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PowerBuilder からAthena Data に接続してみた

この記事ではCData ADO.NET Provider for Athena を使ってPowerBuilder からAthena data にアクセスする方法を説明します。

CData ADO.NET providers は、PowerBuilder を含むMicrosoft .NET をサポートするあらゆるプラットフォームまたは開発テクノロジーから使用できる、使いやすい標準準拠のデータプロバイダーです。 この記事では、CData ADO.NET Provider for Athena をPowerBuilder で使う方法について説明します。

CData ADO.NET Provider for Athena を使ってデータを取得し読み書きを実行する基本的なPowerBuilder アプリケーションを作成する方法について説明します。

  1. 新規WPF Window Application ソリューションで、接続プロパティに必要なすべてのビジュアルコントロールを追加します。一般的な接続文字列は次のとおりです:

    AccessKey='a123';SecretKey='s123';Region='IRELAND';Database='sampledb';S3StagingDirectory='s3://bucket/staging/';

    Authenticating to Amazon Athena

    To authorize Amazon Athena requests, provide the credentials for an administrator account or for an IAM user with custom permissions: Set AccessKey to the access key Id. Set SecretKey to the secret access key.

    Note: Though you can connect as the AWS account administrator, it is recommended to use IAM user credentials to access AWS services.

    Obtaining the Access Key

    To obtain the credentials for an IAM user, follow the steps below:

    1. Sign into the IAM console.
    2. In the navigation pane, select Users.
    3. To create or manage the access keys for a user, select the user and then select the Security Credentials tab.

    To obtain the credentials for your AWS root account, follow the steps below:

    1. Sign into the AWS Management console with the credentials for your root account.
    2. Select your account name or number and select My Security Credentials in the menu that is displayed.
    3. Click Continue to Security Credentials and expand the Access Keys section to manage or create root account access keys.

    Authenticating from an EC2 Instance

    If you are using the CData Data Provider for Amazon Athena 2018 from an EC2 Instance and have an IAM Role assigned to the instance, you can use the IAM Role to authenticate. To do so, set UseEC2Roles to true and leave AccessKey and SecretKey empty. The CData Data Provider for Amazon Athena 2018 will automatically obtain your IAM Role credentials and authenticate with them.

    Authenticating as an AWS Role

    In many situations it may be preferable to use an IAM role for authentication instead of the direct security credentials of an AWS root user. An AWS role may be used instead by specifying the RoleARN. This will cause the CData Data Provider for Amazon Athena 2018 to attempt to retrieve credentials for the specified role. If you are connecting to AWS (instead of already being connected such as on an EC2 instance), you must additionally specify the AccessKey and SecretKey of an IAM user to assume the role for. Roles may not be used when specifying the AccessKey and SecretKey of an AWS root user.

    Authenticating with MFA

    For users and roles that require Multi-factor Authentication, specify the MFASerialNumber and MFAToken connection properties. This will cause the CData Data Provider for Amazon Athena 2018 to submit the MFA credentials in a request to retrieve temporary authentication credentials. Note that the duration of the temporary credentials may be controlled via the TemporaryTokenDuration (default 3600 seconds).

    Connecting to Amazon Athena

    In addition to the AccessKey and SecretKey properties, specify Database, S3StagingDirectory and Region. Set Region to the region where your Amazon Athena data is hosted. Set S3StagingDirectory to a folder in S3 where you would like to store the results of queries.

    If Database is not set in the connection, the data provider connects to the default database set in Amazon Athena.

  2. .NET コントロールからDataGrid コントロールを追加します。
  3. DataGrid コントロールのカラムを設定します。Account テーブルからいくつかのカラムを以下に示します: <DataGrid AutoGenerateColumns="False" Margin="13,249,12,14" Name="datagrid1" TabIndex="70" ItemsSource="{Binding}"> <DataGrid.Columns> <DataGridTextColumn x:Name="idColumn" Binding="{Binding Path=Id}" Header="Id" Width="SizeToHeader" /> <DataGridTextColumn x:Name="nameColumn" Binding="{Binding Path=Name}" Header="Name" Width="SizeToHeader" /> ... </DataGrid.Columns> </DataGrid>
  4. CData ADO.NET Provider for Athena アセンブリへの参照を追加します。

DataGrid 接続

ビジュアルエレメントが設定されたら、Connection、Command、およびDataAdapter のような標準のADO.NET オブジェクトを使ってSQL クエリの結果をDataTable に表示することができます:

System.Data.CData.AmazonAthena.AmazonAthenaConnection conn conn = create System.Data.CData.AmazonAthena.AmazonAthenaConnection(connectionString) System.Data.CData.AmazonAthena.AmazonAthenaCommand comm comm = create System.Data.CData.AmazonAthena.AmazonAthenaCommand(command, conn) System.Data.DataTable table table = create System.Data.DataTable System.Data.CData.AmazonAthena.AmazonAthenaDataAdapter dataAdapter dataAdapter = create System.Data.CData.AmazonAthena.AmazonAthenaDataAdapter(comm) dataAdapter.Fill(table) datagrid1.ItemsSource=table.DefaultView

上のコードは、指定したクエリからDataGrid にデータをバインドできます。

 
 
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