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Amazon DynamoDB Data をMySQL にレプリケーションするPowerShell スクリプト

PowerShell でシンプルなスクリプトを記述し、Amazon DynamoDB data をMySQL データベースにレプリケーション(複製)。

CData Cmdlets for Amazon DynamoDB をつかって、PowerShell からリアルタイムAmazon DynamoDB data に連携できます。データ同期などのタスクの連携にぴったりの製品です。 本記事では、PowerShell からCData Cmdlets for Amazon DynamoDB およびCData Cmdlets for MySQL を使って、同期スクリプトを作成して実行します。

After obtaining the needed connection properties, accessing Amazon DynamoDB data in PowerShell and preparing for replication consists of four basic steps.

Amazon DynamoDB への接続には、AccessKey、SecretKey、オプションでDomain とRegion を設定します。 AWS サービスアカウントのセキュリティクレデンシャルページでAccessKey とSecretKey を取得できます。 Region は、DynamoDB にログインしている時の左上に表示されています。

Collecting Amazon DynamoDB Data

  1. Install the module:

    Install-Module AmazonDynamoDBCmdlets
  2. Connect to Amazon DynamoDB:

    $amazondynamodb = Connect-AmazonDynamoDB -Access Key $Access Key -Secret Key $Secret Key -Domain $Domain -Region $Region
  3. Retrieve the data from a specific resource:

    $data = Select-AmazonDynamoDB -Connection $amazondynamodb -Table "Lead"

    You can also use the Invoke-AmazonDynamoDB cmdlet to execute pure SQL-92 statements:

    $data = Invoke-AmazonDynamoDB -Connection $amazondynamodb -Query 'SELECT * FROM Lead WHERE FirstName = @FirstName' -Params @{'@FirstName'='Bob'}
  4. Save a list of the column names from the returned data.

    $columns = ($data | Get-Member -MemberType NoteProperty | Select-Object -Property Name).Name

Inserting Amazon DynamoDB Data into the MySQL Database

With the data and column names collected, you are ready to replicate the data into a MySQL database.

  1. Install the module:

    Install-Module MySQLCmdlets
  2. Connect to MySQL, using the server address and port of the MySQL server, valid user credentials, and a specific database with the table in which the data will be replicated:

    $mysql = Connect-MySQL -User $User -Password $Password -Database $Database -Server $Server -Port $Port
  3. Loop through the Amazon DynamoDB data, store the values, and use the Add-MySQL cmdlet to insert the data into the MySQL database, one row at a time. In this example, the table will need to have the same name as the Amazon DynamoDB resource (Lead) and to exist in the database.

    $data | % { $row = $_ $values = @() $columns | % { $col = $_ $values += $row.$($col) } Add-MySQL -Connection $mysql -Table "Lead" -Columns $columns -Values $values }

You have now replicated your Amazon DynamoDB data to a MySQL database. This gives you freedom to work with Amazon DynamoDB data in the same way that you work with other MySQL tables, whether that is performing analytics, building reports, or other business functions.

Notes

  • Once you have connected to Amazon DynamoDB and MySQL in PowerShell, you can pipe command results to perform the replication in a single line:

    Select-AmazonDynamoDB -Connection $amazondynamodb -Table "Lead" | % { $row = $_ $values = @() $columns | % { $col = $_ $values += $row.$($col) } Add-MySQL -Connection $mysql -Table "Lead" -Columns $columns -Values $values }
  • If you wish to replicate the Amazon DynamoDB data to another database using another PowerShell module, you will want to exclude the Columns, Connection, and Table columns from the data returned by the Select-AmazonDynamoDB cmdlet since those columns are used to help pipe data from one CData cmdlet to another:

    $columns = ($data | Get-Member -MemberType NoteProperty | Select-Object -Property Name).Name | ? {$_ -NotIn @('Columns','Connection','Table')}
 
 
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