator user name to 'mysql' and enter your password\n" "when prompted:\n" ) print( f"\n\tmysql -h {db_inst['Endpoint']['Address']} -P {db_inst['Endpoint']['Port']} " f"-u {db_inst['MasterUsername']} -p\n" ) print( "For more information, see the User Guide for Amazon RDS:\n" "\thttps://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_GettingStarted.CreatingConnecting.MySQL.html#CHAP_GettingStarted.Connecting.MySQL" ) print("-" * 88) def create_snapshot(self, instance_name): """ Shows how to create a DB instance snapshot and wait until it's available. :param instance_name: The name of a DB instance to snapshot. """ if q.ask( "Do you want to create a snapshot of your DB instance (y/n)? ", q.is_yesno ): snapshot_id = f"{instance_name}-{uuid.uuid4()}" print( f"Creating a snapshot named {snapshot_id}. This typically takes a few minutes." ) snapshot = self.instance_wrapper.create_snapshot(snapshot_id, instance_name) while snapshot.get("Status") != "available": wait(10) snapshot = self.instance_wrapper.get_snapshot(snapshot_id) pp(snapshot) print("-" * 88) def cleanup(self, db_inst, parameter_group_name): """ Shows how to clean up a DB instance and parameter group. Before the parameter group can be deleted, all associated DB instances must first be deleted. :param db_inst: The DB instance to delete. :param parameter_group_name: The DB parameter group to delete. """ if q.ask( "\nDo you want to delete the DB instance and parameter group (y/n)? ", q.is_yesno, ): print(f"Deleting DB instance {db_inst['DBInstanceIdentifier']}.") self.instance_wrapper.delete_db_instance(db_inst["DBInstanceIdentifier"]) print( "Waiting for the DB instance to delete. This typically takes several minutes." ) while db_inst is not None: wait(10) db_inst = self.instance_wrapper.get_db_instance( db_inst["DBInstanceIdentifier"] ) print(f"Deleting parameter group {parameter_group_name}.") self.instance_wrapper.delete_parameter_group(parameter_group_name) def run_scenario(self, db_engine, parameter_group_name, instance_name, db_name): logging.basicConfig(level=logging.INFO, format="%(levelname)s: %(message)s") print("-" * 88) print( "Welcome to the Amazon Relational Database Service (Amazon RDS)\n" "get started with DB instances demo." ) print("-" * 88) parameter_group = self.create_parameter_group(parameter_group_name, db_engine) self.update_parameters(parameter_group_name) db_inst = self.create_instance( instance_name, db_name, db_engine, parameter_group ) self.display_connection(db_inst) self.create_snapshot(instance_name) self.cleanup(db_inst, parameter_group_name) print("\nThanks for watching!") print("-" * 88) if __name__ == "__main__": try: scenario = RdsInstanceScenario(InstanceWrapper.from_client()) scenario.run_scenario( "mysql", "doc-example-parameter-group", "doc-example-instance", "docexampledb", ) except Exception: logging.exception("Something went wrong with the demo.")

Amazon RDSアクションを管理するためにシナリオによって呼び出される関数を定義します。

class InstanceWrapper: """Encapsulates Amazon RDS DB instance actions.""" def __init__(self, rds_client): """ :param rds_client: A Boto3 Amazon RDS client. """ self.rds_client = rds_client @classmethod def from_client(cls): """ Instantiates this class from a Boto3 client. """ rds_client = boto3.client("rds") return cls(rds_client) def get_parameter_group(self, parameter_group_name): """ Gets a DB parameter group. :param parameter_group_name: The name of the parameter group to retrieve. :return: The parameter group. """ try: response = self.rds_client.describe_db_parameter_groups( DBParameterGroupName=parameter_group_name ) parameter_group = response["DBParameterGroups"][0] except ClientError as err: if err.response["Error"]["Code"] == "DBParameterGroupNotFound": logger.info("Parameter group %s does not exist.", parameter_group_name) else: logger.error( "Couldn't get parameter group %s. Here's why: %s: %s", parameter_group_name, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return parameter_group def create_parameter_group( self, parameter_group_name, parameter_group_family, description ): """ Creates a DB parameter group that is based on the specified parameter group family. :param parameter_group_name: The name of the newly created parameter group. :param parameter_group_family: The family that is used as the basis of the new parameter group. :param description: A description given to the parameter group. :return: Data about the newly created parameter group. """ try: response = self.rds_client.create_db_parameter_group( DBParameterGroupName=parameter_group_name, DBParameterGroupFamily=parameter_group_family, Description=description, ) except ClientError as err: logger.error( "Couldn't create parameter group %s. Here's why: %s: %s", parameter_group_name, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return response def delete_parameter_group(self, parameter_group_name): """ Deletes a DB parameter group. :param parameter_group_name: The name of the parameter group to delete. :return: Data about the parameter group. """ try: self.rds_client.delete_db_parameter_group( DBParameterGroupName=parameter_group_name ) except ClientError as err: logger.error( "Couldn't delete parameter group %s. Here's why: %s: %s", parameter_group_name, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise def get_parameters(self, parameter_group_name, name_prefix="", source=None): """ Gets the parameters that are contained in a DB parameter group. :param parameter_group_name: The name of the parameter group to query. :param name_prefix: When specified, the retrieved list of parameters is filtered to contain only parameters that start with this prefix. :param source: When specified, only parameters from this source are retrieved. For example, a source of 'user' retrieves only parameters that were set by a user. :return: The list of requested parameters. """ try: kwargs = {"DBParameterGroupName": parameter_group_name} if source is not None: kwargs["Source"] = source parameters = [] paginator = self.rds_client.get_paginator("describe_db_parameters") for page in paginator.paginate(**kwargs): parameters += [ p for p in page["Parameters"] if p["ParameterName"].startswith(name_prefix) ] except ClientError as err: logger.error( "Couldn't get parameters for %s. Here's why: %s: %s", parameter_group_name, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return parameters def update_parameters(self, parameter_group_name, update_parameters): """ Updates parameters in a custom DB parameter group. :param parameter_group_name: The name of the parameter group to update. :param update_parameters: The parameters to update in the group. :return: Data about the modified parameter group. """ try: response = self.rds_client.modify_db_parameter_group( DBParameterGroupName=parameter_group_name, Parameters=update_parameters ) except ClientError as err: logger.error( "Couldn't update parameters in %s. Here's why: %s: %s", parameter_group_name, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return response def create_snapshot(self, snapshot_id, instance_id): """ Creates a snapshot of a DB instance. :param snapshot_id: The ID to give the created snapshot. :param instance_id: The ID of the DB instance to snapshot. :return: Data about the newly created snapshot. """ try: response = self.rds_client.create_db_snapshot( DBSnapshotIdentifier=snapshot_id, DBInstanceIdentifier=instance_id ) snapshot = response["DBSnapshot"] except ClientError as err: logger.error( "Couldn't create snapshot of %s. Here's why: %s: %s", instance_id, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return snapshot def get_snapshot(self, snapshot_id): """ Gets a DB instance snapshot. :param snapshot_id: The ID of the snapshot to retrieve. :return: The retrieved snapshot. """ try: response = self.rds_client.describe_db_snapshots( DBSnapshotIdentifier=snapshot_id ) snapshot = response["DBSnapshots"][0] except ClientError as err: logger.error( "Couldn't get snapshot %s. Here's why: %s: %s", snapshot_id, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return snapshot def get_engine_versions(self, engine, parameter_group_family=None): """ Gets database engine versions that are available for the specified engine and parameter group family. :param engine: The database engine to look up. :param parameter_group_family: When specified, restricts the returned list of engine versions to those that are compatible with this parameter group family. :return: The list of database engine versions. """ try: kwargs = {"Engine": engine} if parameter_group_family is not None: kwargs["DBParameterGroupFamily"] = parameter_group_family response = self.rds_client.describe_db_engine_versions(**kwargs) versions = response["DBEngineVersions"] except ClientError as err: logger.error( "Couldn't get engine versions for %s. Here's why: %s: %s", engine, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return versions def get_orderable_instances(self, db_engine, db_engine_version): """ Gets DB instance options that can be used to create DB instances that are compatible with a set of specifications. :param db_engine: The database engine that must be supported by the DB instance. :param db_engine_version: The engine version that must be supported by the DB instance. :return: The list of DB instance options that can be used to create a compatible DB instance. """ try: inst_opts = [] paginator = self.rds_client.get_paginator( "describe_orderable_db_instance_options" ) for page in paginator.paginate( Engine=db_engine, EngineVersion=db_engine_version ): inst_opts += page["OrderableDBInstanceOptions"] except ClientError as err: logger.error( "Couldn't get orderable DB instances. Here's why: %s: %s", err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return inst_opts def get_db_instance(self, instance_id): """ Gets data about a DB instance. :param instance_id: The ID of the DB instance to retrieve. :return: The retrieved DB instance. """ try: response = self.rds_client.describe_db_instances( DBInstanceIdentifier=instance_id ) db_inst = response["DBInstances"][0] except ClientError as err: if err.response["Error"]["Code"] == "DBInstanceNotFound": logger.info("Instance %s does not exist.", instance_id) else: logger.error( "Couldn't get DB instance %s. Here's why: %s: %s", instance_id, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return db_inst def create_db_instance( self, db_name, instance_id, parameter_group_name, db_engine, db_engine_version, instance_class, storage_type, allocated_storage, admin_name, admin_password, ): """ Creates a DB instance. :param db_name: The name of the database that is created in the DB instance. :param instance_id: The ID to give the newly created DB instance. :param parameter_group_name: A parameter group to associate with the DB instance. :param db_engine: The database engine of a database to create in the DB instance. :param db_engine_version: The engine version for the created database. :param instance_class: The DB instance class for the newly created DB instance. :param storage_type: The storage type of the DB instance. :param allocated_storage: The amount of storage allocated on the DB instance, in GiBs. :param admin_name: The name of the admin user for the created database. :param admin_password: The admin password for the created database. :return: Data about the newly created DB instance. """ try: response = self.rds_client.create_db_instance( DBName=db_name, DBInstanceIdentifier=instance_id, DBParameterGroupName=parameter_group_name, Engine=db_engine, EngineVersion=db_engine_version, DBInstanceClass=instance_class, StorageType=storage_type, AllocatedStorage=allocated_storage, MasterUsername=admin_name, MasterUserPassword=admin_password, ) db_inst = response["DBInstance"] except ClientError as err: logger.error( "Couldn't create DB instance %s. Here's why: %s: %s", instance_id, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return db_inst def delete_db_instance(self, instance_id): """ Deletes a DB instance. :param instance_id: The ID of the DB instance to delete. :return: Data about the deleted DB instance. """ try: response = self.rds_client.delete_db_instance( DBInstanceIdentifier=instance_id, SkipFinalSnapshot=True, DeleteAutomatedBackups=True, ) db_inst = response["DBInstance"] except ClientError as err: logger.error( "Couldn't delete DB instance %s. Here's why: %s: %s", instance_id, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return db_inst

アクション

次のコード例は、CreateDBInstance を使用する方法を示しています。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。用例一覧を検索し、AWS コード例リポジトリでの設定と実行の方法を確認してください。

class InstanceWrapper: """Encapsulates Amazon RDS DB instance actions.""" def __init__(self, rds_client): """ :param rds_client: A Boto3 Amazon RDS client. """ self.rds_client = rds_client @classmethod def from_client(cls): """ Instantiates this class from a Boto3 client. """ rds_client = boto3.client("rds") return cls(rds_client) def create_db_instance( self, db_name, instance_id, parameter_group_name, db_engine, db_engine_version, instance_class, storage_type, allocated_storage, admin_name, admin_password, ): """ Creates a DB instance. :param db_name: The name of the database that is created in the DB instance. :param instance_id: The ID to give the newly created DB instance. :param parameter_group_name: A parameter group to associate with the DB instance. :param db_engine: The database engine of a database to create in the DB instance. :param db_engine_version: The engine version for the created database. :param instance_class: The DB instance class for the newly created DB instance. :param storage_type: The storage type of the DB instance. :param allocated_storage: The amount of storage allocated on the DB instance, in GiBs. :param admin_name: The name of the admin user for the created database. :param admin_password: The admin password for the created database. :return: Data about the newly created DB instance. """ try: response = self.rds_client.create_db_instance( DBName=db_name, DBInstanceIdentifier=instance_id, DBParameterGroupName=parameter_group_name, Engine=db_engine, EngineVersion=db_engine_version, DBInstanceClass=instance_class, StorageType=storage_type, AllocatedStorage=allocated_storage, MasterUsername=admin_name, MasterUserPassword=admin_password, ) db_inst = response["DBInstance"] except ClientError as err: logger.error( "Couldn't create DB instance %s. Here's why: %s: %s", instance_id, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return db_inst
  • API 詳細については、「 for AWS SDKPython (Boto3) APIリファレンス」の「CreateDBInstance」を参照してください。

次の例は、CreateDBParameterGroup を使用する方法を説明しています。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。用例一覧を検索し、AWS コード例リポジトリでの設定と実行の方法を確認してください。

class InstanceWrapper: """Encapsulates Amazon RDS DB instance actions.""" def __init__(self, rds_client): """ :param rds_client: A Boto3 Amazon RDS client. """ self.rds_client = rds_client @classmethod def from_client(cls): """ Instantiates this class from a Boto3 client. """ rds_client = boto3.client("rds") return cls(rds_client) def create_parameter_group( self, parameter_group_name, parameter_group_family, description ): """ Creates a DB parameter group that is based on the specified parameter group family. :param parameter_group_name: The name of the newly created parameter group. :param parameter_group_family: The family that is used as the basis of the new parameter group. :param description: A description given to the parameter group. :return: Data about the newly created parameter group. """ try: response = self.rds_client.create_db_parameter_group( DBParameterGroupName=parameter_group_name, DBParameterGroupFamily=parameter_group_family, Description=description, ) except ClientError as err: logger.error( "Couldn't create parameter group %s. Here's why: %s: %s", parameter_group_name, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return response

次のコード例は、CreateDBSnapshot を使用する方法を示しています。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。用例一覧を検索し、AWS コード例リポジトリでの設定と実行の方法を確認してください。

class InstanceWrapper: """Encapsulates Amazon RDS DB instance actions.""" def __init__(self, rds_client): """ :param rds_client: A Boto3 Amazon RDS client. """ self.rds_client = rds_client @classmethod def from_client(cls): """ Instantiates this class from a Boto3 client. """ rds_client = boto3.client("rds") return cls(rds_client) def create_snapshot(self, snapshot_id, instance_id): """ Creates a snapshot of a DB instance. :param snapshot_id: The ID to give the created snapshot. :param instance_id: The ID of the DB instance to snapshot. :return: Data about the newly created snapshot. """ try: response = self.rds_client.create_db_snapshot( DBSnapshotIdentifier=snapshot_id, DBInstanceIdentifier=instance_id ) snapshot = response["DBSnapshot"] except ClientError as err: logger.error( "Couldn't create snapshot of %s. Here's why: %s: %s", instance_id, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return snapshot
  • API 詳細については、「 for AWS SDKPython (Boto3) APIリファレンス」の「CreateDBSnapshot」を参照してください。

次の例は、DeleteDBInstance を使用する方法を説明しています。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。用例一覧を検索し、AWS コード例リポジトリでの設定と実行の方法を確認してください。

class InstanceWrapper: """Encapsulates Amazon RDS DB instance actions.""" def __init__(self, rds_client): """ :param rds_client: A Boto3 Amazon RDS client. """ self.rds_client = rds_client @classmethod def from_client(cls): """ Instantiates this class from a Boto3 client. """ rds_client = boto3.client("rds") return cls(rds_client) def delete_db_instance(self, instance_id): """ Deletes a DB instance. :param instance_id: The ID of the DB instance to delete. :return: Data about the deleted DB instance. """ try: response = self.rds_client.delete_db_instance( DBInstanceIdentifier=instance_id, SkipFinalSnapshot=True, DeleteAutomatedBackups=True, ) db_inst = response["DBInstance"] except ClientError as err: logger.error( "Couldn't delete DB instance %s. Here's why: %s: %s", instance_id, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return db_inst
  • API 詳細については、「 for AWS SDKPython (Boto3) APIリファレンス」の「DeleteDBInstance」を参照してください。

次のコード例は、DeleteDBParameterGroup を使用する方法を示しています。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。用例一覧を検索し、AWS コード例リポジトリでの設定と実行の方法を確認してください。

class InstanceWrapper: """Encapsulates Amazon RDS DB instance actions.""" def __init__(self, rds_client): """ :param rds_client: A Boto3 Amazon RDS client. """ self.rds_client = rds_client @classmethod def from_client(cls): """ Instantiates this class from a Boto3 client. """ rds_client = boto3.client("rds") return cls(rds_client) def delete_parameter_group(self, parameter_group_name): """ Deletes a DB parameter group. :param parameter_group_name: The name of the parameter group to delete. :return: Data about the parameter group. """ try: self.rds_client.delete_db_parameter_group( DBParameterGroupName=parameter_group_name ) except ClientError as err: logger.error( "Couldn't delete parameter group %s. Here's why: %s: %s", parameter_group_name, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise

次のコード例は、DescribeDBEngineVersions を使用する方法を示しています。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。用例一覧を検索し、AWS コード例リポジトリでの設定と実行の方法を確認してください。

class InstanceWrapper: """Encapsulates Amazon RDS DB instance actions.""" def __init__(self, rds_client): """ :param rds_client: A Boto3 Amazon RDS client. """ self.rds_client = rds_client @classmethod def from_client(cls): """ Instantiates this class from a Boto3 client. """ rds_client = boto3.client("rds") return cls(rds_client) def get_engine_versions(self, engine, parameter_group_family=None): """ Gets database engine versions that are available for the specified engine and parameter group family. :param engine: The database engine to look up. :param parameter_group_family: When specified, restricts the returned list of engine versions to those that are compatible with this parameter group family. :return: The list of database engine versions. """ try: kwargs = {"Engine": engine} if parameter_group_family is not None: kwargs["DBParameterGroupFamily"] = parameter_group_family response = self.rds_client.describe_db_engine_versions(**kwargs) versions = response["DBEngineVersions"] except ClientError as err: logger.error( "Couldn't get engine versions for %s. Here's why: %s: %s", engine, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return versions

次の例は、DescribeDBInstances を使用する方法を説明しています。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。用例一覧を検索し、AWS コード例リポジトリでの設定と実行の方法を確認してください。

class InstanceWrapper: """Encapsulates Amazon RDS DB instance actions.""" def __init__(self, rds_client): """ :param rds_client: A Boto3 Amazon RDS client. """ self.rds_client = rds_client @classmethod def from_client(cls): """ Instantiates this class from a Boto3 client. """ rds_client = boto3.client("rds") return cls(rds_client) def get_db_instance(self, instance_id): """ Gets data about a DB instance. :param instance_id: The ID of the DB instance to retrieve. :return: The retrieved DB instance. """ try: response = self.rds_client.describe_db_instances( DBInstanceIdentifier=instance_id ) db_inst = response["DBInstances"][0] except ClientError as err: if err.response["Error"]["Code"] == "DBInstanceNotFound": logger.info("Instance %s does not exist.", instance_id) else: logger.error( "Couldn't get DB instance %s. Here's why: %s: %s", instance_id, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return db_inst
  • API 詳細については、「 for AWS SDKPython (Boto3) APIリファレンス」の「DescribeDBInstances」を参照してください。

次の例は、DescribeDBParameterGroups を使用する方法を説明しています。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。用例一覧を検索し、AWS コード例リポジトリでの設定と実行の方法を確認してください。

class InstanceWrapper: """Encapsulates Amazon RDS DB instance actions.""" def __init__(self, rds_client): """ :param rds_client: A Boto3 Amazon RDS client. """ self.rds_client = rds_client @classmethod def from_client(cls): """ Instantiates this class from a Boto3 client. """ rds_client = boto3.client("rds") return cls(rds_client) def get_parameter_group(self, parameter_group_name): """ Gets a DB parameter group. :param parameter_group_name: The name of the parameter group to retrieve. :return: The parameter group. """ try: response = self.rds_client.describe_db_parameter_groups( DBParameterGroupName=parameter_group_name ) parameter_group = response["DBParameterGroups"][0] except ClientError as err: if err.response["Error"]["Code"] == "DBParameterGroupNotFound": logger.info("Parameter group %s does not exist.", parameter_group_name) else: logger.error( "Couldn't get parameter group %s. Here's why: %s: %s", parameter_group_name, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return parameter_group

次のコード例は、DescribeDBParameters を使用する方法を示しています。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。用例一覧を検索し、AWS コード例リポジトリでの設定と実行の方法を確認してください。

class InstanceWrapper: """Encapsulates Amazon RDS DB instance actions.""" def __init__(self, rds_client): """ :param rds_client: A Boto3 Amazon RDS client. """ self.rds_client = rds_client @classmethod def from_client(cls): """ Instantiates this class from a Boto3 client. """ rds_client = boto3.client("rds") return cls(rds_client) def get_parameters(self, parameter_group_name, name_prefix="", source=None): """ Gets the parameters that are contained in a DB parameter group. :param parameter_group_name: The name of the parameter group to query. :param name_prefix: When specified, the retrieved list of parameters is filtered to contain only parameters that start with this prefix. :param source: When specified, only parameters from this source are retrieved. For example, a source of 'user' retrieves only parameters that were set by a user. :return: The list of requested parameters. """ try: kwargs = {"DBParameterGroupName": parameter_group_name} if source is not None: kwargs["Source"] = source parameters = [] paginator = self.rds_client.get_paginator("describe_db_parameters") for page in paginator.paginate(**kwargs): parameters += [ p for p in page["Parameters"] if p["ParameterName"].startswith(name_prefix) ] except ClientError as err: logger.error( "Couldn't get parameters for %s. Here's why: %s: %s", parameter_group_name, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return parameters
  • API 詳細については、「 for AWS SDKPython (Boto3) APIリファレンス」の「DescribeDBParameters」を参照してください。

次の例は、DescribeDBSnapshots を使用する方法を説明しています。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。用例一覧を検索し、AWS コード例リポジトリでの設定と実行の方法を確認してください。

class InstanceWrapper: """Encapsulates Amazon RDS DB instance actions.""" def __init__(self, rds_client): """ :param rds_client: A Boto3 Amazon RDS client. """ self.rds_client = rds_client @classmethod def from_client(cls): """ Instantiates this class from a Boto3 client. """ rds_client = boto3.client("rds") return cls(rds_client) def get_snapshot(self, snapshot_id): """ Gets a DB instance snapshot. :param snapshot_id: The ID of the snapshot to retrieve. :return: The retrieved snapshot. """ try: response = self.rds_client.describe_db_snapshots( DBSnapshotIdentifier=snapshot_id ) snapshot = response["DBSnapshots"][0] except ClientError as err: logger.error( "Couldn't get snapshot %s. Here's why: %s: %s", snapshot_id, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return snapshot
  • API 詳細については、「 for AWS SDKPython (Boto3) APIリファレンス」の「DescribeDBSnapshots」を参照してください。

次の例は、DescribeOrderableDBInstanceOptions を使用する方法を説明しています。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。用例一覧を検索し、AWS コード例リポジトリでの設定と実行の方法を確認してください。

class InstanceWrapper: """Encapsulates Amazon RDS DB instance actions.""" def __init__(self, rds_client): """ :param rds_client: A Boto3 Amazon RDS client. """ self.rds_client = rds_client @classmethod def from_client(cls): """ Instantiates this class from a Boto3 client. """ rds_client = boto3.client("rds") return cls(rds_client) def get_orderable_instances(self, db_engine, db_engine_version): """ Gets DB instance options that can be used to create DB instances that are compatible with a set of specifications. :param db_engine: The database engine that must be supported by the DB instance. :param db_engine_version: The engine version that must be supported by the DB instance. :return: The list of DB instance options that can be used to create a compatible DB instance. """ try: inst_opts = [] paginator = self.rds_client.get_paginator( "describe_orderable_db_instance_options" ) for page in paginator.paginate( Engine=db_engine, EngineVersion=db_engine_version ): inst_opts += page["OrderableDBInstanceOptions"] except ClientError as err: logger.error( "Couldn't get orderable DB instances. Here's why: %s: %s", err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return inst_opts

次の例は、ModifyDBParameterGroup を使用する方法を説明しています。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。用例一覧を検索し、AWS コード例リポジトリでの設定と実行の方法を確認してください。

class InstanceWrapper: """Encapsulates Amazon RDS DB instance actions.""" def __init__(self, rds_client): """ :param rds_client: A Boto3 Amazon RDS client. """ self.rds_client = rds_client @classmethod def from_client(cls): """ Instantiates this class from a Boto3 client. """ rds_client = boto3.client("rds") return cls(rds_client) def update_parameters(self, parameter_group_name, update_parameters): """ Updates parameters in a custom DB parameter group. :param parameter_group_name: The name of the parameter group to update. :param update_parameters: The parameters to update in the group. :return: Data about the modified parameter group. """ try: response = self.rds_client.modify_db_parameter_group( DBParameterGroupName=parameter_group_name, Parameters=update_parameters ) except ClientError as err: logger.error( "Couldn't update parameters in %s. Here's why: %s: %s", parameter_group_name, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: return response

シナリオ

次のコード例は、Amazon Aurora Serverless データベース内の作業項目を追跡し、Amazon Simple Email Service (Amazon SES) を使用してレポートを送信するウェブアプリケーションを作成する方法を示しています。

SDK for Python (Boto3)

を使用して AWS SDK for Python (Boto3) Amazon Aurora Serverless データベース内の作業項目を追跡し、Amazon Simple Email Service (Amazon ) を使用してレポートを E メールで送信するRESTサービスを作成する方法を示しますSES。この例では、Flask ウェブフレームワークを使用してHTTPルーティングを処理し、React ウェブページと統合して完全に機能するウェブアプリケーションを提示します。

  • と統合する Flask RESTサービスを構築します AWS のサービス。

  • Aurora Serverless データベースに保存されている作業項目の読み取り、書き込み、更新を行います。

  • データベース認証情報を含む AWS Secrets Manager シークレットを作成し、それを使用してデータベースへの呼び出しを認証します。

  • Amazon SESを使用して、作業項目の E メールレポートを送信します。

完全なソースコードと、セットアップと実行の手順については、「」の詳細な例を参照してくださいGitHub

この例で使用されているサービス
  • Aurora

  • Amazon RDS

  • Amazon RDS Data Service

  • Amazon SES

サーバーレスサンプル

次のコード例は、 RDS データベースに接続する Lambda 関数を実装する方法を示しています。この関数は、シンプルなデータベースリクエストを実行し、結果を返します。

SDK for Python (Boto3)
注記

詳細については、「」を参照してください GitHub。サーバーレスサンプルリポジトリで完全な例を検索し、設定および実行の方法を確認してください。

Python を使用して Lambda 関数の Amazon RDS データベースに接続する。

import json import os import boto3 import pymysql # RDS settings proxy_host_name = os.environ['PROXY_HOST_NAME'] port = int(os.environ['PORT']) db_name = os.environ['DB_NAME'] db_user_name = os.environ['DB_USER_NAME'] aws_region = os.environ['AWS_REGION'] # Fetch RDS Auth Token def get_auth_token(): client = boto3.client('rds') token = client.generate_db_auth_token( DBHostname=proxy_host_name, Port=port DBUsername=db_user_name Region=aws_region ) return token def lambda_handler(event, context): token = get_auth_token() try: connection = pymysql.connect( host=proxy_host_name, user=db_user_name, password=token, db=db_name, port=port, ssl={'ca': 'Amazon RDS'} # Ensure you have the CA bundle for SSL connection ) with connection.cursor() as cursor: cursor.execute('SELECT %s + %s AS sum', (3, 2)) result = cursor.fetchone() return result except Exception as e: return (f"Error: {str(e)}") # Return an error message if an exception occurs